Rambda is a lightweight and fast utility library that provides a variety of functions for functional programming in JavaScript. It is a smaller and faster alternative to Ramda, offering a similar API but with a focus on performance and simplicity.
Currying
Currying is a technique of evaluating functions with multiple arguments, one at a time. Rambda's `curry` function allows you to transform a function so that it can be called with fewer arguments than it expects, returning a new function that takes the remaining arguments.
const R = require('rambda');
const add = R.curry((a, b) => a + b);
const add5 = add(5);
console.log(add5(3)); // 8Composition
Function composition is the process of combining two or more functions to produce a new function. Rambda's `compose` function allows you to create a pipeline of functions that are executed from right to left.
const R = require('rambda');
const add = (a, b) => a + b;
const multiply = (a, b) => a * b;
const addAndMultiply = R.compose(R.multiply(2), R.add(3));
console.log(addAndMultiply(4)); // 14Cloning
Cloning is the process of creating a deep copy of an object. Rambda's `clone` function allows you to create a deep copy of an object, ensuring that changes to the new object do not affect the original object.
const R = require('rambda');
const obj = {a: 1, b: 2};
const clonedObj = R.clone(obj);
console.log(clonedObj); // {a: 1, b: 2}Filtering
Filtering is the process of selecting a subset of items from a collection based on a predicate function. Rambda's `filter` function allows you to filter elements in an array or object based on a provided predicate.
const R = require('rambda');
const isEven = n => n % 2 === 0;
const numbers = [1, 2, 3, 4, 5, 6];
const evenNumbers = R.filter(isEven, numbers);
console.log(evenNumbers); // [2, 4, 6]Mapping
Mapping is the process of transforming each item in a collection using a provided function. Rambda's `map` function allows you to apply a function to each element in an array or object, returning a new array or object with the transformed elements.
const R = require('rambda');
const double = n => n * 2;
const numbers = [1, 2, 3, 4, 5];
const doubledNumbers = R.map(double, numbers);
console.log(doubledNumbers); // [2, 4, 6, 8, 10]Lodash is a popular utility library that provides a wide range of functions for common programming tasks. It is more feature-rich compared to Rambda but also larger in size. Lodash focuses on performance and ease of use, offering a comprehensive set of tools for working with arrays, objects, strings, and more.
Underscore is another utility library that provides a variety of functional programming helpers. It is similar to Lodash but with a smaller footprint and fewer features. Underscore offers a core set of functions for working with collections, arrays, objects, and functions, making it a good choice for projects that need a lightweight utility library.
Ramda is a functional programming library for JavaScript that emphasizes immutability and pure functions. It offers a similar API to Rambda but with a larger set of functions and a focus on functional programming principles. Ramda is more feature-rich but also larger in size compared to Rambda.
Rambda is faster and smaller alternative to the popular functional programming library Ramda. - Documentation
import { compose, map, filter } from 'rambda'
const result = compose(
map(x => x * 2),
filter(x => x > 2)
)([1, 2, 3, 4])
// => [6, 8]
You can test this example in Rambda's REPL
Currently Rambda is more tree-shakable than Ramda
Rambda is generally more performant than Ramda as the benchmarks can prove that.
R.path and R.pathsStandard usage of R.path is R.path(['a', 'b'], {a: {b: 1} }).
In Rambda you have the choice to use dot notation(which is arguably more readable):
R.path('a.b', {a: {b: 1} })
R.pick and R.omitSimilar to dot notation, but the separator is comma(,) instead of dot(.).
R.pick('a,b', {a: 1 , b: 2, c: 3} })
// No space allowed between properties
Typescript definitions are included in the library, in comparison to Ramda, where you need to additionally install @types/ramda.
Ramda has an overwhelming list of methods, as one could get lost putting all these methods in one's head. Rambda has smaller method counts and that could be seen as advantage.
yarn add rambda
For UMD usage either use ./dist/rambda.umd.js or following CDN link:
https://unpkg.com/rambda@CURRENT_VERSION/dist/rambda.umd.js
Rambda's type detects async functions and unresolved Promises. The returned values are 'Async' and 'Promise'.
Rambda's type handles NaN input, in which case it returns NaN.
Rambda's path and paths accept dot notation - 'x.y' same as ['x','y']
Rambda's pick and omit accept comma notation - 'x,y' same as ['x','y']
Rambda's map, reject and forEach can iterate over objects not only arrays.
Rambda's map and filter pass array index as second argument when mapping over arrays.
Rambda's adjust, all, allPass, any, anyPass, findIndex , findLastIndex and reject are passing index as second argument to the predicate function.
Rambda's filter returns empty array with bad input(null or undefined), while Ramda throws.
Ramda's includes will throw an error if input is neither string nor array, while Rambda version will return false.
Ramda's clamp work for letters, while Rambda's method work only for numbers.
If you need more Ramda methods in Rambda, you may either submit a
PRor check the extended version of Rambda - Rambdax. In case of the former, you may want to consult with Rambda contribution guidelines.
There are methods which are benchmarked only with Ramda and Rambda(i.e. no Lodash).
Note that some of these methods, are called with and without curring. This is done in order to give more detailed performance feedback.
The benchmarks results are produced from latest versions of Rambda, Lodash(4.17.15) and Ramda(0.27.0).
| method | Rambda | Ramda | Lodash |
|---|---|---|---|
| add | 96.31% slower | 96.28% slower | 🚀 Fastest |
| adjust | 🚀 Fastest | 3.15% slower | 🔳 |
| all | 🚀 Fastest | 94.35% slower | 🔳 |
| allPass | 🚀 Fastest | 98.94% slower | 🔳 |
| any | 🚀 Fastest | 98.13% slower | 1.44% slower |
| anyPass | 🚀 Fastest | 99.09% slower | 🔳 |
| append | 🚀 Fastest | 82.6% slower | 🔳 |
| applySpec | 🚀 Fastest | 66.53% slower | 🔳 |
| assoc | 86.73% slower | 52.15% slower | 🚀 Fastest |
| clone | 🚀 Fastest | 82.43% slower | 62.59% slower |
| compose | 🚀 Fastest | 95.45% slower | 73.78% slower |
| converge | 44.9% slower | 🚀 Fastest | 🔳 |
| curry | 🚀 Fastest | 31.93% slower | 🔳 |
| curryN | 55.07% slower | 🚀 Fastest | 🔳 |
| defaultTo | 🚀 Fastest | 62.94% slower | 🔳 |
| drop | 🚀 Fastest | 97.08% slower | 🔳 |
| dropLast | 🚀 Fastest | 96.68% slower | 🔳 |
| equals | 76.94% slower | 78.52% slower | 🚀 Fastest |
| filter | 72.76% slower | 87.36% slower | 🚀 Fastest |
| find | 🚀 Fastest | 91.33% slower | 51.26% slower |
| findIndex | 🚀 Fastest | 97.9% slower | 76.76% slower |
| flatten | 95.68% slower | 94.49% slower | 🚀 Fastest |
| ifElse | 🚀 Fastest | 63.06% slower | 🔳 |
| includes | 🚀 Fastest | 68.05% slower | 🔳 |
| indexOf | 7.01% slower | 85.46% slower | 🚀 Fastest |
| init | 94.02% slower | 96.66% slower | 🚀 Fastest |
| is | 🚀 Fastest | 12.21% slower | 🔳 |
| isEmpty | 62.71% slower | 93.35% slower | 🚀 Fastest |
| last | 3.21% slower | 99.62% slower | 🚀 Fastest |
| lastIndexOf | 🚀 Fastest | 41.73% slower | 🔳 |
| map | 30.91% slower | 63.2% slower | 🚀 Fastest |
| match | 🚀 Fastest | 41.44% slower | 🔳 |
| merge | 62.29% slower | 🚀 Fastest | 52.15% slower |
| none | 🚀 Fastest | 87.49% slower | 🔳 |
| omit | 🚀 Fastest | 71.15% slower | 97.62% slower |
| over | 🚀 Fastest | 57.7% slower | 🔳 |
| path | 6.33% slower | 74.51% slower | 🚀 Fastest |
| pick | 🚀 Fastest | 22.61% slower | 85.66% slower |
| prop | 🚀 Fastest | 88.53% slower | 🔳 |
| propEq | 🚀 Fastest | 93.89% slower | 🔳 |
| range | 95.33% slower | 90.36% slower | 🚀 Fastest |
| reduce | 56.8% slower | 72.82% slower | 🚀 Fastest |
| repeat | 84.33% slower | 95.02% slower | 🚀 Fastest |
| replace | 1.27% slower | 31.5% slower | 🚀 Fastest |
| set | 🚀 Fastest | 47.8% slower | 🔳 |
| sort | 🚀 Fastest | 62.07% slower | 🔳 |
| sortBy | 🚀 Fastest | 59.7% slower | 87.81% slower |
| split | 🚀 Fastest | 85% slower | 32.38% slower |
| splitEvery | 🚀 Fastest | 89.27% slower | 🔳 |
| take | 92.41% slower | 97.76% slower | 🚀 Fastest |
| takeLast | 92.71% slower | 98.79% slower | 🚀 Fastest |
| test | 🚀 Fastest | 93.95% slower | 🔳 |
| type | 38.93% slower | 🚀 Fastest | 🔳 |
| uniq | 99.25% slower | 96.57% slower | 🚀 Fastest |
| update | 🚀 Fastest | 86.54% slower | 🔳 |
| view | 🚀 Fastest | 77.47% slower | 🔳 |
add(a: number, b: number): number
It adds a and b.
R.add(2, 3) // => 5
Try the above R.add example in Rambda REPL
add(a: number, b: number): number;
add(a: number): (b: number) => number;
export function add(a, b){
if (arguments.length === 1) return _b => add(a, _b)
return Number(a) + Number(b)
}
import { add } from './add'
test('with number', () => {
expect(add(2, 3)).toEqual(5)
expect(add(7)(10)).toEqual(17)
})
test('string is bad input', () => {
expect(add('foo', 'bar')).toBeNaN()
})
test('ramda specs', () => {
expect(add('1', '2')).toEqual(3)
expect(add(1, '2')).toEqual(3)
expect(add(true, false)).toEqual(1)
expect(add(null, null)).toEqual(0)
expect(add(undefined, undefined)).toEqual(NaN)
expect(add(new Date(1), new Date(2))).toEqual(3)
})
import {add} from 'rambda'
describe('add', () => {
it('number', () => {
const result = [
add(4)(1),
add(4,1)
]
result[0] // $ExpectType number
result[1] // $ExpectType number
})
})
adjust<T>(index: number, replaceFn: (a: T) => T, list: ReadonlyArray<T>): T[]
It replaces index in array list with the result of replaceFn(list[i]).
R.adjust(
0,
a => a + 1,
[0, 100]
) // => [1, 100]
Try the above R.adjust example in Rambda REPL
adjust<T>(index: number, replaceFn: (a: T) => T, list: ReadonlyArray<T>): T[];
adjust<T>(index: number, replaceFn: (a: T) => T): (list: ReadonlyArray<T>) => T[];
import { curry } from './curry'
function adjustFn(
index, replaceFn, list
){
const actualIndex = index < 0 ? list.length + index : index
if (index >= list.length || actualIndex < 0) return list
const clone = list.slice()
clone[ actualIndex ] = replaceFn(clone[ actualIndex ])
return clone
}
export const adjust = curry(adjustFn)
import { add } from './add'
import { adjust } from './adjust'
const expected = [ 0, 11, 2 ]
test('without curring', () => {
expect(adjust(
1, add(10), [ 0, 1, 2 ]
)).toEqual(expected)
})
test('with curring type 1 1 1', () => {
expect(adjust(1)(add(10))([ 0, 1, 2 ])).toEqual(expected)
})
test('with curring type 1 2', () => {
expect(adjust(1)(add(10), [ 0, 1, 2 ])).toEqual(expected)
})
test('with curring type 2 1', () => {
expect(adjust(1, add(10))([ 0, 1, 2 ])).toEqual(expected)
})
test('with negative index', () => {
expect(adjust(
-2, add(10), [ 0, 1, 2 ]
)).toEqual(expected)
})
test('when index is out of bounds', () => {
const list = [ 0, 1, 2, 3 ]
expect(adjust(
4, add(1), list
)).toEqual(list)
expect(adjust(
-5, add(1), list
)).toEqual(list)
})
Reason for the failure: ramda accepts an array-like object
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('adjust', function() {
it('accepts an array-like object', function() {
function args() {
return arguments;
}
eq(R.adjust(2, R.add(1), args(0, 1, 2, 3)), [0, 1, 3, 3]);
});
});
all<T>(predicate: (x: T) => boolean, list: ReadonlyArray<T>): boolean
It returns true, if all members of array list returns true, when applied as argument to predicate function.
const list = [ 0, 1, 2, 3, 4 ]
const predicate = x => x > -1
const result = R.all(predicate, arr)
// => true
Try the above R.all example in Rambda REPL
all<T>(predicate: (x: T) => boolean, list: ReadonlyArray<T>): boolean;
all<T>(predicate: (x: T) => boolean): (list: ReadonlyArray<T>) => boolean;
export function all(predicate, list){
if (arguments.length === 1) return _list => all(predicate, _list)
for (let i = 0; i < list.length; i++){
if (!predicate(list[ i ], i)) return false
}
return true
}
import { all } from './all'
const numArr = [ 0, 1, 2, 3, 4 ]
test('when true', () => {
const fn = x => x > -1
expect(all(fn)(numArr)).toBeTrue()
})
test('when false', () => {
const fn = x => x > 2
expect(all(fn, numArr)).toBeFalse()
})
test('pass index as second argument', () => {
const indexes = []
const fn = (x, i) => {
indexes.push(i)
return x > 5
}
all(fn, [ 10, 12, 14 ])
expect(indexes).toEqual([ 0, 1, 2 ])
})
import {all} from 'rambda'
describe('all', () => {
it('happy', () => {
const x = all<number>(y => {
y // $ExpectType number
return y > 0
})([1, 2, 3])
x // $ExpectType boolean
const q = all(y => y > 0, [1, 2, 3]) // $ExpectType boolean
q // $ExpectType boolean
})
})
allPass<T>(predicates: ((x: T) => boolean)[]): (input: T) => boolean
It returns true, if all functions of predicates return true, when input is their argument.
const input = {
a : 1,
b : 2,
}
const predicates = [
x => x.a === 1,
x => x.b === 2,
]
const result = R.allPass(predicates)(input) // => true
Try the above R.allPass example in Rambda REPL
allPass<T>(predicates: ((x: T) => boolean)[]): (input: T) => boolean;
export function allPass(predicates){
return input => {
let counter = 0
while (counter < predicates.length){
if (!predicates[ counter ](input)){
return false
}
counter++
}
return true
}
}
import { allPass } from './allPass'
test('happy', () => {
const rules = [ x => typeof x === 'number', x => x > 10, x => x * 7 < 100 ]
expect(allPass(rules)(11)).toBeTrue()
expect(allPass(rules)(undefined)).toBeFalse()
})
test('when returns true', () => {
const conditionArr = [ val => val.a === 1, val => val.b === 2 ]
expect(allPass(conditionArr)({
a : 1,
b : 2,
})).toBeTrue()
})
test('when returns false', () => {
const conditionArr = [ val => val.a === 1, val => val.b === 3 ]
expect(allPass(conditionArr)({
a : 1,
b : 2,
})).toBeFalse()
})
import {allPass} from 'rambda'
describe('allPass', () => {
it('happy', () => {
const x = allPass<number>([
y => {
y // $ExpectType number
return typeof y === 'number'
},
y => {
return y > 0
},
])(11)
x // $ExpectType boolean
})
})
Reason for the failure: ramda returns a curried function whose arity matches that of the highest-arity predicate
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('allPass', function() {
var odd = function(n) { return n % 2 !== 0; };
var lt20 = function(n) { return n < 20; };
var gt5 = function(n) { return n > 5; };
var plusEq = function(w, x, y, z) { return w + x === y + z; };
it('returns a curried function whose arity matches that of the highest-arity predicate', function() {
eq(R.allPass([odd, gt5, plusEq]).length, 4);
eq(R.allPass([odd, gt5, plusEq])(9, 9, 9, 9), true);
eq(R.allPass([odd, gt5, plusEq])(9)(9)(9)(9), true);
});
});
always<T>(x: T): () => T
It returns function that always returns x.
const fn = R.always(7)
console.log(fn())// => 7
Try the above R.always example in Rambda REPL
always<T>(x: T): () => T;
export function always(x){
return () => x
}
import { always } from './always'
test('happy', () => {
const fn = always(7)
expect(fn()).toEqual(7)
expect(fn()).toEqual(7)
})
and<T extends { and?: ((...a: readonly any[]) => any)
Returns true if both arguments are true. Otherwise, it returns false.
R.and(true, true); // => true
R.and(false, true); // => false
Try the above R.and example in Rambda REPL
and<T extends { and?: ((...a: readonly any[]) => any); } | number | boolean | string | null>(fn1: T, val2: any): boolean;
and<T extends { and?: ((...a: readonly any[]) => any); } | number | boolean | string | null>(fn1: T): (val2: any) => boolean;
export function and(a, b){
if (arguments.length === 1) return _b => and(a, _b)
return a && b
}
import { and } from './and'
test('happy', () => {
expect(and(true, true)).toBe(true)
expect(and(true, false)).toBe(false)
expect(and(false, true)).toBe(false)
expect(and(false, false)).toBe(false)
})
any<T>(predicate: (x: T, i: number) => boolean, list: ReadonlyArray<T>): boolean
It returns true, if at least one member of list returns true, when passed to predicate function.
const list = [1, 2, 3]
const predicate = x => x * x > 8
R.any(fn, list)
// => true
Try the above R.any example in Rambda REPL
any<T>(predicate: (x: T, i: number) => boolean, list: ReadonlyArray<T>): boolean;
any<T>(predicate: (x: T) => boolean, list: ReadonlyArray<T>): boolean;
any<T>(predicate: (x: T, i: number) => boolean): (list: ReadonlyArray<T>) => boolean;
any<T>(predicate: (x: T) => boolean): (list: ReadonlyArray<T>) => boolean;
export function any(predicate, list){
if (arguments.length === 1) return _list => any(predicate, _list)
let counter = 0
while (counter < list.length){
if (predicate(list[ counter ], counter)){
return true
}
counter++
}
return false
}
import { any } from './any'
const arr = [ 1, 2 ]
test('no curry', () => {
expect(any(val => val < 0, arr)).toBeFalse()
})
test('with curry', () => {
expect(any(val => val < 2)(arr)).toBeTrue()
})
test('passes index to predicate', () => {
any((x, i) => {
expect(typeof x).toBe('string')
expect(typeof i).toBe('number')
})([ 'foo', 'bar' ])
})
import {any} from 'rambda'
describe('any', () => {
it('1', () => {
const x = any<number>(
(y, i) => {
y // $ExpectType number
i // $ExpectType number
return y > 2
},
[1, 2, 3]
)
x // $ExpectType boolean
})
it('2', () => {
const x = any<number>(
y => {
y // $ExpectType number
return y > 2
},
[1, 2, 3]
)
x // $ExpectType boolean
})
it('1 curry', () => {
const x = any<number>((y, i) => {
y // $ExpectType number
i // $ExpectType number
return y > 2
})([1, 2, 3])
x // $ExpectType boolean
})
it('2 curry', () => {
const x = any<number>(y => {
y // $ExpectType number
return y > 2
})([1, 2, 3])
x // $ExpectType boolean
})
})
anyPass<T>(predicates: ReadonlyArray<SafePred<T>>): SafePred<T>
It accepts list of predicates and returns a function. This function with its input will return true, if any of predicates returns true for this input.
const isBig = x => x > 20
const isOdd = x => x % 2 === 1
const input = 11
const fn = R.anyPass(
[isBig, isOdd]
)
const result = fn(input)
// => true
Try the above R.anyPass example in Rambda REPL
anyPass<T>(predicates: ReadonlyArray<SafePred<T>>): SafePred<T>;
export function anyPass(predicates){
return input => {
let counter = 0
while (counter < predicates.length){
if (predicates[ counter ](input)){
return true
}
counter++
}
return false
}
}
import { anyPass } from './anyPass'
test('happy', () => {
const rules = [ x => typeof x === 'string', x => x > 10 ]
const predicate = anyPass(rules)
expect(predicate('foo')).toBeTrue()
expect(predicate(6)).toBeFalse()
})
test('happy', () => {
const rules = [ x => typeof x === 'string', x => x > 10 ]
expect(anyPass(rules)(11)).toBeTrue()
expect(anyPass(rules)(undefined)).toBeFalse()
})
const obj = {
a : 1,
b : 2,
}
test('when returns true', () => {
const conditionArr = [ val => val.a === 1, val => val.a === 2 ]
expect(anyPass(conditionArr)(obj)).toBeTrue()
})
test('when returns false + curry', () => {
const conditionArr = [ val => val.a === 2, val => val.b === 3 ]
expect(anyPass(conditionArr)(obj)).toBeFalse()
})
test('happy', () => {
expect(anyPass([])(3)).toEqual(false)
})
import {anyPass} from 'rambda'
describe('anyPass', () => {
it('happy', () => {
const x = anyPass<number>([
y => {
y // $ExpectType number
return typeof y === 'number'
},
y => {
return y > 0
},
])(11)
x // $ExpectType boolean
})
})
Reason for the failure: ramda returns a curried function whose arity matches that of the highest-arity predicate
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('anyPass', function() {
var odd = function(n) { return n % 2 !== 0; };
var gt20 = function(n) { return n > 20; };
var lt5 = function(n) { return n < 5; };
var plusEq = function(w, x, y, z) { return w + x === y + z; };
it('returns a curried function whose arity matches that of the highest-arity predicate', function() {
eq(R.anyPass([odd, lt5, plusEq]).length, 4);
eq(R.anyPass([odd, lt5, plusEq])(6, 7, 8, 9), false);
eq(R.anyPass([odd, lt5, plusEq])(6)(7)(8)(9), false);
});
});
append<T>(x: T, listOrString: ReadonlyArray<T>): T[]
It adds element x at the end of listOrString.
const x = 'foo'
const result = [
R.append(x, 'cherry_'),
R.append(x, ['bar', 'baz'])
]
// => ['cherry_foo', ['bar', 'baz', 'foo']]
Try the above R.append example in Rambda REPL
append<T>(x: T, listOrString: ReadonlyArray<T>): T[];
append<T>(x: T): <T>(listOrString: ReadonlyArray<T>) => T[];
export function append(x, listOrString){
if (arguments.length === 1)
return _listOrString => append(x, _listOrString)
if (typeof listOrString === 'string') return `${ listOrString }${ x }`
const clone = listOrString.slice()
clone.push(x)
return clone
}
import { append } from './append'
import { compose } from './compose.js'
import { flatten } from './flatten.js'
import { map } from './map'
test('with strings', () => {
expect(append('o', 'fo')).toEqual('foo')
})
test('with arrays', () => {
expect(append('tests', [ 'write', 'more' ])).toEqual([
'write',
'more',
'tests',
])
})
test('append to empty array', () => {
expect(append('tests', [])).toEqual([ 'tests' ])
})
test('happy', () => {
const result = compose(flatten, map(append(0)))([ [ 1 ], [ 2 ], [ 3 ] ])
expect(result).toEqual([ 1, 0, 2, 0, 3, 0 ])
})
test('should not modify arguments', () => {
const a = [ 1, 2, 3 ]
const b = append(4, a)
expect(a).toEqual([ 1, 2, 3 ])
expect(b).toEqual([ 1, 2, 3, 4 ])
})
applySpec<Spec extends Record<string, (...args: readonly any[]) => any>>(
spec: Spec
): (
...args: Parameters<ValueOfRecord<Spec>>
) => { [Key in keyof Spec]: ReturnType<Spec[Key]> }
It returns a curried function with the same arity as the longest function in the spec object. Arguments will be applied to the spec methods recursively.
const spec = {
name: R.path('deeply.nested.firstname')
}
const json = {
deeply: {
nested: {
firstname: 'barry'
}
}
}
const result = R.applySpec(spec, json) // => { name: 'barry' }
// Second example
const getMetrics = R.applySpec({
sum: R.add,
nested: { mul: R.multiply }
});
getMetrics(2, 4); // => { sum: 6, nested: { mul: 8 } }
Try the above R.applySpec example in Rambda REPL
applySpec<Spec extends Record<string, (...args: readonly any[]) => any>>(
spec: Spec
): (
...args: Parameters<ValueOfRecord<Spec>>
) => { [Key in keyof Spec]: ReturnType<Spec[Key]> };
applySpec<T>(spec: any): (...args: readonly any[]) => T;
// recursively traverse the given spec object to find the highest arity function
function __findHighestArity(spec, max = 0){
for (const key in spec){
if (spec.hasOwnProperty(key) === false || key === 'constructor') continue
if (typeof spec[ key ] === 'object'){
max = Math.max(max, __findHighestArity(spec[ key ]))
}
if (typeof spec[ key ] === 'function'){
max = Math.max(max, spec[ key ].length)
}
}
return max
}
function __filterUndefined(){
const defined = []
let i = 0
const l = arguments.length
while (i < l){
if (typeof arguments[ i ] === 'undefined') break
defined[ i ] = arguments[ i ]
i++
}
return defined
}
function __applySpecWithArity(
spec, arity, cache
){
const remaining = arity - cache.length
if (remaining === 1)
return x =>
__applySpecWithArity(
spec, arity, __filterUndefined(...cache, x)
)
if (remaining === 2)
return (x, y) =>
__applySpecWithArity(
spec, arity, __filterUndefined(
...cache, x, y
)
)
if (remaining === 3)
return (
x, y, z
) =>
__applySpecWithArity(
spec, arity, __filterUndefined(
...cache, x, y, z
)
)
if (remaining === 4)
return (
x, y, z, a
) =>
__applySpecWithArity(
spec,
arity,
__filterUndefined(
...cache, x, y, z, a
)
)
if (remaining > 4)
return (...args) =>
__applySpecWithArity(
spec, arity, __filterUndefined(...cache, ...args)
)
// handle spec as Array
if (Array.isArray(spec)){
const ret = []
let i = 0
const l = spec.length
for (; i < l; i++){
// handle recursive spec inside array
if (typeof spec[ i ] === 'object' || Array.isArray(spec[ i ])){
ret[ i ] = __applySpecWithArity(
spec[ i ], arity, cache
)
}
// apply spec to the key
if (typeof spec[ i ] === 'function'){
ret[ i ] = spec[ i ](...cache)
}
}
return ret
}
// handle spec as Object
const ret = {}
// apply callbacks to each property in the spec object
for (const key in spec){
if (spec.hasOwnProperty(key) === false || key === 'constructor') continue
// apply the spec recursively
if (typeof spec[ key ] === 'object'){
ret[ key ] = __applySpecWithArity(
spec[ key ], arity, cache
)
continue
}
// apply spec to the key
if (typeof spec[ key ] === 'function'){
ret[ key ] = spec[ key ](...cache)
}
}
return ret
}
export function applySpec(spec, ...args){
// get the highest arity spec function, cache the result and pass to __applySpecWithArity
const arity = __findHighestArity(spec)
if (arity === 0){
return () => ({})
}
const toReturn = __applySpecWithArity(
spec, arity, args
)
return toReturn
}
import { applySpec as applySpecRamda, nAry } from 'ramda'
import { add, always, compose, dec, inc, map, path, prop, T } from '../rambda'
import { applySpec } from './applySpec'
test('different than Ramda when bad spec', () => {
const result = applySpec({ sum : { a : 1 } })(1, 2)
const ramdaResult = applySpecRamda({ sum : { a : 1 } })(1, 2)
expect(result).toEqual({})
expect(ramdaResult).toEqual({ sum : { a : {} } })
})
test('works with empty spec', () => {
expect(applySpec({})()).toEqual({})
expect(applySpec([])(1, 2)).toEqual({})
expect(applySpec(null)(1, 2)).toEqual({})
})
test('works with unary functions', () => {
const result = applySpec({
v : inc,
u : dec,
})(1)
const expected = {
v : 2,
u : 0,
}
expect(result).toEqual(expected)
})
test('works with binary functions', () => {
const result = applySpec({ sum : add })(1, 2)
expect(result).toEqual({ sum : 3 })
})
test('works with nested specs', () => {
const result = applySpec({
unnested : always(0),
nested : { sum : add },
})(1, 2)
const expected = {
unnested : 0,
nested : { sum : 3 },
}
expect(result).toEqual(expected)
})
test('works with arrays of nested specs', () => {
const result = applySpec({
unnested : always(0),
nested : [ { sum : add } ],
})(1, 2)
expect(result).toEqual({
unnested : 0,
nested : [ { sum : 3 } ],
})
})
test('works with arrays of spec objects', () => {
const result = applySpec([ { sum : add } ])(1, 2)
expect(result).toEqual([ { sum : 3 } ])
})
test('works with arrays of functions', () => {
const result = applySpec([ map(prop('a')), map(prop('b')) ])([
{
a : 'a1',
b : 'b1',
},
{
a : 'a2',
b : 'b2',
},
])
const expected = [
[ 'a1', 'a2' ],
[ 'b1', 'b2' ],
]
expect(result).toEqual(expected)
})
test('works with a spec defining a map key', () => {
expect(applySpec({ map : prop('a') })({ a : 1 })).toEqual({ map : 1 })
})
test.skip('retains the highest arity', () => {
const f = applySpec({
f1 : nAry(2, T),
f2 : nAry(5, T),
})
expect(f.length).toBe(5)
})
test('returns a curried function', () => {
expect(applySpec({ sum : add })(1)(2)).toEqual({ sum : 3 })
})
// Additional tests
// ============================================
test('arity', () => {
const spec = {
one : x1 => x1,
two : (x1, x2) => x1 + x2,
three : (
x1, x2, x3
) => x1 + x2 + x3,
}
expect(applySpec(
spec, 1, 2, 3
)).toEqual({
one : 1,
two : 3,
three : 6,
})
})
test('arity over 5 arguments', () => {
const spec = {
one : x1 => x1,
two : (x1, x2) => x1 + x2,
three : (
x1, x2, x3
) => x1 + x2 + x3,
four : (
x1, x2, x3, x4
) => x1 + x2 + x3 + x4,
five : (
x1, x2, x3, x4, x5
) => x1 + x2 + x3 + x4 + x5,
}
expect(applySpec(
spec, 1, 2, 3, 4, 5
)).toEqual({
one : 1,
two : 3,
three : 6,
four : 10,
five : 15,
})
})
test('curried', () => {
const spec = {
one : x1 => x1,
two : (x1, x2) => x1 + x2,
three : (
x1, x2, x3
) => x1 + x2 + x3,
}
expect(applySpec(spec)(1)(2)(3)).toEqual({
one : 1,
two : 3,
three : 6,
})
})
test('curried over 5 arguments', () => {
const spec = {
one : x1 => x1,
two : (x1, x2) => x1 + x2,
three : (
x1, x2, x3
) => x1 + x2 + x3,
four : (
x1, x2, x3, x4
) => x1 + x2 + x3 + x4,
five : (
x1, x2, x3, x4, x5
) => x1 + x2 + x3 + x4 + x5,
}
expect(applySpec(spec)(1)(2)(3)(4)(5)).toEqual({
one : 1,
two : 3,
three : 6,
four : 10,
five : 15,
})
})
test('undefined property', () => {
const spec = { prop : path([ 'property', 'doesnt', 'exist' ]) }
expect(applySpec(spec, {})).toEqual({ prop : undefined })
})
test('restructure json object', () => {
const spec = {
id : path('user.id'),
name : path('user.firstname'),
profile : path('user.profile'),
doesntExist : path('user.profile.doesntExist'),
info : { views : compose(inc, prop('views')) },
type : always('playa'),
}
const data = {
user : {
id : 1337,
firstname : 'john',
lastname : 'shaft',
profile : 'shaft69',
},
views : 42,
}
expect(applySpec(spec, data)).toEqual({
id : 1337,
name : 'john',
profile : 'shaft69',
doesntExist : undefined,
info : { views : 43 },
type : 'playa',
})
})
import {multiply, applySpec, inc, dec, add} from 'rambda'
describe('applySpec', () => {
it('ramda 1', () => {
const result = applySpec({
v: inc,
u: dec,
})(1)
result // $ExpectType { v: number; u: number; }
})
it('ramda 1', () => {
interface Output {
sum: number,
multiplied: number,
}
const result = applySpec<Output>({
sum: add,
multiplied: multiply,
})(1, 2)
result // $ExpectType Output
})
})
assoc<T, U, K extends string>(prop: K, newValue: T, obj: U): Record<K, T> & U
It makes a shallow clone of obj with setting or overriding the property prop with newValue.
R.assoc('c', 3, {a: 1, b: 2})
//=> {a: 1, b: 2, c: 3}
Try the above R.assoc example in Rambda REPL
assoc<T, U, K extends string>(prop: K, newValue: T, obj: U): Record<K, T> & U;
assoc<T, K extends string>(prop: K, newValue: T): <U>(obj: U) => Record<K, T> & U;
assoc<K extends string>(prop: K): <T, U>(newValue: T, obj: U) => Record<K, T> & U;
import { curry } from './curry'
function assocFn(
prop, newValue, obj
){
return Object.assign(
{}, obj, { [ prop ] : newValue }
)
}
export const assoc = curry(assocFn)
import { assoc } from './assoc'
test('adds a key to an empty object', () => {
expect(assoc(
'a', 1, {}
)).toEqual({ a : 1 })
})
test('adds a key to a non-empty object', () => {
expect(assoc(
'b', 2, { a : 1 }
)).toEqual({
a : 1,
b : 2,
})
})
test('adds a key to a non-empty object - curry case 1', () => {
expect(assoc('b', 2)({ a : 1 })).toEqual({
a : 1,
b : 2,
})
})
test('adds a key to a non-empty object - curry case 2', () => {
expect(assoc('b')(2, { a : 1 })).toEqual({
a : 1,
b : 2,
})
})
test('adds a key to a non-empty object - curry case 3', () => {
const result = assoc('b')(2)({ a : 1 })
expect(result).toEqual({
a : 1,
b : 2,
})
})
test('changes an existing key', () => {
expect(assoc(
'a', 2, { a : 1 }
)).toEqual({ a : 2 })
})
test('undefined is considered an empty object', () => {
expect(assoc(
'a', 1, undefined
)).toEqual({ a : 1 })
})
test('null is considered an empty object', () => {
expect(assoc(
'a', 1, null
)).toEqual({ a : 1 })
})
test('value can be null', () => {
expect(assoc(
'a', null, null
)).toEqual({ a : null })
})
test('value can be undefined', () => {
expect(assoc(
'a', undefined, null
)).toEqual({ a : undefined })
})
test('assignment is shallow', () => {
expect(assoc(
'a', { b : 2 }, { a : { c : 3 } }
)).toEqual({ a : { b : 2 } })
})
assocPath<T, U>(path: Path, newValue: T, obj: U): U
It makes a shallow clone of obj with setting or overriding with newValue the property found with path.
const path = 'b.c'
const newValue = 2
const obj = { a: 1 }
R.assocPath(path, newValue, obj)
// => { a : 1, b : { c : 2 }}
Try the above R.assocPath example in Rambda REPL
assocPath<T, U>(path: Path, newValue: T, obj: U): U;
assocPath<T, U>(path: Path, newValue: T): (obj: U) => U;
assocPath<T, U>(path: Path): FToolbelt.Curry<(a: T, b: U) => U>;
import { _isInteger } from './_internals/_isInteger'
import { assoc } from './assoc'
import { curry } from './curry'
function assocPathFn(
list, newValue, input
){
const pathArrValue = typeof list === 'string' ? list.split('.') : list
if (pathArrValue.length === 0){
return newValue
}
const index = pathArrValue[ 0 ]
if (pathArrValue.length > 1){
const condition =
typeof input !== 'object' ||
input === null ||
!input.hasOwnProperty(index)
const nextinput = condition ?
_isInteger(parseInt(pathArrValue[ 1 ], 10)) ?
[] :
{} :
input[ index ]
newValue = assocPathFn(
Array.prototype.slice.call(pathArrValue, 1),
newValue,
nextinput
)
}
if (_isInteger(parseInt(index, 10)) && Array.isArray(input)){
const arr = input.slice()
arr[ index ] = newValue
return arr
}
return assoc(
index, newValue, input
)
}
export const assocPath = curry(assocPathFn)
import { assocPath } from './assocPath'
test('adds a key to an empty object', () => {
expect(assocPath(
'a', 1, {}
)).toEqual({ a : 1 })
})
test('adds a key to a non-empty object', () => {
expect(assocPath(
'b', 2, { a : 1 }
)).toEqual({
a : 1,
b : 2,
})
})
test('adds a nested key to a non-empty object', () => {
expect(assocPath(
'b.c', 2, { a : 1 }
)).toEqual({
a : 1,
b : { c : 2 },
})
})
test('adds a nested key to a nested non-empty object - curry case 1', () => {
expect(assocPath('b.d',
3)({
a : 1,
b : { c : 2 },
})).toEqual({
a : 1,
b : {
c : 2,
d : 3,
},
})
})
test('adds a key to a non-empty object - curry case 1', () => {
expect(assocPath('b', 2)({ a : 1 })).toEqual({
a : 1,
b : 2,
})
})
test('adds a nested key to a non-empty object - curry case 1', () => {
expect(assocPath('b.c', 2)({ a : 1 })).toEqual({
a : 1,
b : { c : 2 },
})
})
test('adds a nested array to a non-empty object - curry case 1', () => {
expect(assocPath('b.0', 2)({ a : 1 })).toEqual({
a : 1,
b : [ 2 ],
})
})
test('adds a key to a non-empty object - curry case 2', () => {
expect(assocPath('b')(2, { a : 1 })).toEqual({
a : 1,
b : 2,
})
})
test('adds a key to a non-empty object - curry case 3', () => {
const result = assocPath('b')(2)({ a : 1 })
expect(result).toEqual({
a : 1,
b : 2,
})
})
test('changes an existing key', () => {
expect(assocPath(
'a', 2, { a : 1 }
)).toEqual({ a : 2 })
})
test('undefined is considered an empty object', () => {
expect(assocPath(
'a', 1, undefined
)).toEqual({ a : 1 })
})
test('null is considered an empty object', () => {
expect(assocPath(
'a', 1, null
)).toEqual({ a : 1 })
})
test('value can be null', () => {
expect(assocPath(
'a', null, null
)).toEqual({ a : null })
})
test('value can be undefined', () => {
expect(assocPath(
'a', undefined, null
)).toEqual({ a : undefined })
})
test('assignment is shallow', () => {
expect(assocPath(
'a', { b : 2 }, { a : { c : 3 } }
)).toEqual({ a : { b : 2 } })
})
test('happy', () => {
const result = assocPath(
[], 3, {
a : 1,
b : 2,
}
)
expect(result).toEqual(3)
})
test('happy', () => {
const expected = { foo : { bar : { baz : 42 } } }
const result = assocPath(
[ 'foo', 'bar', 'baz' ], 42, { foo : null }
)
expect(result).toEqual(expected)
})
both(pred1: Pred, pred2: Pred): Pred
It returns a function with input argument.
This function will return true, if both firstCondition and secondCondition return true when input is passed as their argument.
const firstCondition = x => x > 10
const secondCondition = x => x < 20
const fn = R.both(secondCondition)
const result = [fn(15), fn(30)]
// => [true, false]
Try the above R.both example in Rambda REPL
both(pred1: Pred, pred2: Pred): Pred;
both<T>(pred1: Predicate<T>, pred2: Predicate<T>): Predicate<T>;
both<T>(pred1: Predicate<T>): (pred2: Predicate<T>) => Predicate<T>;
both(pred1: Pred): (pred2: Pred) => Pred;
export function both(f, g){
if (arguments.length === 1) return _g => both(f, _g)
return (...input) => f(...input) && g(...input)
}
import { both } from './both'
const firstFn = val => val > 0
const secondFn = val => val < 10
test('with curry', () => {
expect(both(firstFn)(secondFn)(17)).toBeFalse()
})
test('without curry', () => {
expect(both(firstFn, secondFn)(7)).toBeTrue()
})
test('with multiple inputs', () => {
const between = function (
a, b, c
){
return a < b && b < c
}
const total20 = function (
a, b, c
){
return a + b + c === 20
}
const fn = both(between, total20)
expect(fn(
5, 7, 8
)).toBeTrue()
})
test('skip evaluation of the second expression', () => {
let effect = 'not evaluated'
const F = function (){
return false
}
const Z = function (){
effect = 'Z got evaluated'
}
both(F, Z)()
expect(effect).toBe('not evaluated')
})
import {both} from 'rambda'
describe('both', () => {
it('with passed type', () => {
const fn = both<number>( // $ExpectType Predicate<number>
x => {
return x > 1
},
x => {
return x % 2 === 0
}
)
const result = fn(2) // $ExpectType boolean
result // $ExpectType boolean
})
it('no type passed', () => {
const fn = both(
x => {
x // $ExpectType any
return x > 1
},
x => {
return x % 2 === 0
}
)
const result = fn(2) // $ExpectType boolean
result // $ExpectType boolean
})
})
describe('both + curry', () => {
it('with passed type', () => {
const fn = both<number>(x => {
return x > 1
})(x => {
return x % 2 === 0
})
fn // $ExpectType Predicate<number>
const result = fn(2) // $ExpectType boolean
result // $ExpectType boolean
})
it('no type passed', () => {
const fn = both(x => {
x // $ExpectType unknown
return (x as number) > 1
})(x => {
return (x as number) % 2 === 0
})
const result = fn(2) // $ExpectType boolean
result // $ExpectType boolean
})
})
Reason for the failure: ramda supports fantasy-land
var S = require('sanctuary');
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('both', function() {
it('accepts fantasy-land applicative functors', function() {
var Just = S.Just;
var Nothing = S.Nothing;
eq(R.both(Just(true), Just(true)), Just(true));
eq(R.both(Just(true), Just(false)), Just(false));
eq(R.both(Just(true), Nothing()), Nothing());
eq(R.both(Nothing(), Just(false)), Nothing());
eq(R.both(Nothing(), Nothing()), Nothing());
});
});
chain<T, U>(fn: (n: T) => readonly U[], list: readonly T[]): U[]
The method is also known as flatMap.
const duplicate = n => [ n, n ]
const list = [ 1, 2, 3 ]
const result = chain(duplicate, list)
// => [ 1, 1, 2, 2, 3, 3 ]
Try the above R.chain example in Rambda REPL
chain<T, U>(fn: (n: T) => readonly U[], list: readonly T[]): U[];
chain<T, U>(fn: (n: T) => readonly U[]): (list: readonly T[]) => U[];
chain<X0, X1, R>(fn: (x0: X0, x1: X1) => R, fn1: (x1: X1) => X0): (x1: X1) => R;
export function chain(fn, list){
if (arguments.length === 1){
return _list => chain(fn, _list)
}
return [].concat(...list.map(fn))
}
import { chain } from './chain.js'
const duplicate = n => [ n, n ]
test('happy', () => {
const fn = x => [ x * 2 ]
const list = [ 1, 2, 3 ]
const result = chain(fn, list)
expect(result).toEqual([ 2, 4, 6 ])
})
test('maps then flattens one level', () => {
expect(chain(duplicate, [ 1, 2, 3 ])).toEqual([ 1, 1, 2, 2, 3, 3 ])
})
test('maps then flattens one level - curry', () => {
expect(chain(duplicate)([ 1, 2, 3 ])).toEqual([ 1, 1, 2, 2, 3, 3 ])
})
test('flattens only one level', () => {
const nest = n => [ [ n ] ]
expect(chain(nest, [ 1, 2, 3 ])).toEqual([ [ 1 ], [ 2 ], [ 3 ] ])
})
import {chain} from 'rambda'
const list = [ 1, 2, 3 ]
const duplicate = (n: number) => [ n, n ]
describe('chain', () => {
it('without passing type', () => {
const result = chain(duplicate, list)
result // $ExpectType number[]
})
it('passing types', () => {
const duplicateAndModify = (x: number) => [
`||${x}||`,
`||${x}||`
]
const result = chain<number, string>(duplicateAndModify, list)
const resultCurried = chain<number, string>(duplicateAndModify)(list)
result // $ExpectType string[]
resultCurried // $ExpectType string[]
})
})
5 failed Ramda.chain specs
Reason for the failure: ramda passes to
chainif available | ramda supports fantasy-land
clamp(min: number, max: number, input: number): number
Restrict a number input to be withing min and max limits.
If input is bigger than max, then the result is max.
If input is smaller than min, then the result is min.
R.clamp(0, 10, 5) //=> 5
R.clamp(0, 10, -1) //=> 0
R.clamp(0, 10, 11) //=> 10
Try the above R.clamp example in Rambda REPL
clamp(min: number, max: number, input: number): number;
clamp(min: number, max: number): (input: number) => number;
import { curry } from './curry'
function clampFn(
min, max, input
){
if (input >= min && input <= max) return input
if (input > max) return max
if (input < min) return min
}
export const clamp = curry(clampFn)
import { clamp } from './clamp'
test('rambda specs', () => {
expect(clamp(
1, 10, 0
)).toEqual(1)
expect(clamp(
3, 12, 1
)).toEqual(3)
expect(clamp(
-15, 3, -100
)).toEqual(-15)
expect(clamp(
1, 10, 20
)).toEqual(10)
expect(clamp(
3, 12, 23
)).toEqual(12)
expect(clamp(
-15, 3, 16
)).toEqual(3)
expect(clamp(
1, 10, 4
)).toEqual(4)
expect(clamp(
3, 12, 6
)).toEqual(6)
expect(clamp(
-15, 3, 0
)).toEqual(0)
})
clone<T>(input: T): T
It creates a deep copy of the input, which may contain (nested) Arrays and Objects, Numbers, Strings, Booleans and Dates.
const objects = [{a: 1}, {b: 2}];
const objectsClone = R.clone(objects);
const result = [
R.equals(objects, objectsClone),
R.equals(objects[0], objectsClone[0]),
] // => [ true, true ]
Try the above R.clone example in Rambda REPL
clone<T>(input: T): T;
clone<T>(input: ReadonlyArray<T>): T[];
export function clone(input){
const out = Array.isArray(input) ? Array(input.length) : {}
if (input && input.getTime) return new Date(input.getTime())
for (const key in input){
const v = input[ key ]
out[ key ] =
typeof v === 'object' && v !== null ?
v.getTime ?
new Date(v.getTime()) :
clone(v) :
v
}
return out
}
import assert from 'assert'
import { clone } from './clone'
import { equals } from './equals'
test('with array', () => {
const arr = [
{
b : 2,
c : 'foo',
d : [ 1, 2, 3 ],
},
1,
new Date(),
null,
]
expect(clone(arr)).toEqual(arr)
})
test('with object', () => {
const arr = {
a : 1,
b : 2,
c : 3,
d : [ 1, 2, 3 ],
e : new Date(),
}
expect(clone(arr)).toEqual(arr)
})
test('with date', () => {
const date = new Date(
2014, 10, 14, 23, 59, 59, 999
)
const cloned = clone(date)
assert.notStrictEqual(date, cloned)
expect(cloned).toEqual(new Date(
2014, 10, 14, 23, 59, 59, 999
))
expect(cloned.getDay()).toEqual(5)
})
test('with R.equals', () => {
const objects = [ { a : 1 }, { b : 2 } ]
const objectsClone = clone(objects)
const result = [
equals(objects, objectsClone),
equals(objects[ 0 ], objectsClone[ 0 ]),
]
expect(result).toEqual([ true, true ])
})
Reason for the failure: rambda method work only with objects and arrays
var assert = require('assert');
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('deep clone integers, strings and booleans', function() {
it('clones integers', function() {
eq(R.clone(-4), -4);
eq(R.clone(9007199254740991), 9007199254740991);
});
it('clones floats', function() {
eq(R.clone(-4.5), -4.5);
eq(R.clone(0.0), 0.0);
});
it('clones strings', function() {
eq(R.clone('ramda'), 'ramda');
});
it('clones booleans', function() {
eq(R.clone(true), true);
});
});
describe('deep clone objects', function() {
it('clones objects with circular references', function() {
var x = {c: null};
var y = {a: x};
var z = {b: y};
x.c = z;
var clone = R.clone(x);
assert.notStrictEqual(x, clone);
assert.notStrictEqual(x.c, clone.c);
assert.notStrictEqual(x.c.b, clone.c.b);
assert.notStrictEqual(x.c.b.a, clone.c.b.a);
assert.notStrictEqual(x.c.b.a.c, clone.c.b.a.c);
eq(R.keys(clone), R.keys(x));
eq(R.keys(clone.c), R.keys(x.c));
eq(R.keys(clone.c.b), R.keys(x.c.b));
eq(R.keys(clone.c.b.a), R.keys(x.c.b.a));
eq(R.keys(clone.c.b.a.c), R.keys(x.c.b.a.c));
x.c.b = 1;
assert.notDeepEqual(clone.c.b, x.c.b);
});
});
describe('deep clone arrays', function() {
});
describe('deep clone functions', function() {
});
describe('built-in types', function() {
it('clones RegExp object', function() {
R.forEach(function(pattern) {
var clone = R.clone(pattern);
assert.notStrictEqual(clone, pattern);
eq(clone.constructor, RegExp);
eq(clone.source, pattern.source);
eq(clone.global, pattern.global);
eq(clone.ignoreCase, pattern.ignoreCase);
eq(clone.multiline, pattern.multiline);
}, [/x/, /x/g, /x/i, /x/m, /x/gi, /x/gm, /x/im, /x/gim]);
});
});
describe('deep clone deep nested mixed objects', function() {
it('clones array with mutual ref object', function() {
var obj = {a: 1};
var list = [{b: obj}, {b: obj}];
var clone = R.clone(list);
assert.strictEqual(list[0].b, list[1].b);
assert.strictEqual(clone[0].b, clone[1].b);
assert.notStrictEqual(clone[0].b, list[0].b);
assert.notStrictEqual(clone[1].b, list[1].b);
eq(clone[0].b, {a:1});
eq(clone[1].b, {a:1});
obj.a = 2;
eq(clone[0].b, {a:1});
eq(clone[1].b, {a:1});
});
});
describe('deep clone edge cases', function() {
it('nulls, undefineds and empty objects and arrays', function() {
eq(R.clone(null), null);
eq(R.clone(undefined), undefined);
assert.notStrictEqual(R.clone(undefined), null);
var obj = {};
assert.notStrictEqual(R.clone(obj), obj);
var list = [];
assert.notStrictEqual(R.clone(list), list);
});
});
describe('Let `R.clone` use an arbitrary user defined `clone` method', function() {
it('dispatches to `clone` method if present', function() {
function ArbitraryClone(x) { this.value = x; }
ArbitraryClone.prototype.clone = function() { return new ArbitraryClone(this.value); };
var obj = new ArbitraryClone(42);
var arbitraryClonedObj = R.clone(obj);
eq(arbitraryClonedObj, new ArbitraryClone(42));
eq(arbitraryClonedObj instanceof ArbitraryClone, true);
});
});
complement(pred: (...args: any[]) => boolean): (...args: any[]) => boolean
It returns inverted version of origin function that accept input as argument.
The return value of inverted is the negative boolean value of origin(input).
const origin = x => x > 5
const inverted = complement(origin)
const result = [
origin(7),
inverted(7)
] => [ true, false ]
Try the above R.complement example in Rambda REPL
complement(pred: (...args: any[]) => boolean): (...args: any[]) => boolean;
export function complement(fn){
return (...input) => !fn(...input)
}
import { complement } from './complement'
test('happy', () => {
const fn = complement(x => x.length === 0)
expect(fn([ 1, 2, 3 ])).toBeTrue()
})
test('with multiple parameters', () => {
const between = function (
a, b, c
){
return a < b && b < c
}
const f = complement(between)
expect(f(
4, 5, 11
)).toEqual(false)
expect(f(
12, 2, 6
)).toEqual(true)
})
Reason for the failure: ramda supports fantasy-land
var S = require('sanctuary');
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('complement', function() {
it('accepts fantasy-land functors', function() {
var Just = S.Just;
var Nothing = S.Nothing;
eq(R.complement(Just(true)), Just(false));
eq(R.complement(Just(false)), Just(true));
eq(R.complement(Nothing()), Nothing());
});
});
compose<T1>(fn0: () => T1): () => T1
It performs right-to-left function composition.
const result = R.compose(
R.map(x => x * 2),
R.filter(x => x > 2)
)([1, 2, 3, 4])
// => [6, 8]
Try the above R.compose example in Rambda REPL
compose<T1>(fn0: () => T1): () => T1;
compose<V0, T1>(fn0: (x0: V0) => T1): (x0: V0) => T1;
compose<V0, V1, T1>(fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T1;
compose<V0, V1, V2, T1>(fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T1;
export function compose(...fns){
if (fns.length === 0){
throw new Error('compose requires at least one argument')
}
return (...args) => {
const list = fns.slice()
if (list.length > 0){
const fn = list.pop()
let result = fn(...args)
while (list.length > 0){
result = list.pop()(result)
}
return result
}
}
}
import { add } from './add'
import { compose } from './compose'
import { filter } from './filter'
import { last } from './last'
import { map } from './map'
test('happy', () => {
const result = compose(
last, map(add(10)), map(add(1))
)([ 1, 2, 3 ])
expect(result).toEqual(14)
})
test('accepts initially two arguments', () => {
const result = compose(map(x => x * 2),
(a, y) => filter(x => x > y, a))([ 1, 2, 3, 4 ], 2)
expect(result).toEqual([ 6, 8 ])
})
test('when no arguments is passed', () => {
expect(() => compose()).toThrow('compose requires at least one argument')
})
test('ramda spec', () => {
const f = function (
a, b, c
){
return [ a, b, c ]
}
const g = compose(f)
expect(g(
1, 2, 3
)).toEqual([ 1, 2, 3 ])
})
Reason for the failure: ramda passes context to functions | rambda composed functions have no length
var assert = require('assert');
var jsv = require('jsverify');
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('compose', function() {
it('performs right-to-left function composition', function() {
// f :: (String, Number?) -> ([Number] -> [Number])
var f = R.compose(R.map, R.multiply, parseInt);
eq(f.length, 2);
eq(f('10')([1, 2, 3]), [10, 20, 30]);
eq(f('10', 2)([1, 2, 3]), [2, 4, 6]);
});
it('passes context to functions', function() {
function x(val) {
return this.x * val;
}
function y(val) {
return this.y * val;
}
function z(val) {
return this.z * val;
}
var context = {
a: R.compose(x, y, z),
x: 4,
y: 2,
z: 1
};
eq(context.a(5), 40);
});
it('can be applied to one argument', function() {
var f = function(a, b, c) { return [a, b, c]; };
var g = R.compose(f);
eq(g.length, 3);
eq(g(1, 2, 3), [1, 2, 3]);
});
});
describe('compose properties', function() {
jsv.property('composes two functions', jsv.fn(), jsv.fn(), jsv.nat, function(f, g, x) {
return R.equals(R.compose(f, g)(x), f(g(x)));
jsv.property('associative', jsv.fn(), jsv.fn(), jsv.fn(), jsv.nat, function(f, g, h, x) {
var result = f(g(h(x)));
return R.all(R.equals(result), [
R.compose(f, g, h)(x),
R.compose(f, R.compose(g, h))(x),
R.compose(R.compose(f, g), h)(x)
]);
});
concat<T>(x: ReadonlyArray<T>, y: ReadonlyArray<T>): T[]
It returns a new string or array, which is the result of merging x and y.
R.concat([1, 2])([3, 4]) // => [1, 2, 3, 4]
R.concat('foo', 'bar') // => 'foobar'
Try the above R.concat example in Rambda REPL
concat<T>(x: ReadonlyArray<T>, y: ReadonlyArray<T>): T[];
concat<T>(x: ReadonlyArray<T>): (y: ReadonlyArray<T>) => T[];
concat(x: string, y: string): string;
concat(x: string): (y: string) => string;
export function concat(x, y){
if (arguments.length === 1) return _y => concat(x, _y)
return typeof x === 'string' ? `${ x }${ y }` : [ ...x, ...y ]
}
import { concat } from './concat'
test('happy', () => {
const arr1 = [ 'a', 'b', 'c' ]
const arr2 = [ 'd', 'e', 'f' ]
const a = concat(arr1, arr2)
const b = concat(arr1)(arr2)
const expectedResult = [ 'a', 'b', 'c', 'd', 'e', 'f' ]
expect(a).toEqual(expectedResult)
expect(b).toEqual(expectedResult)
})
test('with strings', () => {
expect(concat('ABC', 'DEF')).toEqual('ABCDEF')
})
Reason for the failure: ramda pass to concat method if present
var assert = require('assert');
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('concat', function() {
var z1 = {
x: 'z1',
concat: function(that) { return this.x + ' ' + that.x; }
};
var z2 = {
x: 'z2'
};
it('delegates to non-String object with a concat method, as second param', function() {
eq(R.concat(z1, z2), 'z1 z2');
});
});
cond(conditions: [Pred, (...a: readonly any[]) => any][]): (...a: readonly any[]) => any
It takes list with conditions and returns a new function fn that expects input as argument.
This function will start evaluating the conditions in order to find the first winner(order of conditions matter).
The winner is this condition, which left side returns true when input is its argument. Then the evaluation of the right side of the winner will be the final result.
If no winner is found, then fn returns undefined.
const fn = R.cond([
[ x => x > 25, R.always('more than 25') ],
[ x => x > 15, R.always('more than 15') ],
[ R.T, x => `${x} is nothing special` ],
])
const result = [
fn(30),
fn(20),
fn(10),
]
// => ['more than 25', 'more than 15', '10 is nothing special']
Try the above R.cond example in Rambda REPL
cond(conditions: [Pred, (...a: readonly any[]) => any][]): (...a: readonly any[]) => any;
cond<A, B>(conditions: [SafePred<A>, (...a: readonly A[]) => B][]): (...a: readonly A[]) => B;
export function cond(conditions){
return input => {
let done = false
let toReturn
conditions.forEach(([ predicate, resultClosure ]) => {
if (!done && predicate(input)){
done = true
toReturn = resultClosure(input)
}
})
return toReturn
}
}
import { always } from './always.js'
import { cond } from './cond'
import { equals } from './equals.js'
import { T } from './T.js'
test('returns a function', () => {
expect(typeof cond([])).toEqual('function')
})
test('returns a conditional function', () => {
const fn = cond([
[ equals(0), always('water freezes at 0°C') ],
[ equals(100), always('water boils at 100°C') ],
[
T,
function (temp){
return 'nothing special happens at ' + temp + '°C'
},
],
])
expect(fn(0)).toEqual('water freezes at 0°C')
expect(fn(50)).toEqual('nothing special happens at 50°C')
expect(fn(100)).toEqual('water boils at 100°C')
})
test('no winner', () => {
const fn = cond([
[ equals('foo'), always(1) ],
[ equals('bar'), always(2) ],
])
expect(fn('quux')).toEqual(undefined)
})
test('predicates are tested in order', () => {
const fn = cond([
[ T, always('foo') ],
[ T, always('bar') ],
[ T, always('baz') ],
])
expect(fn()).toEqual('foo')
})
import {cond, always, equals} from 'rambda'
describe('cond', () => {
it('happy', () => {
const fn = cond<number, string>([
[equals(0), always('water freezes at 0°C')],
[equals(100), always('water boils at 100°C')],
[
() => true,
function(temp) {
return 'nothing special happens at ' + temp + '°C'
},
],
])
const a = fn(0)
a // $ExpectType string
})
})
Reason for the failure: pass to transformer is not applied in rambda
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('cond', function() {
it('forwards all arguments to predicates and to transformers', function() {
var fn = R.cond([
[function(_, x) { return x === 42; }, function() { return arguments.length; }]
]);
eq(fn(21, 42, 84), 3);
});
it('retains highest predicate arity', function() {
var fn = R.cond([
[R.nAry(2, R.T), R.T],
[R.nAry(3, R.T), R.T],
[R.nAry(1, R.T), R.T]
]);
eq(fn.length, 3);
});
});
converge(after: ((...a: readonly any[]) => any), fns: Array<((...a: readonly any[]) => any)>): (...a: readonly any[]) => any
converge(after: ((...a: readonly any[]) => any), fns: Array<((...a: readonly any[]) => any)>): (...a: readonly any[]) => any;
import { curryN } from './curryN'
import { map } from './map'
import { max } from './max'
import { reduce } from './reduce'
export function converge(fn, transformers){
if (arguments.length === 1)
return _transformers => converge(fn, _transformers)
const highestArity = reduce(
(a, b) => max(a, b.length), 0, transformers
)
return curryN(highestArity, function (){
return fn.apply(this,
map(g => g.apply(this, arguments), transformers))
})
}
import { add } from './add'
import { converge } from './converge'
const mult = function (a, b){
return a * b
}
const f1 = converge(mult, [
function (a){
return a
},
function (a){
return a
},
])
const f2 = converge(mult, [
function (a){
return a
},
function (a, b){
return b
},
])
const f3 = converge(mult, [
function (a){
return a
},
function (
a, b, c
){
return c
},
])
test('passes the results of applying the arguments individually to two separate functions into a single one', () => {
expect(converge(mult, [ add(1), add(3) ])(2)).toEqual(15) // mult(add1(2), add3(2)) = mult(3, 5) = 3 * 15;
})
test('returns a function with the length of the "longest" argument', () => {
expect(f1.length).toEqual(1)
expect(f2.length).toEqual(2)
expect(f3.length).toEqual(3)
})
test('passes context to its functions', () => {
const a = function (x){
return this.f1(x)
}
const b = function (x){
return this.f2(x)
}
const c = function (x, y){
return this.f3(x, y)
}
const d = converge(c, [ a, b ])
const context = {
f1 : add(1),
f2 : add(2),
f3 : add,
}
expect(a.call(context, 1)).toEqual(2)
expect(b.call(context, 1)).toEqual(3)
expect(d.call(context, 1)).toEqual(5)
})
test('returns a curried function', () => {
expect(f2(6)(7)).toEqual(42)
expect(f3().length).toEqual(3)
})
test('works with empty functions list', () => {
const fn = converge(function (){
return arguments.length
}, [])
expect(fn.length).toEqual(0)
expect(fn()).toEqual(0)
})
curry<F extends (...args: any) => any>(f: F): FToolbelt.Curry<F>
It expects a function as input and returns its curried version.
const fn = (a, b, c) => a + b + c
const curried = R.curry(fn)
const sum = curried(1,2)
const result = sum(3) // => 6
Try the above R.curry example in Rambda REPL
curry<F extends (...args: any) => any>(f: F): FToolbelt.Curry<F>;
export function curry(fn, args = []){
return (..._args) =>
(rest => rest.length >= fn.length ? fn(...rest) : curry(fn, rest))([
...args,
..._args,
])
}
import { curry } from './curry'
test('happy', () => {
const addFourNumbers = (
a, b, c, d
) => a + b + c + d
const curriedAddFourNumbers = curry(addFourNumbers)
const f = curriedAddFourNumbers(1, 2)
const g = f(3)
expect(g(4)).toEqual(10)
})
test('when called with more arguments', () => {
const add = curry((n, n2) => n + n2)
expect(add(
1, 2, 3
)).toEqual(3)
})
test('when called with zero arguments', () => {
const sub = curry((a, b) => a - b)
const s0 = sub()
expect(s0(5, 2)).toEqual(3)
})
test('when called via multiple curry stages', () => {
const join = curry((
a, b, c, d
) => [ a, b, c, d ].join('-'))
const stage1 = join('A')
const stage2 = stage1('B', 'C')
expect(stage2('D')).toEqual('A-B-C-D')
})
Reason for the failure: ramda passes context to functions
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
var jsv = require('jsverify');
var funcN = require('./shared/funcN');
describe('curry', function() {
it('properly reports the length of the curried function', function() {
var f = R.curry(function(a, b, c, d) {return (a + b * c) / d;});
eq(f.length, 4);
var g = f(12);
eq(g.length, 3);
var h = g(3);
eq(h.length, 2);
eq(g(3, 6).length, 1);
});
it('preserves context', function() {
var ctx = {x: 10};
var f = function(a, b) { return a + b * this.x; };
var g = R.curry(f);
eq(g.call(ctx, 2, 4), 42);
eq(g.call(ctx, 2).call(ctx, 4), 42);
});
it('supports R.__ placeholder', function() {
var f = function(a, b, c) { return [a, b, c]; };
var g = R.curry(f);
var _ = R.__;
eq(g(1)(2)(3), [1, 2, 3]);
eq(g(1)(2, 3), [1, 2, 3]);
eq(g(1, 2)(3), [1, 2, 3]);
eq(g(1, 2, 3), [1, 2, 3]);
eq(g(_, 2, 3)(1), [1, 2, 3]);
eq(g(1, _, 3)(2), [1, 2, 3]);
eq(g(1, 2, _)(3), [1, 2, 3]);
eq(g(1, _, _)(2)(3), [1, 2, 3]);
eq(g(_, 2, _)(1)(3), [1, 2, 3]);
eq(g(_, _, 3)(1)(2), [1, 2, 3]);
eq(g(1, _, _)(2, 3), [1, 2, 3]);
eq(g(_, 2, _)(1, 3), [1, 2, 3]);
eq(g(_, _, 3)(1, 2), [1, 2, 3]);
eq(g(1, _, _)(_, 3)(2), [1, 2, 3]);
eq(g(_, 2, _)(_, 3)(1), [1, 2, 3]);
eq(g(_, _, 3)(_, 2)(1), [1, 2, 3]);
eq(g(_, _, _)(_, _)(_)(1, 2, 3), [1, 2, 3]);
eq(g(_, _, _)(1, _, _)(_, _)(2, _)(_)(3), [1, 2, 3]);
});
it('supports @@functional/placeholder', function() {
var f = function(a, b, c) { return [a, b, c]; };
var g = R.curry(f);
var _ = {'@@functional/placeholder': true, x: Math.random()};
eq(g(1)(2)(3), [1, 2, 3]);
eq(g(1)(2, 3), [1, 2, 3]);
eq(g(1, 2)(3), [1, 2, 3]);
eq(g(1, 2, 3), [1, 2, 3]);
eq(g(_, 2, 3)(1), [1, 2, 3]);
eq(g(1, _, 3)(2), [1, 2, 3]);
eq(g(1, 2, _)(3), [1, 2, 3]);
eq(g(1, _, _)(2)(3), [1, 2, 3]);
eq(g(_, 2, _)(1)(3), [1, 2, 3]);
eq(g(_, _, 3)(1)(2), [1, 2, 3]);
eq(g(1, _, _)(2, 3), [1, 2, 3]);
eq(g(_, 2, _)(1, 3), [1, 2, 3]);
eq(g(_, _, 3)(1, 2), [1, 2, 3]);
eq(g(1, _, _)(_, 3)(2), [1, 2, 3]);
eq(g(_, 2, _)(_, 3)(1), [1, 2, 3]);
eq(g(_, _, 3)(_, 2)(1), [1, 2, 3]);
eq(g(_, _, _)(_, _)(_)(1, 2, 3), [1, 2, 3]);
eq(g(_, _, _)(1, _, _)(_, _)(2, _)(_)(3), [1, 2, 3]);
});
});
describe('curry properties', function() {
jsv.property('curries multiple values', funcN(4), jsv.json, jsv.json, jsv.json, jsv.json, function(f, a, b, c, d) {
var g = R.curry(f);
return R.all(R.equals(f(a, b, c, d)), [
g(a, b, c, d),
g(a)(b)(c)(d),
g(a)(b, c, d),
g(a, b)(c, d),
g(a, b, c)(d)
]);
jsv.property('curries with placeholder', funcN(3), jsv.json, jsv.json, jsv.json, function(f, a, b, c) {
var _ = {'@@functional/placeholder': true, x: Math.random()};
var g = R.curry(f);
return R.all(R.equals(f(a, b, c)), [
g(_, _, c)(a, b),
g(a, _, c)(b),
g(_, b, c)(a),
g(a, _, _)(_, c)(b),
g(a, b, _)(c)
]);
});
curryN(length: number, fn: (...args: readonly any[]) => any): (...a: readonly any[]) => any
It returns a curried equivalent of the provided function, with the specified arity.
curryN(length: number, fn: (...args: readonly any[]) => any): (...a: readonly any[]) => any;
function _curryN(
n, cache, fn
){
return function (){
// concat cache and the arguments as fast as possible https://jsperf.com/concat-two-arrays-quickly
let ci = 0
let ai = 0
const cl = cache.length
const al = arguments.length
const args = new Array(cl + al)
while (ci < cl){
args[ ci ] = cache[ ci ]
ci++
}
while (ai < al){
args[ cl + ai ] = arguments[ ai ]
ai++
}
const remaining = n - args.length
return args.length >= n ?
fn.apply(this, args) :
_arity(remaining, _curryN(
n, args, fn
))
}
}
function _arity(n, fn){
switch (n){
case 0:
return function (){
return fn.apply(this, arguments)
}
case 1:
return function (_1){
return fn.apply(this, arguments)
}
case 2:
return function (_1, _2){
return fn.apply(this, arguments)
}
case 3:
return function (
_1, _2, _3
){
return fn.apply(this, arguments)
}
case 4:
return function (
_1, _2, _3, _4
){
return fn.apply(this, arguments)
}
case 5:
return function (
_1, _2, _3, _4, _5
){
return fn.apply(this, arguments)
}
case 6:
return function (
_1, _2, _3, _4, _5, _6
){
return fn.apply(this, arguments)
}
case 7:
return function (
_1, _2, _3, _4, _5, _6, _7
){
return fn.apply(this, arguments)
}
case 8:
return function (
_1, _2, _3, _4, _5, _6, _7, _8
){
return fn.apply(this, arguments)
}
case 9:
return function (
_1, _2, _3, _4, _5, _6, _7, _8, _9
){
return fn.apply(this, arguments)
}
case 10:
return function (
_1, _2, _3, _4, _5, _6, _7, _8, _9, _10
){
return fn.apply(this, arguments)
}
default:
throw new Error('First argument to _arity must be a non-negative integer no greater than ten')
}
}
export function curryN(n, fn){
if (arguments.length === 1) return _fn => curryN(n, _fn)
return _arity(n, _curryN(
n, [], fn
))
}
import { curryN } from './curryN'
describe('curryN', () => {
function source(
a, b, c, d
){
void d
return a * b * c
}
it('accepts an arity', () => {
const curried = curryN(3, source)
expect(curried(1)(2)(3)).toEqual(6)
expect(curried(1, 2)(3)).toEqual(6)
expect(curried(1)(2, 3)).toEqual(6)
expect(curried(
1, 2, 3
)).toEqual(6)
})
it('can be partially applied', () => {
const curry3 = curryN(3)
const curried = curry3(source)
expect(curried.length).toEqual(3)
expect(curried(1)(2)(3)).toEqual(6)
expect(curried(1, 2)(3)).toEqual(6)
expect(curried(1)(2, 3)).toEqual(6)
expect(curried(
1, 2, 3
)).toEqual(6)
})
it('preserves context', () => {
const ctx = { x : 10 }
const f = function (a, b){
return a + b * this.x
}
const g = curryN(2, f)
expect(g.call(
ctx, 2, 4
)).toEqual(42)
expect(g.call(ctx, 2).call(ctx, 4)).toEqual(42)
})
it('forwards extra arguments', () => {
const f = function (){
return Array.prototype.slice.call(arguments)
}
const g = curryN(3, f)
expect(g(
1, 2, 3
)).toEqual([ 1, 2, 3 ])
expect(g(
1, 2, 3, 4
)).toEqual([ 1, 2, 3, 4 ])
expect(g(1, 2)(3, 4)).toEqual([ 1, 2, 3, 4 ])
expect(g(1)(
2, 3, 4
)).toEqual([ 1, 2, 3, 4 ])
expect(g(1)(2)(3, 4)).toEqual([ 1, 2, 3, 4 ])
})
})
dec(x: number): number
It decrements a number.
dec(x: number): number;
export const dec = x => x - 1
import { dec } from './dec'
test('happy', () => {
expect(dec(2)).toBe(1)
})
defaultTo<T>(defaultValue: T): (...inputArguments: (T | null | undefined)[]) => T
It returns defaultValue, if all of inputArguments are undefined, null or NaN.
Else, it returns the first truthy inputArguments instance(from left to right).
// With single input argument
R.defaultTo('foo', 'bar') // => 'bar'
R.defaultTo('foo', undefined) // => 'foo'
// With multiple input arguments
R.defaultTo('foo', undefined, null, NaN) // => 'foo'
R.defaultTo('foo', undefined, 'bar', NaN, 'qux') // => 'bar'
R.defaultTo('foo', undefined, null, NaN, 'quz') // => 'qux'
Try the above R.defaultTo example in Rambda REPL
defaultTo<T>(defaultValue: T): (...inputArguments: (T | null | undefined)[]) => T;
defaultTo<T>(defaultValue: T, ...inputArguments: (T | null | undefined)[]): T;
defaultTo<T, U>(defaultValue: T | U, ...inputArguments: (T | U | null | undefined)[]): T | U;
function flagIs(inputArguments){
return (
inputArguments === undefined ||
inputArguments === null ||
Number.isNaN(inputArguments) === true
)
}
export function defaultTo(defaultArgument, ...inputArguments){
if (arguments.length === 1){
return _inputArguments => defaultTo(defaultArgument, _inputArguments)
} else if (arguments.length === 2){
return flagIs(inputArguments[ 0 ]) ? defaultArgument : inputArguments[ 0 ]
}
const limit = inputArguments.length - 1
let len = limit + 1
let ready = false
let holder
while (!ready){
const instance = inputArguments[ limit - len + 1 ]
if (len === 0){
ready = true
} else if (flagIs(instance)){
len -= 1
} else {
holder = instance
ready = true
}
}
return holder === undefined ? defaultArgument : holder
}
import { defaultTo } from './defaultTo'
test('with undefined', () => {
expect(defaultTo('foo')(undefined)).toEqual('foo')
})
test('with null', () => {
expect(defaultTo('foo')(null)).toEqual('foo')
})
test('with NaN', () => {
expect(defaultTo('foo')(NaN)).toEqual('foo')
})
test('with empty string', () => {
expect(defaultTo('foo', '')).toEqual('')
})
test('with false', () => {
expect(defaultTo('foo', false)).toEqual(false)
})
test('when inputArgument passes initial check', () => {
expect(defaultTo('foo', 'bar')).toEqual('bar')
})
test('default extends to indefinite input arguments - case 1', () => {
const result = defaultTo(
'foo', null, 'bar'
)
const expected = 'bar'
expect(result).toEqual(expected)
})
test('default extends to indefinite input arguments - case 2', () => {
const result = defaultTo(
'foo', null, NaN, 'bar'
)
const expected = 'bar'
expect(result).toEqual(expected)
})
test('default extends to indefinite input arguments - case 3', () => {
const result = defaultTo(
'foo', null, NaN, undefined
)
const expected = 'foo'
expect(result).toEqual(expected)
})
test('default extends to indefinite input arguments - case 4', () => {
const result = defaultTo(
'foo', null, NaN, undefined, 'bar'
)
const expected = 'bar'
expect(result).toEqual(expected)
})
test('default extends to indefinite input arguments - case 5', () => {
const result = defaultTo(
'foo', null, NaN, 'bar', 'baz'
)
const expected = 'bar'
expect(result).toEqual(expected)
})
test('default extends to indefinite input arguments - case 6', () => {
const result = defaultTo(
'foo', null, NaN, undefined, null, NaN
)
const expected = 'foo'
expect(result).toEqual(expected)
})
import {defaultTo} from 'rambda'
describe('defaultTo with Ramda spec', () => {
it('happy', () => {
const x = defaultTo<string>('foo', undefined) // $ExpectType string
x // $ExpectType string
})
it('fallback', () => {
const x = defaultTo('foo', undefined) // $ExpectType "foo"
x // $ExpectType "foo"
const y = defaultTo('foo', 'bar') // $ExpectType "foo" | "bar"
y // $ExpectType "foo" | "bar"
})
it('with one type', () => {
const x = defaultTo<string>('foo', 'bar') // $ExpectType string
x // $ExpectType string
})
it('with two types', () => {
const x = defaultTo<string, number>('foo', 1) // $ExpectType string | number
x // $ExpectType string | number
})
})
describe('defaultTo with Rambda spec', () => {
it('happy', () => {
const x = defaultTo<string>('foo', undefined, 'bar') // $ExpectType string
x // $ExpectType string
})
it('happy with curry', () => {
const fn = defaultTo<string>('foo')
const x = fn(undefined, 'bar', null) // $ExpectType string
x // $ExpectType string
const y = fn(undefined) // $ExpectType string
y // $ExpectType string
})
it('with two types', () => {
const x = defaultTo<string, number>('foo', undefined, 1, null, 2, 'bar') // $ExpectType string | number
x // $ExpectType string | number
})
})
difference<T>(a: ReadonlyArray<T>, b: ReadonlyArray<T>): T[]
It returns the uniq set of all elements in the first list a not contained in the second list b.
const a = [ 1, 2, 3, 4 ]
const b = [ 3, 4, 5, 6 ]
const result = difference(a, b)
// => [ 1, 2 ]
Try the above R.difference example in Rambda REPL
difference<T>(a: ReadonlyArray<T>, b: ReadonlyArray<T>): T[];
difference<T>(a: ReadonlyArray<T>): (b: ReadonlyArray<T>) => T[];
import { includes } from './includes'
import { uniq } from './uniq'
export function difference(a, b){
if (arguments.length === 1) return _b => difference(a, _b)
return uniq(a).filter(aInstance => !includes(aInstance, b))
}
import { difference } from './difference'
test('difference', () => {
const a = [ 1, 2, 3, 4 ]
const b = [ 3, 4, 5, 6 ]
expect(difference(a)(b)).toEqual([ 1, 2 ])
expect(difference([], [])).toEqual([])
})
test('difference with objects', () => {
const a = [ { id : 1 }, { id : 2 }, { id : 3 }, { id : 4 } ]
const b = [ { id : 3 }, { id : 4 }, { id : 5 }, { id : 6 } ]
expect(difference(a, b)).toEqual([ { id : 1 }, { id : 2 } ])
})
test('no duplicates in first list', () => {
const M2 = [ 1, 2, 3, 4, 1, 2, 3, 4 ]
const N2 = [ 3, 3, 4, 4, 5, 5, 6, 6 ]
expect(difference(M2, N2)).toEqual([ 1, 2 ])
})
test('should use R.equals', () => {
expect(difference([ NaN ], [ NaN ]).length).toEqual(0)
})
Reason for the failure: ramda supports negative zero
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('difference', function() {
var M = [1, 2, 3, 4];
var M2 = [1, 2, 3, 4, 1, 2, 3, 4];
var N = [3, 4, 5, 6];
var N2 = [3, 3, 4, 4, 5, 5, 6, 6];
var Z = [3, 4, 5, 6, 10];
var Z2 = [1, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8];
it('has R.equals semantics', function() {
function Just(x) { this.value = x; }
Just.prototype.equals = function(x) {
return x instanceof Just && R.equals(x.value, this.value);
};
eq(R.difference([0], [-0]).length, 1);
eq(R.difference([-0], [0]).length, 1);
eq(R.difference([NaN], [NaN]).length, 0);
eq(R.difference([new Just([42])], [new Just([42])]).length, 0);
});
});
dissoc<T>(prop: string, obj: any): T
It returns a new object that does not contain property prop.
R.dissoc('b', {a: 1, b: 2, c: 3})
//=> {a: 1, c: 3}
Try the above R.dissoc example in Rambda REPL
dissoc<T>(prop: string, obj: any): T;
dissoc(prop: string): <U>(obj: any) => U;
export function dissoc(prop, obj){
if (arguments.length === 1) return _obj => dissoc(prop, _obj)
if (obj === null || obj === undefined) return {}
const willReturn = {}
for (const p in obj){
willReturn[ p ] = obj[ p ]
}
delete willReturn[ prop ]
return willReturn
}
import { dissoc } from './dissoc'
test('input is null or undefined', () => {
expect(dissoc('b', null)).toEqual({})
expect(dissoc('b', undefined)).toEqual({})
})
test('property exists curried', () => {
expect(dissoc('b')({
a : 1,
b : 2,
})).toEqual({ a : 1 })
})
test('property doesn\'t exists', () => {
expect(dissoc('c', {
a : 1,
b : 2,
})).toEqual({
a : 1,
b : 2,
})
})
test('works with non-string property', () => {
expect(dissoc(42, {
a : 1,
42 : 2,
})).toEqual({ a : 1 })
expect(dissoc(null, {
a : 1,
null : 2,
})).toEqual({ a : 1 })
expect(dissoc(undefined, {
a : 1,
undefined : 2,
})).toEqual({ a : 1 })
})
test('includes prototype properties', () => {
function Rectangle(width, height){
this.width = width
this.height = height
}
const area = Rectangle.prototype.area = function (){
return this.width * this.height
}
const rect = new Rectangle(7, 6)
expect(dissoc('area', rect)).toEqual({
width : 7,
height : 6,
})
expect(dissoc('width', rect)).toEqual({
height : 6,
area : area,
})
expect(dissoc('depth', rect)).toEqual({
width : 7,
height : 6,
area : area,
})
})
divide(a: number, b: number): number
R.divide(71, 100) // => 0.71
Try the above R.divide example in Rambda REPL
divide(a: number, b: number): number;
divide(a: number): (b: number) => number;
export function divide(a, b){
if (arguments.length === 1) return _b => divide(a, _b)
return a / b
}
import { divide } from './divide'
test('happy', () => {
expect(divide(71, 100)).toEqual(0.71)
expect(divide(71)(100)).toEqual(0.71)
})
drop<T>(howManyToDrop: number, listOrString: ReadonlyArray<T>): T[]
It returns listOrString with howManyToDrop items dropped from its beginning.
R.drop(2, ['foo', 'bar', 'baz']) // => ['baz']
R.drop(2, 'foobar') // => 'obar'
Try the above R.drop example in Rambda REPL
drop<T>(howManyToDrop: number, listOrString: ReadonlyArray<T>): T[];
drop(howManyToDrop: number, listOrString: string): string;
drop<T>(howManyToDrop: number): {
(listOrString: string): string;
(listOrString: ReadonlyArray<T>): T[];
};
export function drop(howManyToDrop, listOrString){
if (arguments.length === 1) return _list => drop(howManyToDrop, _list)
return listOrString.slice(howManyToDrop > 0 ? howManyToDrop : 0)
}
import assert from 'assert'
import { drop } from './drop'
test('with array', () => {
expect(drop(2)([ 'foo', 'bar', 'baz' ])).toEqual([ 'baz' ])
expect(drop(3, [ 'foo', 'bar', 'baz' ])).toEqual([])
expect(drop(4, [ 'foo', 'bar', 'baz' ])).toEqual([])
})
test('with string', () => {
expect(drop(3, 'rambda')).toEqual('bda')
})
test('with non-positive count', () => {
expect(drop(0, [ 1, 2, 3 ])).toEqual([ 1, 2, 3 ])
expect(drop(-1, [ 1, 2, 3 ])).toEqual([ 1, 2, 3 ])
expect(drop(-Infinity, [ 1, 2, 3 ])).toEqual([ 1, 2, 3 ])
})
test('should return copy', () => {
const xs = [ 1, 2, 3 ]
assert.notStrictEqual(drop(0, xs), xs)
assert.notStrictEqual(drop(-1, xs), xs)
})
import {drop} from 'rambda'
describe('drop', () => {
it('happy', () => {
const x = drop(2, 'foo') // $ExpectType string
x // $ExpectType string
const xx = drop(2)('foo') // $ExpectType string
xx // $ExpectType string
const y = drop(2, [1, 2, 3]) // $ExpectType number[]
y // $ExpectType number[]
const yy = drop<number>(2)([1, 2, 3]) // $ExpectType number[]
yy // $ExpectType number[]
})
})
dropLast<T>(howManyToDrop: number, listOrString: ReadonlyArray<T>): T[]
It returns listOrString with howManyToDrop items dropped from its end.
R.dropLast(2, ['foo', 'bar', 'baz']) // => ['foo']
R.dropLast(2, 'foobar') // => 'foob'
Try the above R.dropLast example in Rambda REPL
dropLast<T>(howManyToDrop: number, listOrString: ReadonlyArray<T>): T[];
dropLast(howManyToDrop: number, listOrString: string): string;
dropLast<T>(howManyToDrop: number): {
(listOrString: ReadonlyArray<T>): T[];
(listOrString: string): string;
};
export function dropLast(howManyToDrop, listOrString){
if (arguments.length === 1){
return _listOrString => dropLast(howManyToDrop, _listOrString)
}
return howManyToDrop > 0 ?
listOrString.slice(0, -howManyToDrop) :
listOrString.slice()
}
import assert from 'assert'
import { dropLast } from './dropLast'
test('with array', () => {
expect(dropLast(2)([ 'foo', 'bar', 'baz' ])).toEqual([ 'foo' ])
expect(dropLast(3, [ 'foo', 'bar', 'baz' ])).toEqual([])
expect(dropLast(4, [ 'foo', 'bar', 'baz' ])).toEqual([])
})
test('with string', () => {
expect(dropLast(3, 'rambda')).toEqual('ram')
})
test('with non-positive count', () => {
expect(dropLast(0, [ 1, 2, 3 ])).toEqual([ 1, 2, 3 ])
expect(dropLast(-1, [ 1, 2, 3 ])).toEqual([ 1, 2, 3 ])
expect(dropLast(-Infinity, [ 1, 2, 3 ])).toEqual([ 1, 2, 3 ])
})
test('should return copy', () => {
const xs = [ 1, 2, 3 ]
assert.notStrictEqual(dropLast(0, xs), xs)
assert.notStrictEqual(dropLast(-1, xs), xs)
})
Reason for the failure: ramda method can act as a transducer
var assert = require('assert');
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('dropLast', function() {
it('can act as a transducer', function() {
var dropLast2 = R.dropLast(2);
assert.deepEqual(R.into([], dropLast2, [1, 3, 5, 7, 9, 1, 2]), [1, 3, 5, 7, 9]);
assert.deepEqual(R.into([], dropLast2, [1]), []);
});
});
either(firstPredicate: Pred, secondPredicate: Pred): Pred
It returns a new predicate function from firstPredicate and secondPredicate inputs.
This predicate function will return true, if any of the two input predicates return true.
const firstPredicate = x => x > 10
const secondPredicate = x => x % 2 === 0
const predicate = R.either(firstPredicate, secondPredicate)
const result = [
predicate(15),
predicate(8),
predicate(7),
]
//=> [true, true, false]
Try the above R.either example in Rambda REPL
either(firstPredicate: Pred, secondPredicate: Pred): Pred;
either(firstPredicate: Pred): (secondPredicate: Pred) => Pred;
export function either(firstPredicate, secondPredicate){
if (arguments.length === 1){
return _secondPredicate => either(firstPredicate, _secondPredicate)
}
return (...input) =>
Boolean(firstPredicate(...input) || secondPredicate(...input))
}
import { either } from './either'
test('with multiple inputs', () => {
const between = function (
a, b, c
){
return a < b && b < c
}
const total20 = function (
a, b, c
){
return a + b + c === 20
}
const fn = either(between, total20)
expect(fn(
7, 8, 5
)).toBeTrue()
})
test('skip evaluation of the second expression', () => {
let effect = 'not evaluated'
const F = function (){
return true
}
const Z = function (){
effect = 'Z got evaluated'
}
either(F, Z)()
expect(effect).toBe('not evaluated')
})
test('case 1', () => {
const firstFn = val => val > 0
const secondFn = val => val * 5 > 10
expect(either(firstFn, secondFn)(1)).toBeTrue()
})
test('case 2', () => {
const firstFn = val => val > 0
const secondFn = val => val === -10
const fn = either(firstFn)(secondFn)
expect(fn(-10)).toBeTrue()
})
Reason for the failure: ramda supports fantasy-land
var S = require('sanctuary');
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('either', function() {
it('accepts fantasy-land applicative functors', function() {
var Just = S.Just;
var Nothing = S.Nothing;
eq(R.either(Just(true), Just(true)), Just(true));
eq(R.either(Just(true), Just(false)), Just(true));
eq(R.either(Just(false), Just(false)), Just(false));
eq(R.either(Just(true), Nothing()), Nothing());
eq(R.either(Nothing(), Just(false)), Nothing());
eq(R.either(Nothing(), Nothing()), Nothing());
});
});
endsWith(target: string, str: string): boolean
Curried version of String.prototype.endsWith
const str = 'foo-bar'
const target = '-bar'
const result = R.endsWith(target, str)
// => true
Try the above R.endsWith example in Rambda REPL
endsWith(target: string, str: string): boolean;
endsWith(target: string): (str: string) => boolean;
export function endsWith(target, str){
if (arguments.length === 1) return _str => endsWith(target, _str)
return str.endsWith(target)
}
import { endsWith } from './endsWith'
test('happy', () => {
expect(endsWith('bar', 'foo-bar')).toBeTrue()
expect(endsWith('baz')('foo-bar')).toBeFalse()
})
test('does not work with arrays', () => {
expect(() => endsWith([ 'c' ], [ 'a', 'b', 'c' ])).toThrow('str.endsWith is not a function')
})
Reason for the failure: rambda doesn't support arrays
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('startsWith', function() {
it('should return true when an array ends with the provided value', function() {
eq(R.endsWith(['c'], ['a', 'b', 'c']), true);
});
it('should return true when an array ends with the provided values', function() {
eq(R.endsWith(['b', 'c'], ['a', 'b', 'c']), true);
});
it('should return false when an array does not end with the provided value', function() {
eq(R.endsWith(['b'], ['a', 'b', 'c']), false);
});
it('should return false when an array does not end with the provided values', function() {
eq(R.endsWith(['a', 'b'], ['a', 'b', 'c']), false);
});
});
equals<T>(a: T, b: T): boolean
It deeply compares a and b and returns true if they are equal.
R.equals(
[1, {a:2}, [{b: 3}]],
[1, {a:2}, [{b: 3}]]
) // => true
Try the above R.equals example in Rambda REPL
equals<T>(a: T, b: T): boolean;
equals<T>(a: T): (b: T) => boolean;
import { type } from './type'
function parseError(maybeError){
const typeofError = maybeError.__proto__.toString()
if (![ 'Error', 'TypeError' ].includes(typeofError)) return []
return [ typeofError, maybeError.message ]
}
function parseDate(maybeDate){
if (!maybeDate.toDateString) return [ false ]
return [ true, maybeDate.getTime() ]
}
function parseRegex(maybeRegex){
if (maybeRegex.constructor !== RegExp) return [ false ]
return [ true, maybeRegex.toString() ]
}
export function equals(a, b){
if (arguments.length === 1) return _b => equals(a, _b)
const aType = type(a)
if (aType !== type(b)) return false
if ([ 'NaN', 'Undefined', 'Null' ].includes(aType)) return true
if ([ 'Boolean', 'Number', 'String' ].includes(aType))
return a.toString() === b.toString()
if (aType === 'Array'){
const aClone = Array.from(a)
const bClone = Array.from(b)
if (aClone.toString() !== bClone.toString()){
return false
}
let loopArrayFlag = true
aClone.forEach((aCloneInstance, aCloneIndex) => {
if (loopArrayFlag){
if (
aCloneInstance !== bClone[ aCloneIndex ] &&
!equals(aCloneInstance, bClone[ aCloneIndex ])
){
loopArrayFlag = false
}
}
})
return loopArrayFlag
}
const aRegex = parseRegex(a)
const bRegex = parseRegex(b)
if (aRegex[ 0 ]){
return bRegex[ 0 ] ? aRegex[ 1 ] === bRegex[ 1 ] : false
} else if (bRegex[ 0 ]) return false
const aDate = parseDate(a)
const bDate = parseDate(b)
if (aDate[ 0 ]){
return bDate[ 0 ] ? aDate[ 1 ] === bDate[ 1 ] : false
} else if (bDate[ 0 ]) return false
const aError = parseError(a)
const bError = parseError(b)
if (aError[ 0 ]){
return bError[ 0 ] ?
aError[ 0 ] === bError[ 0 ] && aError[ 1 ] === bError[ 1 ] :
false
}
if (aType === 'Object'){
const aKeys = Object.keys(a)
if (aKeys.length !== Object.keys(b).length){
return false
}
let loopObjectFlag = true
aKeys.forEach(aKeyInstance => {
if (loopObjectFlag){
const aValue = a[ aKeyInstance ]
const bValue = b[ aKeyInstance ]
if (aValue !== bValue && !equals(aValue, bValue)){
loopObjectFlag = false
}
}
})
return loopObjectFlag
}
return false
}
import { equals } from './equals'
test('happy', () => {
const result = equals([ 1, { a : 1 }, [ { b : 3 } ] ], [ 1, { a : 2 }, [ { b : 3 } ] ])
expect(result).toBeFalse()
})
test('with regex', () => {
expect(equals(/s/, /s/)).toEqual(true)
expect(equals(/s/, /d/)).toEqual(false)
expect(equals(/a/gi, /a/gi)).toEqual(true)
expect(equals(/a/gim, /a/gim)).toEqual(true)
expect(equals(/a/gi, /a/i)).toEqual(false)
})
test('not a number', () => {
expect(equals([ NaN ], [ NaN ])).toBe(true)
})
test('new number', () => {
expect(equals(new Number(0), new Number(0))).toEqual(true)
expect(equals(new Number(0), new Number(1))).toEqual(false)
expect(equals(new Number(1), new Number(0))).toEqual(false)
})
test('new string', () => {
expect(equals(new String(''), new String(''))).toEqual(true)
expect(equals(new String(''), new String('x'))).toEqual(false)
expect(equals(new String('x'), new String(''))).toEqual(false)
expect(equals(new String('foo'), new String('foo'))).toEqual(true)
expect(equals(new String('foo'), new String('bar'))).toEqual(false)
expect(equals(new String('bar'), new String('foo'))).toEqual(false)
})
test('new Boolean', () => {
expect(equals(new Boolean(true), new Boolean(true))).toEqual(true)
expect(equals(new Boolean(false), new Boolean(false))).toEqual(true)
expect(equals(new Boolean(true), new Boolean(false))).toEqual(false)
expect(equals(new Boolean(false), new Boolean(true))).toEqual(false)
})
test('new Error', () => {
expect(equals(new Error('XXX'), {})).toEqual(false)
expect(equals(new Error('XXX'), new TypeError('XXX'))).toEqual(false)
expect(equals(new Error('XXX'), new Error('YYY'))).toEqual(false)
expect(equals(new Error('XXX'), new Error('XXX'))).toEqual(true)
expect(equals(new Error('XXX'), new TypeError('YYY'))).toEqual(false)
})
test('with dates', () => {
expect(equals(new Date(0), new Date(0))).toEqual(true)
expect(equals(new Date(1), new Date(1))).toEqual(true)
expect(equals(new Date(0), new Date(1))).toEqual(false)
expect(equals(new Date(1), new Date(0))).toEqual(false)
expect(equals(new Date(0), {})).toEqual(false)
expect(equals({}, new Date(0))).toEqual(false)
})
test('ramda spec', () => {
expect(equals({}, {})).toEqual(true)
expect(equals({
a : 1,
b : 2,
},
{
a : 1,
b : 2,
})).toEqual(true)
expect(equals({
a : 2,
b : 3,
},
{
b : 3,
a : 2,
})).toEqual(true)
expect(equals({
a : 2,
b : 3,
},
{
a : 3,
b : 3,
})).toEqual(false)
expect(equals({
a : 2,
b : 3,
c : 1,
},
{
a : 2,
b : 3,
})).toEqual(false)
})
test('works with boolean tuple', () => {
expect(equals([ true, false ], [ true, false ])).toBeTrue()
expect(equals([ true, false ], [ true, true ])).toBeFalse()
})
test('works with equal objects within array', () => {
const objFirst = {
a : {
b : 1,
c : 2,
d : [ 1 ],
},
}
const objSecond = {
a : {
b : 1,
c : 2,
d : [ 1 ],
},
}
const x = [ 1, 2, objFirst, null, '', [] ]
const y = [ 1, 2, objSecond, null, '', [] ]
expect(equals(x, y)).toBeTrue()
})
test('works with different objects within array', () => {
const objFirst = { a : { b : 1 } }
const objSecond = { a : { b : 2 } }
const x = [ 1, 2, objFirst, null, '', [] ]
const y = [ 1, 2, objSecond, null, '', [] ]
expect(equals(x, y)).toBeFalse()
})
test('works with undefined as second argument', () => {
expect(equals(1, undefined)).toBeFalse()
expect(equals(undefined, undefined)).toBeTrue()
})
test('various examples', () => {
expect(equals([ 1, 2, 3 ])([ 1, 2, 3 ])).toBeTrue()
expect(equals([ 1, 2, 3 ], [ 1, 2 ])).toBeFalse()
expect(equals(1, 1)).toBeTrue()
expect(equals(1, '1')).toBeFalse()
expect(equals({}, {})).toBeTrue()
expect(equals({
a : 1,
b : 2,
},
{
b : 2,
a : 1,
})).toBeTrue()
expect(equals({
a : 1,
b : 2,
},
{
a : 1,
b : 1,
})).toBeFalse()
expect(equals({
a : 1,
b : false,
},
{
a : 1,
b : 1,
})).toBeFalse()
expect(equals({
a : 1,
b : 2,
},
{
b : 2,
a : 1,
c : 3,
})).toBeFalse()
expect(equals({
x : {
a : 1,
b : 2,
},
},
{
x : {
b : 2,
a : 1,
c : 3,
},
})).toBeFalse()
expect(equals({
a : 1,
b : 2,
},
{
b : 3,
a : 1,
})).toBeFalse()
expect(equals({ a : { b : { c : 1 } } }, { a : { b : { c : 1 } } })).toBeTrue()
expect(equals({ a : { b : { c : 1 } } }, { a : { b : { c : 2 } } })).toBeFalse()
expect(equals({ a : {} }, { a : {} })).toBeTrue()
expect(equals('', '')).toBeTrue()
expect(equals('foo', 'foo')).toBeTrue()
expect(equals('foo', 'bar')).toBeFalse()
expect(equals(0, false)).toBeFalse()
expect(equals(/\s/g, null)).toBeFalse()
expect(equals(null, null)).toBeTrue()
expect(equals(false)(null)).toBeFalse()
})
Reason for the failure: rambda doesn't support recursive data structures, objects with same enumerable properties, map/weakmap type of variables | ramda dispatches to
equalsmethod recursively
/* global Map, Set, WeakMap, WeakSet */
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('equals', function() {
var a = [];
var b = a;
it('never considers Boolean primitive equal to Boolean object', function() {
eq(R.equals(true, new Boolean(true)), false);
eq(R.equals(new Boolean(true), true), false);
eq(R.equals(false, new Boolean(false)), false);
eq(R.equals(new Boolean(false), false), false);
});
it('never considers number primitive equal to Number object', function() {
eq(R.equals(0, new Number(0)), false);
eq(R.equals(new Number(0), 0), false);
});
it('never considers string primitive equal to String object', function() {
eq(R.equals('', new String('')), false);
eq(R.equals(new String(''), ''), false);
eq(R.equals('x', new String('x')), false);
eq(R.equals(new String('x'), 'x'), false);
});
var supportsSticky = false;
try { RegExp('', 'y'); supportsSticky = true; } catch (e) {}
var supportsUnicode = false;
try { RegExp('', 'u'); supportsUnicode = true; } catch (e) {}
var listA = [1, 2, 3];
var listB = [1, 3, 2];
var c = {}; c.v = c;
var d = {}; d.v = d;
var e = []; e.push(e);
var f = []; f.push(f);
var nestA = {a:[1, 2, {c:1}], b:1};
var nestB = {a:[1, 2, {c:1}], b:1};
var nestC = {a:[1, 2, {c:2}], b:1};
it('handles recursive data structures', function() {
eq(R.equals(c, d), true);
eq(R.equals(e, f), true);
eq(R.equals(nestA, nestB), true);
eq(R.equals(nestA, nestC), false);
});
it('requires that both objects have the same enumerable properties with the same values', function() {
var a1 = [];
var a2 = [];
a2.x = 0;
var b1 = new Boolean(false);
var b2 = new Boolean(false);
b2.x = 0;
var d1 = new Date(0);
var d2 = new Date(0);
d2.x = 0;
var n1 = new Number(0);
var n2 = new Number(0);
n2.x = 0;
var r1 = /(?:)/;
var r2 = /(?:)/;
r2.x = 0;
var s1 = new String('');
var s2 = new String('');
s2.x = 0;
eq(R.equals(a1, a2), false);
eq(R.equals(b1, b2), false);
eq(R.equals(d1, d2), false);
eq(R.equals(n1, n2), false);
eq(R.equals(r1, r2), false);
eq(R.equals(s1, s2), false);
});
if (typeof ArrayBuffer !== 'undefined' && typeof Int8Array !== 'undefined') {
var typArr1 = new ArrayBuffer(10);
typArr1[0] = 1;
var typArr2 = new ArrayBuffer(10);
typArr2[0] = 1;
var typArr3 = new ArrayBuffer(10);
var intTypArr = new Int8Array(typArr1);
typArr3[0] = 0;
it('handles typed arrays', function() {
eq(R.equals(typArr1, typArr2), true);
eq(R.equals(typArr1, typArr3), false);
eq(R.equals(typArr1, intTypArr), false);
});
}
if (typeof Promise !== 'undefined') {
it('compares Promise objects by identity', function() {
var p = Promise.resolve(42);
var q = Promise.resolve(42);
eq(R.equals(p, p), true);
eq(R.equals(p, q), false);
});
}
if (typeof Map !== 'undefined') {
it('compares Map objects by value', function() {
eq(R.equals(new Map([]), new Map([])), true);
eq(R.equals(new Map([]), new Map([[1, 'a']])), false);
eq(R.equals(new Map([[1, 'a']]), new Map([])), false);
eq(R.equals(new Map([[1, 'a']]), new Map([[1, 'a']])), true);
eq(R.equals(new Map([[1, 'a'], [2, 'b']]), new Map([[2, 'b'], [1, 'a']])), true);
eq(R.equals(new Map([[1, 'a']]), new Map([[2, 'a']])), false);
eq(R.equals(new Map([[1, 'a']]), new Map([[1, 'b']])), false);
eq(R.equals(new Map([[1, 'a'], [2, new Map([[3, 'c']])]]), new Map([[1, 'a'], [2, new Map([[3, 'c']])]])), true);
eq(R.equals(new Map([[1, 'a'], [2, new Map([[3, 'c']])]]), new Map([[1, 'a'], [2, new Map([[3, 'd']])]])), false);
eq(R.equals(new Map([[[1, 2, 3], [4, 5, 6]]]), new Map([[[1, 2, 3], [4, 5, 6]]])), true);
eq(R.equals(new Map([[[1, 2, 3], [4, 5, 6]]]), new Map([[[1, 2, 3], [7, 8, 9]]])), false);
});
it('dispatches to `equals` method recursively in Set', function() {
var a = new Map();
var b = new Map();
a.set(a, a);
eq(R.equals(a, b), false);
a.set(b, b);
b.set(b, b);
b.set(a, a);
eq(R.equals(a, b), true);
});
}
if (typeof Set !== 'undefined') {
it('compares Set objects by value', function() {
eq(R.equals(new Set([]), new Set([])), true);
eq(R.equals(new Set([]), new Set([1])), false);
eq(R.equals(new Set([1]), new Set([])), false);
eq(R.equals(new Set([1, 2]), new Set([2, 1])), true);
eq(R.equals(new Set([1, new Set([2, new Set([3])])]), new Set([1, new Set([2, new Set([3])])])), true);
eq(R.equals(new Set([1, new Set([2, new Set([3])])]), new Set([1, new Set([2, new Set([4])])])), false);
eq(R.equals(new Set([[1, 2, 3], [4, 5, 6]]), new Set([[1, 2, 3], [4, 5, 6]])), true);
eq(R.equals(new Set([[1, 2, 3], [4, 5, 6]]), new Set([[1, 2, 3], [7, 8, 9]])), false);
});
it('dispatches to `equals` method recursively in Set', function() {
var a = new Set();
var b = new Set();
a.add(a);
eq(R.equals(a, b), false);
a.add(b);
b.add(b);
b.add(a);
eq(R.equals(a, b), true);
});
}
if (typeof WeakMap !== 'undefined') {
it('compares WeakMap objects by identity', function() {
var m = new WeakMap([]);
eq(R.equals(m, m), true);
eq(R.equals(m, new WeakMap([])), false);
});
}
if (typeof WeakSet !== 'undefined') {
it('compares WeakSet objects by identity', function() {
var s = new WeakSet([]);
eq(R.equals(s, s), true);
eq(R.equals(s, new WeakSet([])), false);
});
}
it('dispatches to `equals` method recursively', function() {
function Left(x) { this.value = x; }
Left.prototype.equals = function(x) {
return x instanceof Left && R.equals(x.value, this.value);
};
function Right(x) { this.value = x; }
Right.prototype.equals = function(x) {
return x instanceof Right && R.equals(x.value, this.value);
};
eq(R.equals(new Left([42]), new Left([42])), true);
eq(R.equals(new Left([42]), new Left([43])), false);
eq(R.equals(new Left(42), {value: 42}), false);
eq(R.equals({value: 42}, new Left(42)), false);
eq(R.equals(new Left(42), new Right(42)), false);
eq(R.equals(new Right(42), new Left(42)), false);
eq(R.equals([new Left(42)], [new Left(42)]), true);
eq(R.equals([new Left(42)], [new Right(42)]), false);
eq(R.equals([new Right(42)], [new Left(42)]), false);
eq(R.equals([new Right(42)], [new Right(42)]), true);
});
});
F(): boolean
F() // => false
Try the above R.F example in Rambda REPL
F(): boolean;
export function F(){
return false
}
filter<T>(predicate: FilterFunctionArray<T>): (x: T[]) => T[]
It filters list or object input with predicate.
const list = [3, 4, 3, 2]
const listPredicate = (x, index) => x - index > 2
const object = {abc: 'fo', xyz: 'bar', baz: 'foo'}
const objectPredicate = (x, prop) => x.length + prop.length > 5
const result = [
R.filter(listPredicate, list),
R.filter(objectPredicate, object)
]
// => [ [3, 4], { xyz: 'bar', baz: 'foo'} ]
Try the above R.filter example in Rambda REPL
filter<T>(predicate: FilterFunctionArray<T>): (x: T[]) => T[];
filter<T>(predicate: FilterFunctionArray<T>, x: T[]): T[];
filter<T, U>(predicate: FilterFunctionObject<T>): (x: Dictionary<T>) => Dictionary<T>;
filter<T>(predicate: FilterFunctionObject<T>, x: Dictionary<T>): Dictionary<T>;
function filterObject(fn, obj){
const willReturn = {}
for (const prop in obj){
if (fn(
obj[ prop ], prop, obj
)){
willReturn[ prop ] = obj[ prop ]
}
}
return willReturn
}
export function filter(predicate, list){
if (arguments.length === 1) return _list => filter(predicate, _list)
if (!list) return []
if (!Array.isArray(list)){
return filterObject(predicate, list)
}
let index = -1
let resIndex = 0
const len = list.length
const willReturn = []
while (++index < len){
const value = list[ index ]
if (predicate(value, index)){
willReturn[ resIndex++ ] = value
}
}
return willReturn
}
import Ramda from 'ramda'
import { filter } from './filter'
import { T } from './T'
import { F } from './F'
const sampleObject = {
a : 1,
b : 2,
c : 3,
d : 4,
}
test('happy', () => {
const isEven = n => n % 2 === 0
expect(filter(isEven, [ 1, 2, 3, 4 ])).toEqual([ 2, 4 ])
expect(filter(isEven, {
a : 1,
b : 2,
d : 3,
})).toEqual({ b : 2 })
})
test('bad inputs', () => {
expect(filter(T)(undefined)).toEqual([])
expect(filter(F, null)).toEqual([])
expect(() => Ramda.filter(T, null)).toThrow()
expect(() => Ramda.filter(T, undefined)).toThrow()
})
test('predicate when input is object', () => {
const obj = {
a : 1,
b : 2,
}
const predicate = (
val, prop, inputObject
) => {
expect(inputObject).toEqual(obj)
expect(typeof prop).toEqual('string')
return val < 2
}
expect(filter(predicate, obj)).toEqual({ a : 1 })
})
test('pass index as second argument', () => {
let counter = 0
filter((x, i) => {
expect(i).toBe(counter)
counter++
},
[ 10, 20, 30 ])
})
test('with object', () => {
const isEven = n => n % 2 === 0
const result = filter(isEven, sampleObject)
const expectedResult = {
b : 2,
d : 4,
}
expect(result).toEqual(expectedResult)
})
import {filter} from 'rambda'
describe('filter with array', () => {
it('1 curry', () => {
const x = filter<number>(a => {
a // $ExpectType number
return a > 1
})([1, 2, 3])
x // $ExpectType number[]
})
it('1', () => {
const x = filter<number>(
a => {
a // $ExpectType number
return a > 1
},
[1, 2, 3]
)
x // $ExpectType number[]
})
it('2', () => {
const x = filter<number>(
(a, b) => {
a // $ExpectType number
return a > 1
},
[1, 2, 3]
)
x // $ExpectType number[]
})
})
describe('filter with objects', () => {
it('curry', () => {
const x = filter<number, number>((a, b, c) => {
b // $ExpectType string
c // $ExpectType Dictionary<number>
return a > 1
})({a: 1, b: 2})
x // $ExpectType Dictionary<number>
})
it('object with three arguments predicate', () => {
const x = filter<number>(
(a, b, c) => {
b // $ExpectType string
c // $ExpectType Dictionary<number>
return a > 1
},
{a: 1, b: 2}
)
x // $ExpectType Dictionary<number>
})
it('object with two arguments predicate', () => {
const x = filter<number>(
(a, b) => {
b // $ExpectType string
return a > 1
},
{a: 1, b: 2}
)
x // $ExpectType Dictionary<number>
})
it('object with one argument predicate', () => {
const x = filter<number>(
a => {
a // $ExpectType number
return a > 1
},
{a: 1, b: 2}
)
x // $ExpectType Dictionary<number>
})
})
Reason for the failure: ramda dispatches to
filtermethod of object
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
var Maybe = require('./shared/Maybe');
describe('filter', function() {
var even = function(x) {return x % 2 === 0;};
it('dispatches to passed-in non-Array object with a `filter` method', function() {
var f = {filter: function(f) { return f('called f.filter'); }};
eq(R.filter(function(s) { return s; }, f), 'called f.filter');
});
it('correctly uses fantasy-land implementations', function() {
var m1 = Maybe.Just(-1);
var m2 = R.filter(function(x) { return x > 0; } , m1);
eq(m2.isNothing, true);
});
});
find<T>(predicate: (a: T) => boolean, arr: ReadonlyArray<T>): T | undefined
It returns the first element of list that satisfy the predicate.
If there is no such element, it returns undefined.
const predicate = x => R.type(x.foo) === 'Number'
const list = [{foo: 'bar'}, {foo: 1}]
const result = R.find(predicate, list)
// => {foo: 1}
Try the above R.find example in Rambda REPL
find<T>(predicate: (a: T) => boolean, arr: ReadonlyArray<T>): T | undefined;
find<T>(predicate: (a: T) => boolean): (arr: ReadonlyArray<T>) => T | undefined;
export function find(predicate, list){
if (arguments.length === 1) return _list => find(predicate, _list)
return list.find(predicate)
}
import { find } from './find'
import { propEq } from './propEq'
test('happy', () => {
expect(find(propEq('a', 2), [ { a : 1 }, { a : 2 }, { a : 3 } ])).toEqual({ a : 2 })
})
test('with curry', () => {
expect(find(propEq('a', 4))([ { a : 1 }, { a : 2 }, { a : 3 } ])).toEqual(undefined)
})
findIndex<T>(findFn: (a: T) => boolean, arr: ReadonlyArray<T>): number
It returns the index of the first element of list satisfying the predicate function.
If there is no such element, then -1 is returned.
const predicate = x => R.type(x.foo) === 'Number'
const list = [{foo: 'bar'}, {foo: 1}]
const result = R.findIndex(predicate, list)
// => 1
Try the above R.findIndex example in Rambda REPL
findIndex<T>(findFn: (a: T) => boolean, arr: ReadonlyArray<T>): number;
findIndex<T>(findFn: (a: T) => boolean): (arr: ReadonlyArray<T>) => number;
export function findIndex(predicate, list){
if (arguments.length === 1) return _list => findIndex(predicate, _list)
const len = list.length
let index = -1
while (++index < len){
if (predicate(list[ index ], index)){
return index
}
}
return -1
}
import { findIndex } from './findIndex'
import { propEq } from './propEq'
test('happy', () => {
expect(findIndex(propEq('a', 2))([ { a : 1 }, { a : 2 }, { a : 3 } ])).toEqual(1)
expect(findIndex(propEq('a', 1))([ { a : 1 }, { a : 2 }, { a : 3 } ])).toEqual(0)
expect(findIndex(propEq('a', 4))([ { a : 1 }, { a : 2 }, { a : 3 } ])).toEqual(-1)
})
test('pass index as second argument', () => {
findIndex((x, i) => {
expect(typeof x).toBe('number')
expect(typeof i).toBe('number')
})([ 10, 12, 15 ])
})
findLast<T>(fn: (a: T) => boolean, list: T[]): T | undefined
It returns the last element of list satisfying the predicate function.
If there is no such element, then undefined is returned.
const predicate = x => R.type(x.foo) === 'Number'
const list = [{foo: 0}, {foo: 1}]
const result = R.findLast(predicate, list)
// => {foo: 1}
Try the above R.findLast example in Rambda REPL
findLast<T>(fn: (a: T) => boolean, list: T[]): T | undefined;
findLast<T>(fn: (a: T) => boolean): (list: T[]) => T | undefined;
export function findLast(predicate, list){
if (arguments.length === 1) return _list => findLast(predicate, _list)
let index = list.length
while (--index >= 0){
if (predicate(list[ index ], index)){
return list[ index ]
}
}
return undefined
}
import { findLast } from './findLast'
test('happy', () => {
const result = findLast((x, i) => {
expect(typeof i).toBe('number')
return x > 1
},
[ 1, 1, 1, 2, 3, 4, 1 ])
expect(result).toEqual(4)
expect(findLast(x => x === 0, [ 0, 1, 1, 2, 3, 4, 1 ])).toEqual(0)
})
test('with curry', () => {
expect(findLast(x => x > 1)([ 1, 1, 1, 2, 3, 4, 1 ])).toEqual(4)
})
const obj1 = { x : 100 }
const obj2 = { x : 200 }
const a = [ 11, 10, 9, 'cow', obj1, 8, 7, 100, 200, 300, obj2, 4, 3, 2, 1, 0 ]
const even = function (x){
return x % 2 === 0
}
const gt100 = function (x){
return x > 100
}
const isStr = function (x){
return typeof x === 'string'
}
const xGt100 = function (o){
return o && o.x > 100
}
test('ramda 1', () => {
expect(findLast(even, a)).toEqual(0)
expect(findLast(gt100, a)).toEqual(300)
expect(findLast(isStr, a)).toEqual('cow')
expect(findLast(xGt100, a)).toEqual(obj2)
})
test('ramda 2', () => {
expect(findLast(even, [ 'zing' ])).toEqual(undefined)
})
test('ramda 3', () => {
expect(findLast(even, [ 2, 3, 5 ])).toEqual(2)
})
test('ramda 4', () => {
expect(findLast(even, [])).toEqual(undefined)
})
findLastIndex<T>(fn: (a: T) => boolean, list: T[]): number
It returns the index of the last element of list satisfying the predicate function.
If there is no such element, then -1 is returned.
const predicate = x => R.type(x.foo) === 'Number'
const list = [{foo: 0}, {foo: 1}]
const result = R.findLastIndex(predicate, list)
// => 1
Try the above R.findLastIndex example in Rambda REPL
findLastIndex<T>(fn: (a: T) => boolean, list: T[]): number;
findLastIndex<T>(fn: (a: T) => boolean): (list: T[]) => number;
export function findLastIndex(fn, list){
if (arguments.length === 1) return _list => findLastIndex(fn, _list)
let index = list.length
while (--index >= 0){
if (fn(list[ index ], index)){
return index
}
}
return -1
}
import { findLastIndex } from './findLastIndex'
test('happy', () => {
const result = findLastIndex((x, i) => {
expect(typeof i).toBe('number')
return x > 1
},
[ 1, 1, 1, 2, 3, 4, 1 ])
expect(result).toEqual(5)
expect(findLastIndex(x => x === 0, [ 0, 1, 1, 2, 3, 4, 1 ])).toEqual(0)
})
test('with curry', () => {
expect(findLastIndex(x => x > 1)([ 1, 1, 1, 2, 3, 4, 1 ])).toEqual(5)
})
const obj1 = { x : 100 }
const obj2 = { x : 200 }
const a = [ 11, 10, 9, 'cow', obj1, 8, 7, 100, 200, 300, obj2, 4, 3, 2, 1, 0 ]
const even = function (x){
return x % 2 === 0
}
const gt100 = function (x){
return x > 100
}
const isStr = function (x){
return typeof x === 'string'
}
const xGt100 = function (o){
return o && o.x > 100
}
test('ramda 1', () => {
expect(findLastIndex(even, a)).toEqual(15)
expect(findLastIndex(gt100, a)).toEqual(9)
expect(findLastIndex(isStr, a)).toEqual(3)
expect(findLastIndex(xGt100, a)).toEqual(10)
})
test('ramda 2', () => {
expect(findLastIndex(even, [ 'zing' ])).toEqual(-1)
})
test('ramda 3', () => {
expect(findLastIndex(even, [ 2, 3, 5 ])).toEqual(0)
})
test('ramda 4', () => {
expect(findLastIndex(even, [])).toEqual(-1)
})
flatten<T>(x: ReadonlyArray<T> | ReadonlyArray<T[]> | ReadonlyArray<ReadonlyArray<T>>): T[]
It deeply flattens an array.
const result = R.flatten([
1,
2,
[3, 30, [300]],
[4]
])
// => [ 1, 2, 3, 30, 300, 4 ]
Try the above R.flatten example in Rambda REPL
flatten<T>(x: ReadonlyArray<T> | ReadonlyArray<T[]> | ReadonlyArray<ReadonlyArray<T>>): T[];
export function flatten(list, input){
const willReturn = input === undefined ? [] : input
for (let i = 0; i < list.length; i++){
if (Array.isArray(list[ i ])){
flatten(list[ i ], willReturn)
} else {
willReturn.push(list[ i ])
}
}
return willReturn
}
import { flatten } from './flatten'
test('happy', () => {
expect(flatten([ 1, 2, 3, [ [ [ [ [ 4 ] ] ] ] ] ])).toEqual([ 1, 2, 3, 4 ])
expect(flatten([ 1, [ 2, [ [ 3 ] ] ], [ 4 ] ])).toEqual([ 1, 2, 3, 4 ])
expect(flatten([ 1, [ 2, [ [ [ 3 ] ] ] ], [ 4 ] ])).toEqual([ 1, 2, 3, 4 ])
expect(flatten([ 1, 2, [ 3, 4 ], 5, [ 6, [ 7, 8, [ 9, [ 10, 11 ], 12 ] ] ] ])).toEqual([ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ])
})
test('readme example', () => {
const result = flatten([ 1, 2, [ 3, 30, [ 300 ] ], [ 4 ] ])
expect(result).toEqual([ 1, 2, 3, 30, 300, 4 ])
})
flip<T, U, TResult>(fn: (arg0: T, arg1: U) => TResult): (arg1: U, arg0?: T) => TResult
It returns function which calls fn with exchanged first and second argument.
const subtractFlip = R.flip(R.subtract)
const result = [
subtractFlip(1,7),
R.flip(1,6)
]
// => [6, -6]
Try the above R.flip example in Rambda REPL
flip<T, U, TResult>(fn: (arg0: T, arg1: U) => TResult): (arg1: U, arg0?: T) => TResult;
function flipExport(fn){
return (...input) => {
if (input.length === 1){
return holder => fn(holder, input[ 0 ])
} else if (input.length === 2){
return fn(input[ 1 ], input[ 0 ])
}
return undefined
}
}
export function flip(fn){
return flipExport(fn)
}
import { flip } from './flip'
import { subtract } from './subtract'
test('flip', () => {
const fn = flip(subtract)
expect(fn(1)(7)).toEqual(6)
expect(fn(1, 7)).toEqual(6)
expect(fn(
1, 7, 9
)).toEqual(undefined)
})
Reason for the failure: rambda flip work only for functions with two arguments
var jsv = require('jsverify');
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
var funcN = require('./shared/funcN');
describe('flip', function() {
it('returns a function which inverts the first two arguments to the supplied function', function() {
var f = function(a, b, c) {return a + ' ' + b + ' ' + c;};
var g = R.flip(f);
eq(f('a', 'b', 'c'), 'a b c');
eq(g('a', 'b', 'c'), 'b a c');
});
it('returns a curried function', function() {
var f = function(a, b, c) {return a + ' ' + b + ' ' + c;};
var g = R.flip(f)('a');
eq(g('b', 'c'), 'b a c');
});
it('returns a function with the correct arity', function() {
var f2 = function(a, b) {return a + ' ' + b;};
var f3 = function(a, b, c) {return a + ' ' + b + ' ' + c;};
eq(R.flip(f2).length, 2);
eq(R.flip(f3).length, 3);
});
});
describe('flip properties', function() {
jsv.property('inverts first two arguments', funcN(3), jsv.json, jsv.json, jsv.json, function(f, a, b, c) {
var g = R.flip(f);
return R.equals(f(a, b, c), g(b, a, c));
});
});
forEach<T>(fn: (x: T) => void, list: T[]): T[]
It applies iterable function over all members of list and returns list.
const sideEffect = {}
const result = R.forEach(
x => sideEffect[`foo${x}`] = x
)([1, 2])
sideEffect //=> {foo1: 1, foo2: 2}
result //=> [1, 2]
Try the above R.forEach example in Rambda REPL
forEach<T>(fn: (x: T) => void, list: T[]): T[];
forEach<T>(fn: (x: T) => void): (list: T[]) => T[];
forEach<T>(fn: (x: T) => void, list: ReadonlyArray<T>): ReadonlyArray<T>;
forEach<T>(fn: (x: T) => void): (list: ReadonlyArray<T>) => ReadonlyArray<T>;
forEach<T>(fn: (value: T, key: string, obj: { [key: string]: T }) => void, obj: { [key: string]: T }): void;
forEach<T>(fn: (value: T, key: string, obj: { [key: string]: T }) => void): (obj: { [key: string]: T }) => void;
import { map } from './map'
export function forEach(predicate, list){
if (arguments.length === 1) return _list => forEach(predicate, _list)
map(predicate, list)
return list
}
import { forEach } from './forEach'
import { type } from './type'
test('iterate over object', () => {
const obj = {
a : 1,
b : [ 1, 2 ],
c : { d : 7 },
f : 'foo',
}
const result = {}
const returned = forEach((
val, prop, inputObj
) => {
expect(type(inputObj)).toBe('Object')
result[ prop ] = `${ prop }-${ type(val) }`
})(obj)
const expected = {
a : 'a-Number',
b : 'b-Array',
c : 'c-Object',
f : 'f-String',
}
expect(result).toEqual(expected)
expect(returned).toEqual(obj)
})
test('happy', () => {
const sideEffect = {}
forEach(x => sideEffect[ `foo${ x }` ] = x + 10)([ 1, 2 ])
expect(sideEffect).toEqual({
foo1 : 11,
foo2 : 12,
})
})
test('happy 2', () => {
const list = [
{
x : 1,
y : 2,
},
{
x : 100,
y : 200,
},
{
x : 300,
y : 400,
},
{
x : 234,
y : 345,
},
]
const sideEffect = {}
const result = forEach(elem => {
sideEffect[ elem.x ] = elem.y
}, list)
const expectedSideEffect = {
1 : 2,
100 : 200,
300 : 400,
234 : 345,
}
expect(sideEffect).toEqual(expectedSideEffect)
expect(result).toEqual(list)
})
test('with empty list', () => {
const list = []
const result = forEach(x => x * x)(list)
expect(result).toEqual(list)
})
test('returns the input', () => {
const list = [ 1, 2, 3 ]
const result = forEach(x => x * x)(list)
expect(result).toEqual(list)
})
test('pass index as second argument', () => {
const list = [ 11, 21, 31 ]
const indexes = []
const result = forEach((x, i) => indexes.push(i))(list)
expect(indexes).toEqual([ 0, 1, 2 ])
})
Reason for the failure: ramda method dispatches to
forEachmethod
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('forEach', function() {
var list = [{x: 1, y: 2}, {x: 100, y: 200}, {x: 300, y: 400}, {x: 234, y: 345}];
it('dispatches to `forEach` method', function() {
var dispatched = false;
var fn = function() {};
function DummyList() {}
DummyList.prototype.forEach = function(callback) {
dispatched = true;
eq(callback, fn);
};
R.forEach(fn, new DummyList());
eq(dispatched, true);
});
});
fromPairs<V>(listOfPairs: KeyValuePair<string, V>[]): { [index: string]: V }
It transforms a listOfPairs to an object.
const listOfPairs = [ [ 'a', 1 ], [ 'b', 2 ], [ 'c', [ 3, 4 ] ] ]
const expected = {
a : 1,
b : 2,
c : [ 3, 4 ],
}
const result = R.fromPairs(listOfPairs)
// => `result` is equal to `expected`
Try the above R.fromPairs example in Rambda REPL
fromPairs<V>(listOfPairs: KeyValuePair<string, V>[]): { [index: string]: V };
fromPairs<V>(listOfPairs: KeyValuePair<number, V>[]): { [index: number]: V };
export function fromPairs(listOfPairs){
const toReturn = {}
listOfPairs.forEach(([ prop, value ]) => toReturn[ prop ] = value)
return toReturn
}
import { fromPairs } from './fromPairs'
const list = [
[ 'a', 1 ],
[ 'b', 2 ],
[ 'c', [ 3, 4 ] ],
]
const expected = {
a : 1,
b : 2,
c : [ 3, 4 ],
}
test('happy', () => {
expect(fromPairs(list)).toEqual(expected)
})
groupBy<T>(groupFn: (a: T) => string, list: ReadonlyArray<T>): { [index: string]: T[] }
It splits list according to a provided groupFn function and returns an object.
const list = [ 'a', 'b', 'aa', 'bb' ]
const groupFn = x => x.length
const result = R.groupBy(groupFn, list)
// => { '1': ['a', 'b'], '2': ['aa', 'bb'] }
Try the above R.groupBy example in Rambda REPL
groupBy<T>(groupFn: (a: T) => string, list: ReadonlyArray<T>): { [index: string]: T[] };
groupBy<T>(groupFn: (a: T) => string): (list: ReadonlyArray<T>) => { [index: string]: T[] };
export function groupBy(groupFn, list){
if (arguments.length === 1) return _list => groupBy(groupFn, _list)
const result = {}
for (let i = 0; i < list.length; i++){
const item = list[ i ]
const key = groupFn(item)
if (!result[ key ]){
result[ key ] = []
}
result[ key ].push(item)
}
return result
}
import { groupBy } from './groupBy'
import { prop } from './prop'
test('groupBy', () => {
const list = [
{
age : 12,
name : 'john',
},
{
age : 12,
name : 'jack',
},
{
age : 24,
name : 'mary',
},
{
age : 24,
name : 'steve',
},
]
const expectedResult = {
12 : [
{
age : 12,
name : 'john',
},
{
age : 12,
name : 'jack',
},
],
24 : [
{
age : 24,
name : 'mary',
},
{
age : 24,
name : 'steve',
},
],
}
expect(groupBy(prop('age'))(list)).toEqual(expectedResult)
expect(groupBy(prop('age'), list)).toEqual(expectedResult)
})
Reason for the failure: ramda support transforms
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
var _isTransformer = require('rambda/internal/_isTransformer');
describe('groupBy', function() {
it('dispatches on transformer objects in list position', function() {
var byType = R.prop('type');
var xf = {
'@@transducer/init': function() { return {}; },
'@@transducer/result': function(x) { return x; },
'@@transducer/step': R.mergeRight
};
eq(_isTransformer(R.groupBy(byType, xf)), true);
});
});
groupWith<T>(compareFn: (x: T, y: T) => boolean): (list: ReadonlyArray<T>) => T[][]
It returns separated version of list, where separation is done with equality compareFn function.
const compareFn = (x, y) => x === y
const list = [1, 2, 2, 1, 1, 2]
const result = R.groupWith(isConsecutive, list)
// => [[1], [2,2], [1,1], [2]]
Try the above R.groupWith example in Rambda REPL
groupWith<T>(compareFn: (x: T, y: T) => boolean): (list: ReadonlyArray<T>) => T[][];
groupWith<T>(compareFn: (x: T, y: T) => boolean, list: ReadonlyArray<T>): T[][];
groupWith<T>(compareFn: (x: T, y: T) => boolean, list: string): string[];
export function groupWith(compareFn, list){
if (!Array.isArray(list))
throw new TypeError('list.reduce is not a function')
const clone = list.slice()
const toReturn = []
let holder = []
clone.reduce((
prev, current, i
) => {
if (i === 0) return current
const okCompare = compareFn(prev, current)
const holderIsEmpty = holder.length === 0
const lastCall = i === list.length - 1
if (okCompare){
if (holderIsEmpty) holder.push(prev)
holder.push(current)
if (lastCall) toReturn.push(holder)
return current
}
if (holderIsEmpty){
toReturn.push([ prev ])
if (lastCall) toReturn.push([ current ])
return current
}
toReturn.push(holder)
if (lastCall) toReturn.push([ current ])
holder = []
return current
}, undefined)
return toReturn
}
import { equals } from './equals'
import { groupWith } from './groupWith'
test('issue is fixed', () => {
const result = groupWith(equals, [ 1, 2, 2, 3 ])
const expected = [ [ 1 ], [ 2, 2 ], [ 3 ] ]
expect(result).toEqual(expected)
})
test('long list', () => {
const result = groupWith(equals, [
0,
1,
1,
2,
3,
5,
8,
13,
21,
21,
21,
1,
2,
])
const expected = [
[ 0 ],
[ 1, 1 ],
[ 2 ],
[ 3 ],
[ 5 ],
[ 8 ],
[ 13 ],
[ 21, 21, 21 ],
[ 1 ],
[ 2 ],
]
expect(result).toEqual(expected)
})
test('readme example', () => {
const list = [ 4, 3, 6, 2, 2, 1 ]
const result = groupWith((a, b) => a - b === 1, list)
const expected = [ [ 4, 3 ], [ 6 ], [ 2 ], [ 2, 1 ] ]
expect(result).toEqual(expected)
})
test('throw with string as input', () => {
expect(() => groupWith(equals, 'Mississippi')).toThrowWithMessage(TypeError,
'list.reduce is not a function')
})
const isConsecutive = function (a, b){
return a + 1 === b
}
test('fix coverage', () => {
expect(groupWith(isConsecutive, [ 1, 2, 3, 0 ])).toEqual([ [ 1, 2, 3 ], [ 0 ] ])
})
test('from ramda 0', () => {
expect(groupWith(equals, [])).toEqual([])
expect(groupWith(isConsecutive, [])).toEqual([])
})
test('from ramda 1', () => {
expect(groupWith(isConsecutive, [ 4, 3, 2, 1 ])).toEqual([
[ 4 ],
[ 3 ],
[ 2 ],
[ 1 ],
])
})
test('from ramda 2', () => {
expect(groupWith(isConsecutive, [ 1, 2, 3, 4 ])).toEqual([ [ 1, 2, 3, 4 ] ])
})
test('from ramda 3', () => {
expect(groupWith(isConsecutive, [ 1, 2, 2, 3 ])).toEqual([
[ 1, 2 ],
[ 2, 3 ],
])
expect(groupWith(isConsecutive, [ 1, 2, 9, 3, 4 ])).toEqual([
[ 1, 2 ],
[ 9 ],
[ 3, 4 ],
])
})
has<T>(prop: string, obj: T): boolean
It returns true if obj has property prop.
const obj = {a: 1}
const result = [
R.has('a', obj),
R.has('b', obj)
]
// => [true, false]
Try the above R.has example in Rambda REPL
has<T>(prop: string, obj: T): boolean;
has(prop: string): <T>(obj: T) => boolean;
export function has(prop, obj){
if (arguments.length === 1) return _obj => has(prop, _obj)
if (!obj) return false
return obj[ prop ] !== undefined
}
import { has } from './has'
test('happy', () => {
expect(has('a')({ a : 1 })).toBeTrue()
expect(has('b', { a : 1 })).toBeFalse()
})
test('with non-object', () => {
expect(has('a', undefined)).toEqual(false)
expect(has('a', null)).toEqual(false)
expect(has('a', true)).toEqual(false)
expect(has('a', '')).toEqual(false)
expect(has('a', /a/)).toEqual(false)
})
Reason for the failure: rambda does check properties from the prototype chain
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('has', function() {
var fred = {name: 'Fred', age: 23};
var anon = {age: 99};
it('does not check properties from the prototype chain', function() {
var Person = function() {};
Person.prototype.age = function() {};
var bob = new Person();
eq(R.has('age', bob), false);
});
});
head<T>(listOrString: T[]): T | undefined
It returns the first element of listOrString.
const result = [
R.head([1, 2, 3]),
R.head('foo')
]
// => [1, 'f']
Try the above R.head example in Rambda REPL
head<T>(listOrString: T[]): T | undefined;
head(listOrString: string): string;
export function head(listOrString){
if (typeof listOrString === 'string') return listOrString[ 0 ] || ''
return listOrString[ 0 ]
}
import { head } from './head'
test('head', () => {
expect(head([ 'fi', 'fo', 'fum' ])).toEqual('fi')
expect(head([])).toEqual(undefined)
expect(head('foo')).toEqual('f')
expect(head('')).toEqual('')
})
identical<T>(a: T, b: T): boolean
It returns true if its arguments a and b are identical.
Otherwise, it returns false.
const obj = {a: 1};
R.identical(obj, obj); //=> true
R.identical(1, 1); //=> true
R.identical(1, '1'); //=> false
R.identical([], []); //=> false
R.identical(0, -0); //=> false
R.identical(NaN, NaN); //=> true
Try the above R.identical example in Rambda REPL
identical<T>(a: T, b: T): boolean;
identical<T>(a: T): (b: T) => boolean;
import _objectIs from './_internals/_objectIs'
export function identical(a, b){
if (arguments.length === 1) return _b => identical(a, _b)
return _objectIs(a, b)
}
import { F, T } from '../rambda.js'
import { _isInteger } from './_internals/_isInteger'
import { _objectIs } from './_internals/_objectIs'
import { identical } from './identical'
test('with boolean', () => {
expect(F()).toBe(false)
expect(T()).toBe(true)
})
test('internal isInteger', () => {
expect(_isInteger(1)).toBe(true)
expect(_isInteger(0.3)).toBe(false)
})
test('internal objectIs', () => {
expect(_objectIs(1, 1)).toBe(true)
expect(_objectIs(NaN, NaN)).toBe(true)
})
test('identical', () => {
const a = {}
expect(identical(100)(100)).toEqual(true)
expect(identical(100, '100')).toEqual(false)
expect(identical('string', 'string')).toEqual(true)
expect(identical([], [])).toEqual(false)
expect(identical(a, a)).toEqual(true)
expect(identical(undefined, undefined)).toEqual(true)
expect(identical(null, undefined)).toEqual(false)
})
identity<T>(input: T): T
It just passes back the supplied input argument.
R.identity(7) // => 7
Try the above R.identity example in Rambda REPL
identity<T>(input: T): T;
export function identity(input){
return input
}
import { identity } from './identity'
test('happy', () => {
expect(identity(7)).toEqual(7)
expect(identity(true)).toEqual(true)
expect(identity({ a : 1 })).toEqual({ a : 1 })
})
ifElse(condition: Pred, onTrue: Arity1Fn, onFalse: Arity1Fn): Arity1Fn
It expects condition, onTrue and onFalse functions as inputs and it returns a new function with example name of fn.
When fn`` is called with inputargument, it will return eitheronTrue(input)oronFalse(input)depending oncondition(input)` evaluation.
const fn = R.ifElse(
x => x>10,
x => x*2,
x => x*10
)
const result = [ fn(8), fn(18) ]
// => [80, 36]
Try the above R.ifElse example in Rambda REPL
ifElse(condition: Pred, onTrue: Arity1Fn, onFalse: Arity1Fn): Arity1Fn;
ifElse(condition: Pred, onTrue: Arity2Fn, onFalse: Arity2Fn): Arity2Fn;
import { curry } from './curry'
function ifElseFn(
condition, onTrue, onFalse
){
return (...input) => {
const conditionResult =
typeof condition === 'boolean' ? condition : condition(...input)
if (conditionResult === true){
return onTrue(...input)
}
return onFalse(...input)
}
}
export const ifElse = curry(ifElseFn)
import { always } from './always.js'
import { has } from './has'
import { identity } from './identity'
import { ifElse } from './ifElse'
import { prop } from './prop'
const condition = has('foo')
const v = function (a){
return typeof a === 'number'
}
const t = function (a){
return a + 1
}
const ifFn = x => prop('foo', x).length
const elseFn = () => false
test('happy', () => {
const fn = ifElse(condition, ifFn)(elseFn)
expect(fn({ foo : 'bar' })).toEqual(3)
expect(fn({ fo : 'bar' })).toEqual(false)
})
test('ramda spec', () => {
const ifIsNumber = ifElse(v)
expect(ifIsNumber(t, identity)(15)).toEqual(16)
expect(ifIsNumber(t, identity)('hello')).toEqual('hello')
})
test('pass all arguments', () => {
const identity = function (a){
return a
}
const v = function (){
return true
}
const onTrue = function (a, b){
expect(a).toEqual(123)
expect(b).toEqual('abc')
}
ifElse(
v, onTrue, identity
)(123, 'abc')
})
test('accept constant as condition', () => {
const fn = ifElse(true)(always(true))(always(false))
expect(fn()).toEqual(true)
})
test('accept constant as condition - case 2', () => {
const fn = ifElse(
false, always(true), always(false)
)
expect(fn()).toEqual(false)
})
test('curry 1', () => {
const fn = ifElse(condition, ifFn)(elseFn)
expect(fn({ foo : 'bar' })).toEqual(3)
expect(fn({ fo : 'bar' })).toEqual(false)
})
test('curry 2', () => {
const fn = ifElse(condition)(ifFn)(elseFn)
expect(fn({ foo : 'bar' })).toEqual(3)
expect(fn({ fo : 'bar' })).toEqual(false)
})
Reason for the failure: rambda doesn't return a curried function
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('ifElse', function() {
var t = function(a) { return a + 1; };
var identity = function(a) { return a; };
var isArray = function(a) { return Object.prototype.toString.call(a) === '[object Array]'; };
it('returns a function whose arity equals the max arity of the three arguments to `ifElse`', function() {
function a0() { return 0; }
function a1(x) { return x; }
function a2(x, y) { return x + y; }
eq(R.ifElse(a0, a1, a2).length, 2);
eq(R.ifElse(a0, a2, a1).length, 2);
eq(R.ifElse(a1, a0, a2).length, 2);
eq(R.ifElse(a1, a2, a0).length, 2);
eq(R.ifElse(a2, a0, a1).length, 2);
eq(R.ifElse(a2, a1, a0).length, 2);
});
it('returns a curried function', function() {
var v = function(a) { return typeof a === 'number'; };
var ifIsNumber = R.ifElse(v);
eq(ifIsNumber(t, identity)(15), 16);
eq(ifIsNumber(t, identity)('hello'), 'hello');
var fn = R.ifElse(R.gt, R.subtract, R.add);
eq(fn(2)(7), 9);
eq(fn(2, 7), 9);
eq(fn(7)(2), 5);
eq(fn(7, 2), 5);
});
});
inc(x: number): number
It increments a number.
R.inc(1) // => 2
Try the above R.inc example in Rambda REPL
inc(x: number): number;
export const inc = x => x + 1
import { inc } from './inc'
test('happy', () => {
expect(inc(1)).toBe(2)
})
includes(valueToFind: string, input: ReadonlyArray<string> | string): boolean
If input is string, then this method work as native String.includes.
If input is array, then R.equals is used to define if valueToFind belongs to the list.
const result = [
R.includes('oo', 'foo'),
R.includes({a: 1}, [{a: 1}])
]
// => [true, true ]
Try the above R.includes example in Rambda REPL
includes(valueToFind: string, input: ReadonlyArray<string> | string): boolean;
includes(valueToFind: string): (input: ReadonlyArray<string> | string) => boolean;
includes<T>(valueToFind: T, input: ReadonlyArray<T>): boolean;
includes<T>(valueToFind: T): (input: ReadonlyArray<T>) => boolean;
import { equals } from './equals'
export function includes(valueToFind, input){
if (arguments.length === 1) return _input => includes(valueToFind, _input)
if (typeof input === 'string'){
return input.includes(valueToFind)
}
if (!Array.isArray(input)) return false
let index = -1
while (++index < input.length){
if (equals(input[ index ], valueToFind)){
return true
}
}
return false
}
import R from 'ramda'
import { includes } from './includes'
test('includes with string', () => {
const str = 'more is less'
expect(includes('less')(str)).toBeTrue()
expect(R.includes('less')(str)).toBeTrue()
expect(includes('never', str)).toBeFalse()
expect(R.includes('never', str)).toBeFalse()
})
test('includes with array', () => {
const arr = [ 1, 2, 3 ]
expect(includes(2)(arr)).toBeTrue()
expect(R.includes(2)(arr)).toBeTrue()
expect(includes(4, arr)).toBeFalse()
expect(R.includes(4, arr)).toBeFalse()
})
test('return false if input is falsy', () => {
expect(includes(2, null)).toBeFalse()
expect(() => R.includes(2, null)).toThrowWithMessage(TypeError,
'Cannot read property \'indexOf\' of null')
expect(includes(4, undefined)).toBeFalse()
expect(() => R.includes(4, undefined)).toThrowWithMessage(TypeError,
'Cannot read property \'indexOf\' of undefined')
})
Reason for the failure: ramda method pass to
equalsmethod if available
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('includes', function() {
it('has R.equals semantics', function() {
function Just(x) { this.value = x; }
Just.prototype.equals = function(x) {
return x instanceof Just && R.equals(x.value, this.value);
};
eq(R.includes(0, [-0]), false);
eq(R.includes(-0, [0]), false);
eq(R.includes(NaN, [NaN]), true);
eq(R.includes(new Just([42]), [new Just([42])]), true);
});
});
indexBy<T>(condition: (x: T) => string, list: ReadonlyArray<T>): { [key: string]: T }
It generates object with properties provided by condition and values provided by list array.
If condition is a function, then all list members are passed through it.
If condition is a string, then all list members are passed through R.path(condition).
const list = [ {id: 10}, {id: 20} ]
const withFunction = R.indexBy(
x => x.id,
list
)
const withString = R.indexBy(
'id',
list
)
const result = [
withFunction,
R.equals(withFunction, withString)
]
// => [ { 10: {id: 10}, 20: {id: 20} }, true ]
Try the above R.indexBy example in Rambda REPL
indexBy<T>(condition: (x: T) => string, list: ReadonlyArray<T>): { [key: string]: T };
indexBy<T>(condition: string, list: ReadonlyArray<T>): { [key: string]: T };
indexBy<T>(condition: (x: T) => string): (list: ReadonlyArray<T>) => { [key: string]: T };
indexBy<T>(condition: string): (list: ReadonlyArray<T>) => { [key: string]: T };
import { path } from './path'
function indexByPath(pathInput, list){
const toReturn = {}
for (let i = 0; i < list.length; i++){
const item = list[ i ]
toReturn[ path(pathInput, item) ] = item
}
return toReturn
}
export function indexBy(condition, list){
if (arguments.length === 1){
return _list => indexBy(condition, _list)
}
if (typeof condition === 'string'){
return indexByPath(condition, list)
}
const toReturn = {}
for (let i = 0; i < list.length; i++){
const item = list[ i ]
toReturn[ condition(item) ] = item
}
return toReturn
}
import { indexBy } from './indexBy'
import { prop } from './prop'
test('happy', () => {
const list = [
{ id : 1 },
{
id : 1,
a : 2,
},
{ id : 2 },
{ id : 10 },
{ id : 'a' },
]
expect(indexBy(prop('id'))(list)).toEqual({
1 : {
id : 1,
a : 2,
},
2 : { id : 2 },
10 : { id : 10 },
a : { id : 'a' },
})
})
test('with string as condition', () => {
const list = [ { id : 1 }, { id : 2 }, { id : 10 }, { id : 'a' } ]
const standardResult = indexBy(obj => obj.id, list)
const suggestionResult = indexBy('id', list)
expect(standardResult).toEqual(suggestionResult)
})
test('with string - bad path', () => {
const list = [
{
a : {
b : 1,
c : 2,
},
},
{ a : { c : 4 } },
{},
{
a : {
b : 10,
c : 20,
},
},
]
const result = indexBy('a.b', list)
const expected = {
1 : {
a : {
b : 1,
c : 2,
},
},
10 : {
a : {
b : 10,
c : 20,
},
},
undefined : {},
}
expect(result).toEqual(expected)
})
import {indexBy} from 'rambda'
const list = [{a: {b: '1'}}, {a: {c: '2'}}, {a: {b: '3'}}]
describe('indexBy', () => {
it('happy', () => {
const result = indexBy<any>(x => x.a.b, list)
const resultCurried = indexBy<any>(x => x.a.b)(list)
result // $ExpectType { [key: string]: any; }
resultCurried // $ExpectType { [key: string]: any; }
})
it('with string', () => {
const result = indexBy<any>('a.b', list)
const resultCurried = indexBy<any>('a.b')(list)
result // $ExpectType { [key: string]: any; }
resultCurried // $ExpectType { [key: string]: any; }
})
it('with interface', () => {
interface Foo {
a: string,
}
const interfaceList = [{a: 'foo'}, {a: 'bar'}]
const result = indexBy<Foo>(x => {
x.a // $ExpectType string
return x.a
}, interfaceList)
const resultCurried = indexBy<Foo>(x => {
x.a // $ExpectType string
return x.a
})(interfaceList)
result // $ExpectType { [key: string]: Foo; }
resultCurried // $ExpectType { [key: string]: Foo; }
})
})
Reason for the failure: ramda method can act as a transducer
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('indexBy', function() {
it('can act as a transducer', function() {
var list = [{id: 'xyz', title: 'A'}, {id: 'abc', title: 'B'}];
var transducer = R.compose(
R.indexBy(R.prop('id')),
R.map(R.pipe(
R.adjust(0, R.toUpper),
R.adjust(1, R.omit(['id']))
)));
var result = R.into({}, transducer, list);
eq(result, {ABC: {title: 'B'}, XYZ: {title: 'A'}});
});
});
indexOf<T>(valueToFind: T, list: ReadonlyArray<T>): number
It returns the index of the first element of list equals to valueToFind.
If there is no such element, it returns -1.
const list = [0, 1, 2, 3]
const result = [
R.indexOf(2, list),
R.indexOf(0, list)
]
// => [2, -1]
Try the above R.indexOf example in Rambda REPL
indexOf<T>(valueToFind: T, list: ReadonlyArray<T>): number;
indexOf<T>(valueToFind: T): (list: ReadonlyArray<T>) => number;
export function indexOf(valueToFind, list){
if (arguments.length === 1){
return _list => indexOf(valueToFind, _list)
}
let index = -1
const { length } = list
while (++index < length){
if (list[ index ] === valueToFind){
return index
}
}
return -1
}
import { indexOf } from './indexOf'
test('indexOf', () => {
expect(indexOf(3, [ 1, 2, 3, 4 ])).toEqual(2)
expect(indexOf(10)([ 1, 2, 3, 4 ])).toEqual(-1)
})
Reason for the failure: ramda method dispatches to
indexOfmethod
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('indexOf', function() {
var input = [1, 2, 3, 4, 5];
var list = [1, 2, 3];
list[-2] = 4; // Throw a wrench in the gears by assigning a non-valid array index as object property.
it('has R.equals semantics', function() {
function Just(x) { this.value = x; }
Just.prototype.equals = function(x) {
return x instanceof Just && R.equals(x.value, this.value);
};
eq(R.indexOf(0, [-0]), -1);
eq(R.indexOf(-0, [0]), -1);
eq(R.indexOf(NaN, [NaN]), 0);
eq(R.indexOf(new Just([42]), [new Just([42])]), 0);
});
it('dispatches to `indexOf` method', function() {
function Empty() {}
Empty.prototype.indexOf = R.always(-1);
function List(head, tail) {
this.head = head;
this.tail = tail;
}
List.prototype.indexOf = function(x) {
var idx = this.tail.indexOf(x);
return this.head === x ? 0 : idx >= 0 ? 1 + idx : -1;
};
var list = new List('b',
new List('a',
new List('n',
new List('a',
new List('n',
new List('a',
new Empty()
)
)
)
)
)
);
eq(R.indexOf('a', 'banana'), 1);
eq(R.indexOf('x', 'banana'), -1);
eq(R.indexOf('a', list), 1);
eq(R.indexOf('x', list), -1);
});
});
init<T>(listOrString: ReadonlyArray<T>): T[]
It returns all but the last element of listOrString.
const result = [
R.init([1, 2, 3]) ,
R.init('foo') // => 'fo'
]
// => [[1, 2], 'fo']
Try the above R.init example in Rambda REPL
init<T>(listOrString: ReadonlyArray<T>): T[];
init(listOrString: string): string;
import baseSlice from './_internals/baseSlice'
export function init(listOrString){
if (typeof listOrString === 'string') return listOrString.slice(0, -1)
return listOrString.length ? baseSlice(
listOrString, 0, -1
) : []
}
import { init } from './init'
test('with array', () => {
expect(init([ 1, 2, 3 ])).toEqual([ 1, 2 ])
expect(init([ 1, 2 ])).toEqual([ 1 ])
expect(init([ 1 ])).toEqual([])
expect(init([])).toEqual([])
expect(init([])).toEqual([])
expect(init([ 1 ])).toEqual([])
})
test('with string', () => {
expect(init('foo')).toEqual('fo')
expect(init('f')).toEqual('')
expect(init('')).toEqual('')
})
intersection<T>(listA: ReadonlyArray<T>, listB: ReadonlyArray<T>): T[]
It loops throw listA and listB and returns the intersection of the two according to R.equals.
const listA = [ { id : 1 }, { id : 2 }, { id : 3 }, { id : 4 } ]
const listB = [ { id : 3 }, { id : 4 }, { id : 5 }, { id : 6 } ]
const result = intersection(listA, listB)
// => [{ id : 3 }, { id : 4 }]
Try the above R.intersection example in Rambda REPL
intersection<T>(listA: ReadonlyArray<T>, listB: ReadonlyArray<T>): T[];
intersection<T>(listA: ReadonlyArray<T>): (listB: ReadonlyArray<T>) => T[];
import { filter } from './filter'
import { includes } from './includes'
export function intersection(listA, listB){
if (arguments.length === 1) return _list => intersection(listA, _list)
return filter(value => includes(value, listB), listA)
}
import { intersection } from './intersection'
test('intersection', () => {
const list1 = [ 1, 2, 3, 4 ]
const list2 = [ 3, 4, 5, 6 ]
expect(intersection(list1)(list2)).toEqual([ 3, 4 ])
expect(intersection([], [])).toEqual([])
})
test('intersection with objects', () => {
const list1 = [ { id : 1 }, { id : 2 }, { id : 3 }, { id : 4 } ]
const list2 = [ { id : 3 }, { id : 4 }, { id : 5 }, { id : 6 } ]
expect(intersection(list1)(list2)).toEqual([ { id : 3 }, { id : 4 } ])
})
intersperse<T>(separator: T, list: ReadonlyArray<T>): T[]
It adds a separator between members of list.
const list = [ 0, 1, 2, 3 ]
const separator = '|'
const result = intersperse(separator, list)
// => [0, '|', 1, '|', 2, '|', 3]
Try the above R.intersperse example in Rambda REPL
intersperse<T>(separator: T, list: ReadonlyArray<T>): T[];
intersperse<T>(separator: T): (list: ReadonlyArray<T>) => T[];
export function intersperse(separator, list){
if (arguments.length === 1) return _list => intersperse(separator, _list)
let index = -1
const len = list.length
const willReturn = []
while (++index < len){
if (index === len - 1){
willReturn.push(list[ index ])
} else {
willReturn.push(list[ index ], separator)
}
}
return willReturn
}
import { intersperse } from './intersperse'
test('intersperse', () => {
const list = [ { id : 1 }, { id : 2 }, { id : 10 }, { id : 'a' } ]
expect(intersperse('!', list)).toEqual([
{ id : 1 },
'!',
{ id : 2 },
'!',
{ id : 10 },
'!',
{ id : 'a' },
])
expect(intersperse('!')([])).toEqual([])
})
is(targetPrototype: any, x: any): boolean
It returns true is x is instance of targetPrototype.
const result = [
R.is(String, 'foo'),
R.is(Array, 1)
]
// => [true, false]
Try the above R.is example in Rambda REPL
is(targetPrototype: any, x: any): boolean;
is(targetPrototype: any): (x: any) => boolean;
export function is(targetPrototype, x){
if (arguments.length === 1) return _x => is(targetPrototype, _x)
return (
x != null && x.constructor === targetPrototype ||
x instanceof targetPrototype
)
}
import { is } from './is'
test('works with built-in types', () => {
expect(is(Array, undefined)).toBeFalse()
expect(is(Array)([])).toBeTrue()
expect(is(Boolean, new Boolean(false))).toBeTrue()
expect(is(Date, new Date())).toBeTrue()
expect(is(Function, () => {})).toBeTrue()
expect(is(Number, new Number(0))).toBeTrue()
expect(is(Object, {})).toBeTrue()
expect(is(RegExp, /(?:)/)).toBeTrue()
expect(is(String, new String(''))).toBeTrue()
})
test('works with user-defined types', () => {
function Foo(){}
function Bar(){}
Bar.prototype = new Foo()
const foo = new Foo()
const bar = new Bar()
expect(is(Foo, foo)).toBeTrue()
expect(is(Bar, bar)).toBeTrue()
expect(is(Foo, bar)).toBeTrue()
expect(is(Bar, foo)).toBeFalse()
})
test('does not coerce', () => {
expect(is(Boolean, 1)).toBeFalse()
expect(is(Number, '1')).toBeFalse()
expect(is(Number, false)).toBeFalse()
})
test('recognizes primitives as their object equivalents', () => {
expect(is(Boolean, false)).toBeTrue()
expect(is(Number, 0)).toBeTrue()
expect(is(String, '')).toBeTrue()
})
test('does not consider primitives to be instances of Object', () => {
expect(is(Object, false)).toBeFalse()
expect(is(Object, 0)).toBeFalse()
expect(is(Object, '')).toBeFalse()
})
isEmpty<T>(x: T): boolean
It returns true is x is empty.
const result = [
R.isEmpty(''),
R.isEmpty({ x : 0 })
]
// => [true, false]
Try the above R.isEmpty example in Rambda REPL
isEmpty<T>(x: T): boolean;
import { type } from './type.js'
export function isEmpty(input){
const inputType = type(input)
if ([ 'Undefined', 'NaN', 'Number', 'Null' ].includes(inputType))
return false
if (!input) return true
if (inputType === 'Object'){
return Object.keys(input).length === 0
}
if (inputType === 'Array'){
return input.length === 0
}
return false
}
import { isEmpty } from './isEmpty'
test('happy', () => {
expect(isEmpty(undefined)).toEqual(false)
expect(isEmpty('')).toEqual(true)
expect(isEmpty(null)).toEqual(false)
expect(isEmpty(' ')).toEqual(false)
expect(isEmpty(new RegExp(''))).toEqual(false)
expect(isEmpty([])).toEqual(true)
expect(isEmpty([ [] ])).toEqual(false)
expect(isEmpty({})).toEqual(true)
expect(isEmpty({ x : 0 })).toEqual(false)
expect(isEmpty(0)).toEqual(false)
expect(isEmpty(NaN)).toEqual(false)
expect(isEmpty([ '' ])).toEqual(false)
})
Reason for the failure: ramda supports typed arrays
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('isEmpty', function() {
it('returns true for empty typed array', function() {
eq(R.isEmpty(Uint8Array.from('')), true);
eq(R.isEmpty(Float32Array.from('')), true);
eq(R.isEmpty(new Float32Array([])), true);
eq(R.isEmpty(Uint8Array.from('1')), false);
eq(R.isEmpty(Float32Array.from('1')), false);
eq(R.isEmpty(new Float32Array([1])), false);
});
});
isNil(x: any): x is null | undefined
It returns true is x is either null or undefined.
const result = [
R.isNil(null),
R.isNil(1),
]
// => [true, false]
Try the above R.isNil example in Rambda REPL
isNil(x: any): x is null | undefined;
export function isNil(x){
return x === undefined || x === null
}
import { isNil } from './isNil'
test('happy', () => {
expect(isNil(null)).toBeTrue()
expect(isNil(undefined)).toBeTrue()
expect(isNil([])).toBeFalse()
})
join(x: string, xs: ReadonlyArray<any>): string
It returns a string representing list instances joined with glue.
R.join('-', [1, 2, 3]) // => '1-2-3'
Try the above R.join example in Rambda REPL
join(x: string, xs: ReadonlyArray<any>): string;
join(x: string): (xs: ReadonlyArray<any>) => string;
export function join(glue, list){
if (arguments.length === 1) return _list => join(glue, _list)
return list.join(glue)
}
import { join } from './join'
test('curry', () => {
expect(join('|')([ 'foo', 'bar', 'baz' ])).toEqual('foo|bar|baz')
expect(join('|', [ 1, 2, 3 ])).toEqual('1|2|3')
const spacer = join(' ')
expect(spacer([ 'a', 2, 3.4 ])).toEqual('a 2 3.4')
})
keys<T extends object>(x: T): (keyof T)[]
It applies Object.keys over x and returns its keys.
R.keys({a:1, b:2}) // => ['a', 'b']
Try the above R.keys example in Rambda REPL
keys<T extends object>(x: T): (keyof T)[];
keys<T>(x: T): string[];
export function keys(x){
return Object.keys(x)
}
import { keys } from './keys.js'
test('happy', () => {
expect(keys({ a : 1 })).toEqual([ 'a' ])
})
Reason for the failure: ramda method works for primitives
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('keys', function() {
var obj = {a: 100, b: [1, 2, 3], c: {x: 200, y: 300}, d: 'D', e: null, f: undefined};
function C() { this.a = 100; this.b = 200; }
C.prototype.x = function() { return 'x'; };
C.prototype.y = 'y';
var cobj = new C();
it('works for primitives', function() {
eq(R.keys(null), []);
eq(R.keys(undefined), []);
eq(R.keys(55), []);
eq(R.keys('foo'), []);
eq(R.keys(true), []);
eq(R.keys(false), []);
eq(R.keys(NaN), []);
eq(R.keys(Infinity), []);
eq(R.keys([]), []);
});
});
last<T>(listOrString: T[]): T | undefined
It returns the last element of listOrString.
const result = [
R.last([1, 2, 3]),
R.last('foo'),
]
// => [3, 'o']
Try the above R.last example in Rambda REPL
last<T>(listOrString: T[]): T | undefined;
last(listOrString: string): string;
export function last(listOrString){
if (typeof listOrString === 'string'){
return listOrString[ listOrString.length - 1 ] || ''
}
return listOrString[ listOrString.length - 1 ]
}
import { last } from './last'
test('happy', () => {
expect(last([ 'foo', 'bar', 'baz' ])).toEqual('baz')
expect(last([])).toEqual(undefined)
expect(last('abc')).toEqual('c')
expect(last('')).toEqual('')
})
lastIndexOf<T>(target: T, list: ReadonlyArray<T>): number
It returns the last index of target in list array.
R.equals is used to determine equality between target and members of list.
If there is no such index, then -1 is returned.
const list = [1, 2, 3, 1, 2, 3]
const result = [
R.lastIndexOf(2, list),
R.lastIndexOf(4, list),
]
// => [4, -1]
Try the above R.lastIndexOf example in Rambda REPL
lastIndexOf<T>(target: T, list: ReadonlyArray<T>): number;
lastIndexOf<T>(target: T): (list: ReadonlyArray<T>) => number;
import { equals } from './equals'
export function lastIndexOf(target, list){
if (arguments.length === 1) return _list => lastIndexOf(target, _list)
let index = list.length
while (--index > 0){
if (equals(list[ index ], target)){
return index
}
}
return -1
}
import { lastIndexOf } from './lastIndexOf'
test('happy', () => {
const a = lastIndexOf(1, [ 1, 2, 3, 1, 2 ])
const b = lastIndexOf(1)([ 1, 2, 3, 1, 2 ])
expect(a).toEqual(3)
expect(b).toEqual(3)
})
test('false', () => {
const a = lastIndexOf(10, [ 1, 2, 3, 1, 2 ])
expect(a).toEqual(-1)
})
Reason for the failure: ramda method dispatches to
lastIndexOfmethod
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('lastIndexOf', function() {
var input = [1, 2, 3, 4, 5, 1];
var list = ['a', 1, 'a'];
list[-2] = 'a'; // Throw a wrench in the gears by assigning a non-valid array index as object property.
it('has R.equals semantics', function() {
function Just(x) { this.value = x; }
Just.prototype.equals = function(x) {
return x instanceof Just && R.equals(x.value, this.value);
};
eq(R.lastIndexOf(0, [-0]), -1);
eq(R.lastIndexOf(-0, [0]), -1);
eq(R.lastIndexOf(NaN, [NaN]), 0);
eq(R.lastIndexOf(new Just([42]), [new Just([42])]), 0);
});
it('dispatches to `lastIndexOf` method', function() {
function Empty() {}
Empty.prototype.lastIndexOf = R.always(-1);
function List(head, tail) {
this.head = head;
this.tail = tail;
}
List.prototype.lastIndexOf = function(x) {
var idx = this.tail.lastIndexOf(x);
return idx >= 0 ? 1 + idx : this.head === x ? 0 : -1;
};
var list = new List('b',
new List('a',
new List('n',
new List('a',
new List('n',
new List('a',
new Empty()
)
)
)
)
)
);
eq(R.lastIndexOf('a', 'banana'), 5);
eq(R.lastIndexOf('x', 'banana'), -1);
eq(R.lastIndexOf('a', list), 5);
eq(R.lastIndexOf('x', list), -1);
});
it('finds function, compared by identity', function() {
var f = function() {};
var g = function() {};
var list = [g, f, g, f];
eq(R.lastIndexOf(f, list), 3);
});
});
length<T>(listOrString: ReadonlyArray<T>): number
It returns the length property of listOrString.
const result = [
R.length([1, 2, 3, 4]),
R.length('foo'),
]
// => [4, 3]
Try the above R.length example in Rambda REPL
length<T>(listOrString: ReadonlyArray<T>): number;
export function length(x){
if (!x || x.length === undefined){
return NaN
}
return x.length
}
import { length } from './length'
test('happy', () => {
expect(length('foo')).toEqual(3)
expect(length([ 1, 2, 3 ])).toEqual(3)
expect(length([])).toEqual(0)
})
test('with bad input returns NaN', () => {
expect(length(0)).toBeNaN()
expect(length({})).toBeNaN()
expect(length(null)).toBeNaN()
expect(length(undefined)).toBeNaN()
})
Reason for the failure: ramda method supports object with
lengthmethod
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('length', function() {
it('returns the length of a string', function() {
eq(R.length(''), 0);
eq(R.length('xyz'), 3);
});
it('returns NaN for length property of unexpected type', function() {
eq(R.identical(NaN, R.length({length: ''})), true);
eq(R.identical(NaN, R.length({length: '1.23'})), true);
eq(R.identical(NaN, R.length({length: null})), true);
eq(R.identical(NaN, R.length({length: undefined})), true);
eq(R.identical(NaN, R.length({})), true);
});
});
lens<T, U, V>(getter: (s: T) => U, setter: (a: U, s: T) => V): Lens
It returns a lens for the given getter and setter functions.
The getter gets the value of the focus; the setter sets the value of the focus.
The setter should not mutate the data structure.
const xLens = R.lens(R.prop('x'), R.assoc('x'));
R.view(xLens, {x: 1, y: 2}) // => 1
R.set(xLens, 4, {x: 1, y: 2}) // => {x: 4, y: 2}
R.over(xLens, R.negate, {x: 1, y: 2}) // => {x: -1, y: 2}
Try the above R.lens example in Rambda REPL
lens<T, U, V>(getter: (s: T) => U, setter: (a: U, s: T) => V): Lens;
lens<T, U, V>(getter: (s: T) => U, setter: (a: U, s: T) => V): Lens;
export function lens(getter, setter){
if (arguments.length === 1) return _setter => lens(getter, _setter)
return function (functor){
return function (target){
return functor(getter(target)).map(focus => setter(focus, target))
}
}
}
lensIndex(index: number): Lens
It returns a lens that focuses on specified index.
const list = ['a', 'b', 'c']
const headLens = R.lensIndex(0)
R.view(headLens, list) // => 'a'
R.set(headLens, 'x', list) // => ['x', 'b', 'c']
R.over(headLens, R.toUpper, list) // => ['A', 'b', 'c']
Try the above R.lensIndex example in Rambda REPL
lensIndex(index: number): Lens;
import { lens } from './lens'
import { nth } from './nth'
import { update } from './update'
export function lensIndex(index){
return lens(nth(index), update(index))
}
import { compose } from './compose'
import { keys } from './keys'
import { lensIndex } from './lensIndex'
import { over } from './over'
import { set } from './set'
import { view } from './view'
const testList = [ { a : 1 }, { b : 2 }, { c : 3 } ]
test('focuses list element at the specified index', () => {
expect(view(lensIndex(0), testList)).toEqual({ a : 1 })
})
test('returns undefined if the specified index does not exist', () => {
expect(view(lensIndex(10), testList)).toEqual(undefined)
})
test('sets the list value at the specified index', () => {
expect(set(
lensIndex(0), 0, testList
)).toEqual([ 0, { b : 2 }, { c : 3 } ])
})
test('applies function to the value at the specified list index', () => {
expect(over(
lensIndex(2), keys, testList
)).toEqual([ { a : 1 }, { b : 2 }, [ 'c' ] ])
})
test('can be composed', () => {
const nestedList = [ 0, [ 10, 11, 12 ], 1, 2 ]
const composedLens = compose(lensIndex(1), lensIndex(0))
expect(view(composedLens, nestedList)).toEqual(10)
})
test('set s (get s) === s', () => {
expect(set(
lensIndex(0), view(lensIndex(0), testList), testList
)).toEqual(testList)
})
test('get (set s v) === v', () => {
expect(view(lensIndex(0), set(
lensIndex(0), 0, testList
))).toEqual(0)
})
test('get (set(set s v1) v2) === v2', () => {
expect(view(lensIndex(0),
set(
lensIndex(0), 11, set(
lensIndex(0), 10, testList
)
))).toEqual(11)
})
lensPath(path: RamdaPath): Lens
It returns a lens that focuses on specified path.
const lensPath = R.lensPath(['x', 0, 'y'])
const input = {x: [{y: 2, z: 3}, {y: 4, z: 5}]}
R.view(lensPath, input) //=> 2
R.set(lensPath, 1, input)
//=> {x: [{y: 1, z: 3}, {y: 4, z: 5}]}
R.over(xHeadYLens, R.negate, input)
//=> {x: [{y: -2, z: 3}, {y: 4, z: 5}]}
Try the above R.lensPath example in Rambda REPL
lensPath(path: RamdaPath): Lens;
import { assocPath } from './assocPath'
import { lens } from './lens'
import { path } from './path'
export function lensPath(key){
return lens(path(key), assocPath(key))
}
import { compose } from './compose'
import { identity } from './identity'
import { inc } from './inc'
import { lensPath } from './lensPath'
import { lensProp } from './lensProp'
import { over } from './over'
import { set } from './set'
import { view } from './view'
const testObj = {
a : [ { b : 1 }, { b : 2 } ],
d : 3,
}
test('view', () => {
expect(view(lensPath('d'), testObj)).toEqual(3)
expect(view(lensPath('a.0.b'), testObj)).toEqual(1)
// this is different to ramda, ramda will return a clone of the input object
expect(view(lensPath(''), testObj)).toEqual(undefined)
})
test('set', () => {
expect(set(
lensProp('d'), 0, testObj
)).toEqual({
a : [ { b : 1 }, { b : 2 } ],
d : 0,
})
expect(set(
lensPath('a.0.b'), 0, testObj
)).toEqual({
a : [ { b : 0 }, { b : 2 } ],
d : 3,
})
expect(set(
lensPath('a.0.X'), 0, testObj
)).toEqual({
a : [
{
b : 1,
X : 0,
},
{ b : 2 },
],
d : 3,
})
expect(set(
lensPath([]), 0, testObj
)).toEqual(0)
})
test('over', () => {
expect(over(
lensPath('d'), inc, testObj
)).toEqual({
a : [ { b : 1 }, { b : 2 } ],
d : 4,
})
expect(over(
lensPath('a.1.b'), inc, testObj
)).toEqual({
a : [ { b : 1 }, { b : 3 } ],
d : 3,
})
expect(over(
lensProp('X'), identity, testObj
)).toEqual({
a : [ { b : 1 }, { b : 2 } ],
d : 3,
X : undefined,
})
expect(over(
lensPath('a.0.X'), identity, testObj
)).toEqual({
a : [
{
b : 1,
X : undefined,
},
{ b : 2 },
],
d : 3,
})
})
test('compose', () => {
const composedLens = compose(lensPath('a'), lensPath('1.b'))
expect(view(composedLens, testObj)).toEqual(2)
})
test('set s (get s) === s', () => {
expect(set(
lensPath([ 'd' ]), view(lensPath([ 'd' ]), testObj), testObj
)).toEqual(testObj)
expect(set(
lensPath([ 'a', 0, 'b' ]),
view(lensPath([ 'a', 0, 'b' ]), testObj),
testObj
)).toEqual(testObj)
})
test('get (set s v) === v', () => {
expect(view(lensPath([ 'd' ]), set(
lensPath([ 'd' ]), 0, testObj
))).toEqual(0)
expect(view(lensPath([ 'a', 0, 'b' ]), set(
lensPath([ 'a', 0, 'b' ]), 0, testObj
))).toEqual(0)
})
test('get (set(set s v1) v2) === v2', () => {
const p = [ 'd' ]
const q = [ 'a', 0, 'b' ]
expect(view(lensPath(p), set(
lensPath(p), 11, set(
lensPath(p), 10, testObj
)
))).toEqual(11)
expect(view(lensPath(q), set(
lensPath(q), 11, set(
lensPath(q), 10, testObj
)
))).toEqual(11)
})
lensProp(prop: string): {
<T, U>(obj: T): U
It returns a lens that focuses on specified property prop.
const xLens = R.lensProp('x');
const input = {x: 1, y: 2}
R.view(xLens, input) // => 1
R.set(xLens, 4, input)
// => {x: 4, y: 2}
R.over(xLens, R.negate, input)
// => {x: -1, y: 2}
Try the above R.lensProp example in Rambda REPL
lensProp(prop: string): {
<T, U>(obj: T): U;
set<T, U, V>(val: T, obj: U): V;
};
import { assoc } from './assoc'
import { lens } from './lens'
import { prop } from './prop'
export function lensProp(key){
return lens(prop(key), assoc(key))
}
import { compose } from './compose'
import { identity } from './identity'
import { inc } from './inc'
import { lensProp } from './lensProp'
import { over } from './over'
import { set } from './set'
import { view } from './view'
const testObj = {
a : 1,
b : 2,
c : 3,
}
test('focuses object the specified object property', () => {
expect(view(lensProp('a'), testObj)).toEqual(1)
})
test('returns undefined if the specified property does not exist', () => {
expect(view(lensProp('X'), testObj)).toEqual(undefined)
})
test('sets the value of the object property specified', () => {
expect(set(
lensProp('a'), 0, testObj
)).toEqual({
a : 0,
b : 2,
c : 3,
})
})
test('adds the property to the object if it doesn\'t exist', () => {
expect(set(
lensProp('d'), 4, testObj
)).toEqual({
a : 1,
b : 2,
c : 3,
d : 4,
})
})
test('applies function to the value of the specified object property', () => {
expect(over(
lensProp('a'), inc, testObj
)).toEqual({
a : 2,
b : 2,
c : 3,
})
})
test('applies function to undefined and adds the property if it doesn\'t exist', () => {
expect(over(
lensProp('X'), identity, testObj
)).toEqual({
a : 1,
b : 2,
c : 3,
X : undefined,
})
})
test('can be composed', () => {
const nestedObj = {
a : { b : 1 },
c : 2,
}
const composedLens = compose(lensProp('a'), lensProp('b'))
expect(view(composedLens, nestedObj)).toEqual(1)
})
test('set s (get s) === s', () => {
expect(set(
lensProp('a'), view(lensProp('a'), testObj), testObj
)).toEqual(testObj)
})
test('get (set s v) === v', () => {
expect(view(lensProp('a'), set(
lensProp('a'), 0, testObj
))).toEqual(0)
})
test('get (set(set s v1) v2) === v2', () => {
expect(view(lensProp('a'),
set(
lensProp('a'), 11, set(
lensProp('a'), 10, testObj
)
))).toEqual(11)
})
map<T, U>(fn: MapFunctionObject<T, U>, list: Dictionary<T>): Dictionary<U>
It returns the result of looping through list with fn.
It works with both array and object.
const fn = (x, i) => (x * 2) + i
const fnWhenObject = (val, prop)=>{
return `${prop}-${val}`
}
const list = [1, 2]
const obj = {a: 1, b: 2}
const result = [
R.map(fn, list),
R.map(fnWhenObject, obj)
]
// => [ [2, 5], {a: 'a-1', b: 'b-2'}]
Try the above R.map example in Rambda REPL
map<T, U>(fn: MapFunctionObject<T, U>, list: Dictionary<T>): Dictionary<U>;
map<T, U>(fn: MapFunctionArray<T, U>, list: T[]): U[];
map<T, U>(fn: MapFunctionArray<T, U>): (list: T[]) => U[];
map<T, U, S>(fn: MapFunctionObject<T, U>): (list: Dictionary<T>) => Dictionary<U>;
map<T>(fn: MapFunctionArray<T, T>): (list: T[]) => T[];
map<T>(fn: MapFunctionArray<T, T>, list: ReadonlyArray<T>): T[];
function mapObject(fn, obj){
const willReturn = {}
for (const prop in obj){
willReturn[ prop ] = fn(
obj[ prop ], prop, obj
)
}
return willReturn
}
export function map(fn, list){
if (arguments.length === 1) return _list => map(fn, _list)
if (list === undefined){
return []
}
if (!Array.isArray(list)){
return mapObject(fn, list)
}
let index = -1
const len = list.length
const willReturn = Array(len)
while (++index < len){
willReturn[ index ] = fn(list[ index ], index)
}
return willReturn
}
import { map } from './map'
const double = x => x * 2
const sampleObject = {
a : 1,
b : 2,
c : 3,
d : 4,
}
test('with array', () => {
expect(map(double, [ 1, 2, 3 ])).toEqual([ 2, 4, 6 ])
})
test('pass index as second argument', () => {
map((x, i) => {
expect(i).toBeNumber()
},
[ 10, 20, 30 ])
})
test('with object', () => {
const obj = {
a : 1,
b : 2,
}
expect(map(double, obj)).toEqual({
a : 2,
b : 4,
})
})
test('pass input object as third argument', () => {
const obj = {
a : 1,
b : 2,
}
const iterator = (
val, prop, inputObject
) => {
expect(inputObject).toEqual(obj)
return val * 2
}
expect(map(iterator, obj)).toEqual({
a : 2,
b : 4,
})
})
test('with object passes property as second argument', () => {
map((_, prop) => {
expect(typeof prop).toEqual('string')
})(sampleObject)
})
/**
* https://github.com/selfrefactor/rambda/issues/77
*/
test('when undefined instead of array', () => {
expect(map(double, undefined)).toEqual([])
})
import {map} from 'rambda'
describe('map with arrays', () => {
it('only one type', () => {
const x = map<number>(
(a, b) => {
a // $ExpectType number
b // $ExpectType number
return a + 2
},
[1, 2, 3]
)
x // $ExpectType number[]
})
it('only one type + curry', () => {
const x = map<number>((a, b) => {
a // $ExpectType number
b // $ExpectType number
return a + 2
})([1, 2, 3])
x // $ExpectType number[]
})
it('2 types', () => {
const x = map<number, string>(
(a, b) => {
a // $ExpectType number
b // $ExpectType number
return `${a}`
},
[1, 2, 3]
)
x // $ExpectType string[]
})
it('2 types + curry', () => {
const x = map<number, string>((a, b) => {
a // $ExpectType number
b // $ExpectType number
return `${a}`
})([1, 2, 3])
x // $ExpectType string[]
})
})
describe('map with objects', () => {
it('curry', () => {
// It requires dummy third typing argument
// in order to distinguish compared to curry typings for arrays
// ============================================
const x = map<number, string, any>((a, b, c) => {
a // $ExpectType number
b // $ExpectType string
c // $ExpectType Dictionary<number>
return `${a}`
})({a: 1, b: 2})
x // $ExpectType Dictionary<string>
})
it('1', () => {
const x = map<number, string>(
(a, b, c) => {
a // $ExpectType number
b // $ExpectType string
c // $ExpectType Dictionary<number>
return `${a}`
},
{a: 1, b: 2}
)
x // $ExpectType Dictionary<string>
})
it('2', () => {
const x = map<number, string>(
(a, b) => {
a // $ExpectType number
b // $ExpectType string
return `${a}`
},
{a: 1, b: 2}
)
x // $ExpectType Dictionary<string>
})
it('3', () => {
const x = map<number, string>(
a => {
a // $ExpectType number
return `${a}`
},
{a: 1, b: 2}
)
x // $ExpectType Dictionary<string>
})
})
match(regExpression: RegExp, str: string): any[]
Curried version of String.prototype.match which returns empty array, when there is no match.
const result = [
R.match('a', 'foo'),
R.match(/([a-z]a)/g, 'bananas')
]
// => [[], ['ba', 'na', 'na']]
Try the above R.match example in Rambda REPL
match(regExpression: RegExp, str: string): any[];
match(regExpression: RegExp): (str: string) => any[];
export function match(pattern, input){
if (arguments.length === 1) return _input => match(pattern, _input)
const willReturn = input.match(pattern)
return willReturn === null ? [] : willReturn
}
import { equals } from './equals'
import { match } from './match'
test('happy', () => {
expect(match(/a./g)('foo bar baz')).toEqual([ 'ar', 'az' ])
})
test('fallback', () => {
expect(match(/a./g)('foo')).toEqual([])
})
test('with string', () => {
expect(match('a', 'foo')).toEqual([])
expect(equals(match('o', 'foo'), [ 'o' ])).toBeTrue()
})
test('throwing', () => {
expect(() => {
match(/a./g, null)
}).toThrowWithMessage(TypeError, 'Cannot read property \'match\' of null')
})
max<T extends Ord>(x: T, y: T): T
It returns the greater value between x and y.
const result = [
R.max(5, 7),
R.max('bar', 'foo'),
]
// => [7, 'foo']
Try the above R.max example in Rambda REPL
max<T extends Ord>(x: T, y: T): T;
max<T extends Ord>(x: T): (y: T) => T;
export function max(x, y){
if (arguments.length === 1) return _y => max(x, _y)
return y > x ? y : x
}
import { max } from './max'
test('with number', () => {
expect(max(2, 1)).toBe(2)
})
test('with string', () => {
expect(max('foo')('bar')).toBe('foo')
expect(max('bar')('baz')).toBe('baz')
})
maxBy<T>(compareFn: (input: T) => Ord, x: T, y: T): T
It returns the greater value between x and y according to compareFn function.
const compareFn = Math.abs
R.maxBy(compareFn, 5, -7) // => -7
Try the above R.maxBy example in Rambda REPL
maxBy<T>(compareFn: (input: T) => Ord, x: T, y: T): T;
maxBy<T>(compareFn: (input: T) => Ord, x: T): (y: T) => T;
maxBy<T>(compareFn: (input: T) => Ord): FToolbelt.Curry<(x: T, y: T) => T>;
import { curry } from './curry'
export function maxByFn(
compareFn, x, y
){
return compareFn(y) > compareFn(x) ? y : x
}
export const maxBy = curry(maxByFn)
import { maxBy } from './maxBy'
test('happy', () => {
expect(maxBy(
Math.abs, -5, 2
)).toEqual(-5)
})
test('curried', () => {
expect(maxBy(Math.abs)(2, -5)).toEqual(-5)
expect(maxBy(Math.abs)(2)(-5)).toEqual(-5)
})
mean(list: ReadonlyArray<number>): number
It returns the mean value of list input.
R.mean([ 2, 7 ])
// => 4.5
Try the above R.mean example in Rambda REPL
mean(list: ReadonlyArray<number>): number;
import { sum } from './sum'
export function mean(list){
return sum(list) / list.length
}
import { mean } from './mean'
test('happy', () => {
expect(mean([ 2, 7 ])).toBe(4.5)
})
test('with NaN', () => {
expect(mean([])).toBeNaN()
})
median(list: ReadonlyArray<number>): number
It returns the median value of list input.
R.median([ 7, 2, 10, 9 ]) // => 8
Try the above R.median example in Rambda REPL
median(list: ReadonlyArray<number>): number;
import { mean } from './mean'
export function median(list){
const len = list.length
if (len === 0) return NaN
const width = 2 - len % 2
const idx = (len - width) / 2
return mean(Array.prototype.slice
.call(list, 0)
.sort((a, b) => {
if (a === b) return 0
return a < b ? -1 : 1
})
.slice(idx, idx + width))
}
import { identical } from './identical'
import { median } from './median'
test('median', () => {
expect(median([ 2 ])).toEqual(2)
expect(median([ 7, 2, 10, 9 ])).toEqual(8)
expect(identical(NaN, median([]))).toBeTrue()
})
merge<T1, T2>(target: T1, newProps: T2): Merge<T2, T1>
It creates a copy of target object with overidden newProps properties.
const target = { 'foo': 0, 'bar': 1 }
const newProps = { 'foo': 7 }
const result = R.merge(target, newProps)
// => { 'foo': 7, 'bar': 1 }
Try the above R.merge example in Rambda REPL
merge<T1, T2>(target: T1, newProps: T2): Merge<T2, T1>;
merge<T1>(target: T1): <T2>(newProps: T2) => Merge<T2, T1>;
export function merge(target, newProps){
if (arguments.length === 1) return _newProps => merge(target, _newProps)
return Object.assign(
{}, target || {}, newProps || {}
)
}
import { merge } from './merge'
const sample = {
foo : 'bar',
bar : 'bar',
}
test('merge', () => {
expect(merge(sample)({ bar : 'baz' })).toEqual({
foo : 'bar',
bar : 'baz',
})
})
/**
* https://github.com/selfrefactor/rambda/issues/77
*/
test('when undefined or null instead of object', () => {
expect(merge(null, undefined)).toEqual({})
expect(merge(sample, null)).toEqual(sample)
expect(merge(sample, undefined)).toEqual(sample)
expect(merge(undefined, sample)).toEqual(sample)
})
min<T extends Ord>(x: T, y: T): T
It returns the lesser value between x and y.
const result = [
R.min(5, 7),
R.min('bar', 'foo'),
]
// => [5, 'bar']
Try the above R.min example in Rambda REPL
min<T extends Ord>(x: T, y: T): T;
min<T extends Ord>(x: T): (y: T) => T;
export function min(x, y){
if (arguments.length === 1) return _y => min(x, _y)
return y < x ? y : x
}
import { min } from './min'
test('happy', () => {
expect(min(2, 1)).toBe(1)
expect(min(2)(1)).toBe(1)
})
minBy<T>(compareFn: (input: T) => Ord, x: T, y: T): T
It returns the lesser value between x and y according to compareFn function.
const compareFn = Math.abs
R.minBy(compareFn, -5, 2) // => -5
Try the above R.minBy example in Rambda REPL
minBy<T>(compareFn: (input: T) => Ord, x: T, y: T): T;
minBy<T>(compareFn: (input: T) => Ord, x: T): (y: T) => T;
minBy<T>(compareFn: (input: T) => Ord): FToolbelt.Curry<(x: T, y: T) => T>;
import { curry } from './curry'
export function minByFn(
compareFn, x, y
){
return compareFn(y) < compareFn(x) ? y : x
}
export const minBy = curry(minByFn)
import { minBy } from './minBy'
test('happy', () => {
expect(minBy(
Math.abs, -5, 2
)).toEqual(2)
})
test('curried', () => {
expect(minBy(Math.abs)(2, -5)).toEqual(2)
expect(minBy(Math.abs)(2)(-5)).toEqual(2)
})
modulo(x: number, y: number): number
Curried version of x%y.
R.modulo(17, 3) // => 2
Try the above R.modulo example in Rambda REPL
modulo(x: number, y: number): number;
modulo(x: number): (y: number) => number;
export function modulo(x, y){
if (arguments.length === 1) return _y => modulo(x, _y)
return x % y
}
import { modulo } from './modulo'
test('happy', () => {
expect(modulo(17, 3)).toEqual(2)
expect(modulo(15)(6)).toEqual(3)
})
multiply(x: number, y: number): number
Curried version of x*y.
R.multiply(2, 4) // => 8
Try the above R.multiply example in Rambda REPL
multiply(x: number, y: number): number;
multiply(x: number): (y: number) => number;
export function multiply(x, y){
if (arguments.length === 1) return _y => multiply(x, _y)
return x * y
}
import { multiply } from './multiply'
test('happy', () => {
expect(multiply(2, 4)).toEqual(8)
expect(multiply(2)(4)).toEqual(8)
})
negate(x: number): number
R.negate(420)// => -420
Try the above R.negate example in Rambda REPL
negate(x: number): number;
export function negate(x){
return -x
}
import { negate } from './negate'
test('negate', () => {
expect(negate(420)).toEqual(-420)
expect(negate(-13)).toEqual(13)
})
none<T>(predicate: (x: T) => boolean, list: ReadonlyArray<T>): boolean
It returns true, if all members of array list returns false, when applied as argument to predicate function.
const list = [ 0, 1, 2, 3, 4 ]
const predicate = x => x > 6
const result = R.none(predicate, arr)
// => true
Try the above R.none example in Rambda REPL
none<T>(predicate: (x: T) => boolean, list: ReadonlyArray<T>): boolean;
none<T>(predicate: (x: T) => boolean): (list: ReadonlyArray<T>) => boolean;
export function none(predicate, list){
if (arguments.length === 1) return _list => none(predicate, _list)
return list.filter(predicate).length === 0
}
import { none } from './none'
const isEven = n => n % 2 === 0
const isOdd = n => n % 2 === 1
const arr = [ 1, 3, 5, 7, 9, 11 ]
test('when true', () => {
expect(none(isEven, arr)).toBeTrue()
})
test('when false curried', () => {
expect(none(isOdd)(arr)).toBeFalse()
})
test('passes index to predicate', () => {
none((x, i) => {
expect(typeof x).toBe('number')
expect(typeof i).toBe('number')
})([ 1, 2, 3 ])
})
not(input: any): boolean
It returns a boolean negated version of input.
R.not(false) // true
Try the above R.not example in Rambda REPL
not(input: any): boolean;
export function not(input){
return !input
}
import { not } from './not'
test('not', () => {
expect(not(false)).toEqual(true)
expect(not(true)).toEqual(false)
expect(not(0)).toEqual(true)
expect(not(1)).toEqual(false)
})
nth<T>(index: number, list: ReadonlyArray<T>): T | undefined
Curried version of list[index].
const list = [1, 2, 3]
const str = 'foo'
const result = [
R.nth(2, list),
R.nth(6, list),
R.nth(0, str),
]
// => [3, undefined, 'f']
Try the above R.nth example in Rambda REPL
nth<T>(index: number, list: ReadonlyArray<T>): T | undefined;
nth(index: number): <T>(list: ReadonlyArray<T>) => T | undefined;
export function nth(index, list){
if (arguments.length === 1) return _list => nth(index, _list)
const idx = index < 0 ? list.length + index : index
return Object.prototype.toString.call(list) === '[object String]' ?
list.charAt(idx) :
list[ idx ]
}
import { nth } from './nth'
test('happy', () => {
expect(nth(2, [ 1, 2, 3, 4 ])).toEqual(3)
})
test('with curry', () => {
expect(nth(2)([ 1, 2, 3, 4 ])).toEqual(3)
})
test('with string', () => {
expect(nth(2)('foo')).toEqual('o')
})
test('with negative index', () => {
expect(nth(-3)([ 1, 2, 3, 4 ])).toEqual(2)
})
omit<T, K extends string>(propsToOmit: readonly K[], obj: T): Omit<T, K>
It returns a partial copy of an obj without propsToOmit properties.
const obj = {a: 1, b: 2, c: 3}
const propsToOmit = 'a,c,d'
const propsToOmitList = ['a', 'c', 'd']
const result = [
R.omit(propsToOmit, obj),
R.omit(propsToOmitList, obj)
]
// => [{b: 2}, {b: 2}]
Try the above R.omit example in Rambda REPL
omit<T, K extends string>(propsToOmit: readonly K[], obj: T): Omit<T, K>;
omit<K extends string>(propsToOmit: readonly K[]): <T>(obj: T) => Omit<T, K>;
omit<T, U>(propsToOmit: string, obj: T): U;
omit<T, U>(propsToOmit: string): (obj: T) => U;
omit<T>(propsToOmit: string, obj: object): T;
omit<T>(propsToOmit: string): (obj: object) => T;
export function omit(propsToOmit, obj){
if (arguments.length === 1) return _obj => omit(propsToOmit, _obj)
if (obj === null || obj === undefined){
return undefined
}
const propsToOmitValue =
typeof propsToOmit === 'string' ? propsToOmit.split(',') : propsToOmit
const willReturn = {}
for (const key in obj){
if (!propsToOmitValue.includes(key)){
willReturn[ key ] = obj[ key ]
}
}
return willReturn
}
import { omit } from './omit'
test('with string as condition', () => {
const obj = {
a : 1,
b : 2,
c : 3,
}
const result = omit('a,c', obj)
const resultCurry = omit('a,c')(obj)
const expectedResult = { b : 2 }
expect(result).toEqual(expectedResult)
expect(resultCurry).toEqual(expectedResult)
})
test('with null', () => {
expect(omit('a,b', null)).toEqual(undefined)
})
test('doesn\'t work with number as property', () => {
expect(omit([ 42 ], {
a : 1,
42 : 2,
})).toEqual({
42 : 2,
a : 1,
})
})
test('happy', () => {
expect(omit([ 'a', 'c' ])({
a : 'foo',
b : 'bar',
c : 'baz',
})).toEqual({ b : 'bar' })
})
import {omit} from 'rambda'
describe('R.omit with array as props input', () => {
it('allow Typescript to infer object type', () => {
const input = {a: 'foo', b: 2, c: 3, d: 4}
const result = omit(['b,c'], input)
result.a // $ExpectType string
result.d // $ExpectType number
const curriedResult = omit(['a,c'], input)
curriedResult.a // $ExpectType string
curriedResult.d // $ExpectType number
})
it('declare type of input object', () => {
type Input = {
a: string
b: number
c: number
d: number
}
const input: Input = {a: 'foo', b: 2, c: 3, d: 4}
const result = omit(['b,c'], input)
result // $ExpectType Pick<Input, "a" | "b" | "c" | "d">
result.a // $ExpectType string
result.d // $ExpectType number
const curriedResult = omit(['a,c'], input)
curriedResult.a // $ExpectType string
curriedResult.d // $ExpectType number
})
})
describe('R.omit with string as props input', () => {
type Output = {
b: number
d: number
}
it('explicitly declare output', () => {
const result = omit<Output>('a,c', {a: 1, b: 2, c: 3, d: 4})
result // $ExpectType Output
result.b // $ExpectType number
const curriedResult = omit<Output>('a,c')({a: 1, b: 2, c: 3, d: 4})
curriedResult.b // $ExpectType number
})
it('explicitly declare input and output', () => {
type Input = {
a: number
b: number
c: number
d: number
}
const result = omit<Input, Output>('a,c', {a: 1, b: 2, c: 3, d: 4})
result // $ExpectType Output
result.b // $ExpectType number
const curriedResult = omit<Input, Output>('a,c')({a: 1, b: 2, c: 3, d: 4})
curriedResult.b // $ExpectType number
})
it('without passing type', () => {
const result = omit('a,c', {a: 1, b: 2, c: 3, d: 4})
result // $ExpectType unknown
})
})
over<T>(lens: Lens, fn: Arity1Fn, value: T): T
It returns a copied Object or Array with modified value received by applying function fn to lens focus.
const headLens = R.lensIndex(0)
R.over(headLens, R.toUpper, ['foo', 'bar', 'baz']) //=> ['FOO', 'bar', 'baz']
Try the above R.over example in Rambda REPL
over<T>(lens: Lens, fn: Arity1Fn, value: T): T;
over<T>(lens: Lens, fn: Arity1Fn, value: readonly T[]): T[];
over(lens: Lens, fn: Arity1Fn): <T>(value: T) => T;
over(lens: Lens, fn: Arity1Fn): <T>(value: readonly T[]) => T[];
over(lens: Lens): <T>(fn: Arity1Fn, value: T) => T;
over(lens: Lens): <T>(fn: Arity1Fn, value: readonly T[]) => T[];
const Identity = x => ({
x,
map : fn => Identity(fn(x)),
})
export function over(
lens, fn, object
){
if (arguments.length === 1)
return (_fn, _object) => over(
lens, _fn, _object
)
if (arguments.length === 2) return _object => over(
lens, fn, _object
)
return lens(x => Identity(fn(x)))(object).x
}
partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, x0: V0): (x1: V1) => T
It is very similar to R.curry, but you can pass initial arguments when you create the curried function.
R.partial will keep returning a function until all the arguments that the function fn expects are passed.
The name comes from the fact that you partially inject the inputs.
const fn = (title, firstName, lastName) => {
return title + ' ' + firstName + ' ' + lastName + '!'
}
const canPassAnyNumberOfArguments = R.partial(fn, 'Hello')
const ramdaStyle = R.partial(fn, ['Hello'])
const finalFn = canPassAnyNumberOfArguments('Foo')
finalFn('Bar') // => 'Hello, Foo Bar!'
Try the above R.partial example in Rambda REPL
partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, x0: V0): (x1: V1) => T;
partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, x0: V0, x1: V1): (x2: V2) => T;
partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, x0: V0): (x1: V1, x2: V2) => T;
partial<V0, V1, V2, V3, T>(fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T, x0: V0, x1: V1, x2: V2): (x2: V3) => T;
partial<V0, V1, V2, V3, T>(fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T, x0: V0, x1: V1): (x2: V2, x3: V3) => T;
partial<V0, V1, V2, V3, T>(fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T, x0: V0): (x1: V1, x2: V2, x3: V3) => T;
partial<T>(fn: (...a: any[]) => T, ...args: any[]): (...a: any[]) => T;
export function partial(fn, ...args){
const len = fn.length
return (...rest) => {
if (args.length + rest.length >= len){
return fn(...args, ...rest)
}
return partial(fn, ...[ ...args, ...rest ])
}
}
import { partial } from './partial'
import { type } from './type'
const greet = (
salutation, title, firstName, lastName
) => salutation + ', ' + title + ' ' + firstName + ' ' + lastName + '!'
test('happy', () => {
const canPassAnyNumberOfArguments = partial(
greet, 'Hello', 'Ms.'
)
const fn = canPassAnyNumberOfArguments('foo')
const sayHello = partial(greet, [ 'Hello' ])
const sayHelloRamda = partial(sayHello, [ 'Ms.' ])
expect(type(fn)).toBe('Function')
expect(fn('bar')).toBe('Hello, Ms. foo bar!')
expect(sayHelloRamda('foo', 'bar')).toBe('Hello, Ms. foo bar!')
})
test('extra arguments are ignored', () => {
const canPassAnyNumberOfArguments = partial(
greet, 'Hello', 'Ms.'
)
const fn = canPassAnyNumberOfArguments('foo')
expect(type(fn)).toBe('Function')
expect(fn(
'bar', 1, 2
)).toBe('Hello, Ms. foo bar!')
})
test('when array is input', () => {
const fooFn = (
a, b, c, d
) => ({
a,
b,
c,
d,
})
const barFn = partial(
fooFn, [ 1, 2 ], []
)
expect(barFn(1, 2)).toEqual({
a : [ 1, 2 ],
b : [],
c : 1,
d : 2,
})
})
test('ramda spec', () => {
const sayHello = partial(greet, 'Hello')
const sayHelloToMs = partial(sayHello, 'Ms.')
expect(sayHelloToMs('Jane', 'Jones')).toBe('Hello, Ms. Jane Jones!')
})
path<Input, T>(pathToSearch: string | string[], obj: Input): T | undefined
If pathToSearch is 'a.b' then it will return 1 if obj is {a:{b:1}}.
It will return undefined, if such path is not found.
const obj = {a: {b: 1}}
const pathToSearch = 'a.b'
const pathToSearchList = ['a', 'b']
const result = [
R.path(pathToSearch, obj),
R.path(pathToSearchList, obj),
R.path('a.b.c.d', obj)
]
// => [1, 1, undefined]
Try the above R.path example in Rambda REPL
path<Input, T>(pathToSearch: string | string[], obj: Input): T | undefined;
path<T>(pathToSearch: string | string[], obj: any): T | undefined;
path<T>(pathToSearch: string | string[]): (obj: any) => T | undefined;
path<Input, T>(pathToSearch: string | string[]): (obj: Input) => T | undefined;
export function path(list, obj){
if (arguments.length === 1) return _obj => path(list, _obj)
if (obj === null || obj === undefined){
return undefined
}
let willReturn = obj
let counter = 0
const pathArrValue = typeof list === 'string' ? list.split('.') : list
while (counter < pathArrValue.length){
if (willReturn === null || willReturn === undefined){
return undefined
}
willReturn = willReturn[ pathArrValue[ counter ] ]
counter++
}
return willReturn
}
import { path } from './path'
test('with array inside object', () => {
const obj = { a : { b : [ 1, { c : 1 } ] } }
expect(path('a.b.1.c', obj)).toBe(1)
})
test('works with undefined', () => {
const obj = { a : { b : { c : 1 } } }
expect(path('a.b.c.d.f', obj)).toBeUndefined()
expect(path('foo.babaz', undefined)).toBeUndefined()
expect(path('foo.babaz')(undefined)).toBeUndefined()
})
test('works with string instead of array', () => {
expect(path('foo.bar.baz')({ foo : { bar : { baz : 'yes' } } })).toEqual('yes')
})
test('path', () => {
expect(path([ 'foo', 'bar', 'baz' ])({ foo : { bar : { baz : 'yes' } } })).toEqual('yes')
expect(path([ 'foo', 'bar', 'baz' ])(null)).toBeUndefined()
expect(path([ 'foo', 'bar', 'baz' ])({ foo : { bar : 'baz' } })).toBeUndefined()
})
import {path} from 'rambda'
interface Input {
a: number,
b: {
c: boolean,
},
}
describe('path', () => {
it('without specified input type', () => {
const input = {a: 1, b: {c: true}}
const result = path<boolean>('a.b.c', input)
const resultCurried = path<boolean>('a.b.c')(input)
result // $ExpectType boolean | undefined
resultCurried // $ExpectType boolean | undefined
})
it('without specified output type', () => {
const input = {a: 1, b: {c: true}}
const result = path('a.b.c', input)
result // $ExpectType unknown
})
it('with string as path', () => {
const input: Input = {a: 1, b: {c: true}}
const resultA = path<boolean>('a.b.c', input)
const resultB = path<boolean>('a.b.c')(input)
resultA // $ExpectType boolean | undefined
resultB // $ExpectType boolean | undefined
})
it('with array as path', () => {
const input: Input = {a: 1, b: {c: true}}
const resultA = path<boolean>(['a', 'b', 'c'], input)
const resultB = path<boolean>(['a', 'b', 'c'])(input)
resultA // $ExpectType boolean | undefined
resultB // $ExpectType boolean | undefined
})
})
describe('path with specified input', () => {
it('with string as path', () => {
const input: Input = {a: 1, b: {c: true}}
// const wrongInput = { a: 1, b: true }
// const resultA = path<Input, boolean>('a.b.c', wrongInput)
const resultA = path<Input, boolean>('a.b.c', input)
const resultB = path<Input, boolean>('a.b.c')(input)
resultA // $ExpectType boolean | undefined
resultB // $ExpectType boolean | undefined
})
it('with array as path', () => {
const input: Input = {a: 1, b: {c: true}}
const resultA = path<Input, boolean>(['a', 'b', 'c'], input)
const resultB = path<Input, boolean>(['a', 'b', 'c'])(input)
resultA // $ExpectType boolean | undefined
resultB // $ExpectType boolean | undefined
})
})
Reason for the failure: ramda method supports negative indices
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('path', function() {
var deepObject = {a: {b: {c: 'c'}}, falseVal: false, nullVal: null, undefinedVal: undefined, arrayVal: ['arr']};
it('takes a path that contains negative indices into arrays', function() {
eq(R.path(['x', -2], {x: ['a', 'b', 'c', 'd']}), 'c');
eq(R.path([-1, 'y'], [{x: 1, y: 99}, {x: 2, y: 98}, {x: 3, y: 97}]), 97);
});
});
pathOr<T>(defaultValue: T, pathToSearch: Path, obj: any): T
It reads obj input and returns either R.path(pathToSearch, obj) result or defaultValue input.
const defaultValue = 'DEFAULT_VALUE'
const pathToSearch = 'a.b'
const pathToSearchList = ['a', 'b']
const obj = {
a : {
b : 1
}
}
const result = [
R.pathOr(DEFAULT_VALUE, pathToSearch, obj)
R.pathOr(DEFAULT_VALUE, pathToSearchList, obj)
R.pathOr(DEFAULT_VALUE, 'a.b.c', obj)
]
// => [1, 1, 'DEFAULT_VALUE']
Try the above R.pathOr example in Rambda REPL
pathOr<T>(defaultValue: T, pathToSearch: Path, obj: any): T;
pathOr<T>(defaultValue: T, pathToSearch: Path): (obj: any) => T;
pathOr<T>(defaultValue: T): FToolbelt.Curry<(a: Path, b: any) => T>;
import { curry } from './curry'
import { defaultTo } from './defaultTo'
import { path } from './path'
function pathOrFn(
defaultValue, list, obj
){
return defaultTo(defaultValue, path(list, obj))
}
export const pathOr = curry(pathOrFn)
import { pathOr } from './pathOr'
test('with undefined', () => {
const result = pathOr(
'foo', 'x.y', { x : { y : 1 } }
)
expect(result).toEqual(1)
})
test('with null', () => {
const result = pathOr(
'foo', 'x.y', null
)
expect(result).toEqual('foo')
})
test('with NaN', () => {
const result = pathOr(
'foo', 'x.y', NaN
)
expect(result).toEqual('foo')
})
test('curry case (x)(y)(z)', () => {
const result = pathOr('foo')('x.y.z')({ x : { y : { a : 1 } } })
expect(result).toEqual('foo')
})
test('curry case (x)(y,z)', () => {
const result = pathOr('foo', 'x.y.z')({ x : { y : { a : 1 } } })
expect(result).toEqual('foo')
})
test('curry case (x,y)(z)', () => {
const result = pathOr('foo')('x.y.z', { x : { y : { a : 1 } } })
expect(result).toEqual('foo')
})
paths<Input, T>(pathsToSearch: Path[], obj: Input): (T | undefined)[]
It loops over members of pathsToSearch as singlePath and returns the array produced by R.path(singlePath, obj).
Because it calls R.path, then singlePath can be either string or a list.
const obj = {
a : {
b : {
c : 1,
d : 2
}
}
}
const result = R.paths([
'a.b.c',
'a.b.c.d',
'a.b.c.d.e',
], obj)
// => [1, 2, undefined]
Try the above R.paths example in Rambda REPL
paths<Input, T>(pathsToSearch: Path[], obj: Input): (T | undefined)[];
paths<Input, T>(pathsToSearch: Path[]): (obj: Input) => (T | undefined)[];
paths<T>(pathsToSearch: Path[], obj: any): (T | undefined)[];
paths<T>(pathsToSearch: Path[]): (obj: any) => (T | undefined)[];
import { path } from './path'
export function paths(pathsToSearch, obj){
if (arguments.length === 1){
return _obj => paths(pathsToSearch, _obj)
}
return pathsToSearch.map(singlePath => path(singlePath, obj))
}
import { paths } from './paths'
const obj = {
a : {
b : {
c : 1,
d : 2,
},
},
p : [ { q : 3 }, 'Hi' ],
x : {
y : 'Alice',
z : [ [ {} ] ],
},
}
test('with string path + curry', () => {
const pathsInput = [ 'a.b.d', 'p.q' ]
const expected = [ 2, undefined ]
const result = paths(pathsInput, obj)
const curriedResult = paths(pathsInput)(obj)
expect(result).toEqual(expected)
expect(curriedResult).toEqual(expected)
})
test('with array path', () => {
const result = paths([
[ 'a', 'b', 'c' ],
[ 'x', 'y' ],
],
obj)
expect(result).toEqual([ 1, 'Alice' ])
})
test('takes a paths that contains indices into arrays', () => {
expect(paths([
[ 'p', 0, 'q' ],
[ 'x', 'z', 0, 0 ],
],
obj)).toEqual([ 3, {} ])
expect(paths([
[ 'p', 0, 'q' ],
[ 'x', 'z', 2, 1 ],
],
obj)).toEqual([ 3, undefined ])
})
test('gets a deep property\'s value from objects', () => {
expect(paths([ [ 'a', 'b' ] ], obj)).toEqual([ obj.a.b ])
expect(paths([ [ 'p', 0 ] ], obj)).toEqual([ obj.p[ 0 ] ])
})
test('returns undefined for items not found', () => {
expect(paths([ [ 'a', 'x', 'y' ] ], obj)).toEqual([ undefined ])
expect(paths([ [ 'p', 2 ] ], obj)).toEqual([ undefined ])
})
import {paths} from 'rambda'
interface Input {
a: number,
b: number,
c: number,
}
const input: Input = {a: 1, b: 2, c: 3}
describe('paths', () => {
it('with dot notation', () => {
const result = paths<number>(['a.b.c', 'foo.bar'], input)
result // $ExpectType (number | undefined)[]
})
it('without type', () => {
const result = paths(['a.b.c', 'foo.bar'], input)
result // $ExpectType unknown[]
})
it('with array as path', () => {
const result = paths<number>([['a', 'b', 'c'], ['foo.bar']], input)
result // $ExpectType (number | undefined)[]
})
it('with curry', () => {
const result = paths<number>([['a', 'b', 'c'], ['foo.bar']])(input)
result // $ExpectType (number | undefined)[]
})
})
Reason for the failure: ramda method supports negative indices
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('paths', function() {
var obj = {
a: {
b: {
c: 1,
d: 2
}
},
p: [{q: 3}, 'Hi'],
x: {
y: 'Alice',
z: [[{}]]
}
};
it('takes a path that contains negative indices into arrays', function() {
eq(R.paths([['p', -2, 'q'], ['p', -1]], obj), [3, 'Hi']);
eq(R.paths([['p', -4, 'q'], ['x', 'z', -1, 0]], obj), [undefined, {}]);
});
});
pick<T, K extends string | number | symbol>(propsToPick: readonly K[], input: T): Pick<T, Exclude<keyof T, Exclude<keyof T, K>>>
It returns a partial copy of an input containing only propsToPick properties.
input can be either an object or an array.
String anotation of propsToPick is one of the differences between Rambda and Ramda.
const obj = {
a : 1,
b : false,
foo: 'cherry'
}
const list = [1, 2, 3, 4]
const propsToPick = 'a,foo'
const propsToPickList = ['a', 'foo']
const result = [
R.pick(propsToPick, obj),
R.pick(propsToPickList, obj),
R.pick('a,bar', obj),
R.pick('bar', obj),
R.pick([0, 3], list),
R.pick('0,3', list),
]
const expected = [
{a:1, foo: 'cherry'},
{a:1, foo: 'cherry'},
{a:1},
{},
[1,4],
[1,4]
]
// => `result` is equal to `expected`
Try the above R.pick example in Rambda REPL
pick<T, K extends string | number | symbol>(propsToPick: readonly K[], input: T): Pick<T, Exclude<keyof T, Exclude<keyof T, K>>>;
pick<K extends string | number | symbol>(propsToPick: readonly K[]): <T>(input: T) => Pick<T, Exclude<keyof T, Exclude<keyof T, K>>>;
pick<T, U>(propsToPick: string, input: T): U;
pick<T, U>(propsToPick: string): (input: T) => U;
pick<T>(propsToPick: string, input: object): T;
pick<T>(propsToPick: string): (input: object) => T;
export function pick(propsToPick, input){
if (arguments.length === 1) return _input => pick(propsToPick, _input)
if (input === null || input === undefined){
return undefined
}
const keys =
typeof propsToPick === 'string' ? propsToPick.split(',') : propsToPick
const willReturn = {}
let counter = 0
while (counter < keys.length){
if (keys[ counter ] in input){
willReturn[ keys[ counter ] ] = input[ keys[ counter ] ]
}
counter++
}
return willReturn
}
import { pick } from './pick'
test('props to pick is a string', () => {
const obj = {
a : 1,
b : 2,
c : 3,
}
const result = pick('a,c', obj)
const resultCurry = pick('a,c')(obj)
const expectedResult = {
a : 1,
c : 3,
}
expect(result).toEqual(expectedResult)
expect(resultCurry).toEqual(expectedResult)
})
test('props to pick is an array', () => {
expect(pick([ 'a', 'c' ])({
a : 'foo',
b : 'bar',
c : 'baz',
})).toEqual({
a : 'foo',
c : 'baz',
})
expect(pick([ 'a', 'd', 'e', 'f' ])({
a : 'foo',
b : 'bar',
c : 'baz',
})).toEqual({ a : 'foo' })
expect(pick('a,d,e,f')(null)).toEqual(undefined)
})
test('works with list as input and number as props - props to pick is an array', () => {
const result = pick([ 1, 2 ], [ 'a', 'b', 'c', 'd' ])
expect(result).toEqual({
1 : 'b',
2 : 'c',
})
})
test('works with list as input and number as props - props to pick is a string', () => {
const result = pick('1,2', [ 'a', 'b', 'c', 'd' ])
expect(result).toEqual({
1 : 'b',
2 : 'c',
})
})
test('with symbol', () => {
const symbolProp = Symbol('s')
expect(pick([ symbolProp ], { [ symbolProp ] : 'a' })).toMatchInlineSnapshot(`
Object {
Symbol(s): "a",
}
`)
})
import {pick} from 'rambda'
describe('pick with array as props input', () => {
type Input = {
a: string
b: number
c: number
d: number
}
it('need to declare the types of input and props to pick - string as prop', () => {
const input = {a: 'foo', b: 2, c: 3, d: 4}
const result = pick<Input, string>(['a,c'], input)
result // $ExpectType Pick<Input, "a" | "b" | "c" | "d">
result.a // $ExpectType string
result.b // $ExpectType number
const curriedResult = pick<Input, string>(['a,c'], input)
curriedResult // $ExpectType Pick<Input, "a" | "b" | "c" | "d">
})
it('need to declare the types of input and props to pick - number as prop', () => {
const result = pick<Array<string>, number>([1, 2], ["a", "b", "c", "d"]);
result[1] // $ExpectType string
result[2] // $ExpectType string
result[3] // should not be possible but it is
})
it('need to declare the types of input and props to pick - symbol as prop', () => {
const symbolProp = Symbol('s')
const result = pick([ symbolProp ], { [ symbolProp ] : 'a' })
result // $ExpectType Pick<{ [symbolProp]: string; }, typeof symbolProp>
})
})
describe('R.pick with string as props input', () => {
type Output = {
a: number
c: number
}
it('explicitly declare output', () => {
const result = pick<Output>('a,c', {a: 1, b: 2, c: 3, d: 4})
result // $ExpectType Output
result.a // $ExpectType number
const curriedResult = pick<Output>('a,c')({a: 1, b: 2, c: 3, d: 4})
curriedResult.a // $ExpectType number
})
it('explicitly declare input and output', () => {
type Input = {
a: number
b: number
c: number
d: number
}
const result = pick<Input, Output>('a,c', {a: 1, b: 2, c: 3, d: 4})
result // $ExpectType Output
result.a // $ExpectType number
const curriedResult = pick<Input, Output>('a,c')({a: 1, b: 2, c: 3, d: 4})
curriedResult.a // $ExpectType number
})
it('without passing type', () => {
const result = pick('a,c', {a: 1, b: 2, c: 3, d: 4})
result // $ExpectType unknown
})
})
pickAll<T, U>(propsToPick: ReadonlyArray<string>, obj: T): U
Same as R.pick but it won't skip the missing props, i.e. it will assign them to undefined.
const obj = {
a : 1,
b : false,
foo: 'cherry'
}
const propsToPick = 'a,foo,bar'
const propsToPickList = ['a', 'foo', 'bar']
const result = [
R.pickAll(propsToPick, obj),
R.pickAll(propsToPickList, obj),
R.pickAll('a,bar', obj),
R.pickAll('bar', obj),
]
const expected = [
{a:1, foo: 'cherry', bar: undefined},
{a:1, foo: 'cherry', bar: undefined},
{a:1, bar: undefined},
{bar: undefined}
]
// => `result` is equal to `expected`
Try the above R.pickAll example in Rambda REPL
pickAll<T, U>(propsToPick: ReadonlyArray<string>, obj: T): U;
pickAll(propsToPick: ReadonlyArray<string>): <T, U>(obj: T) => U;
export function pickAll(propsToPick, obj){
if (arguments.length === 1) return _obj => pickAll(propsToPick, _obj)
if (obj === null || obj === undefined){
return undefined
}
const keysValue =
typeof propsToPick === 'string' ? propsToPick.split(',') : propsToPick
const willReturn = {}
let counter = 0
while (counter < keysValue.length){
if (keysValue[ counter ] in obj){
willReturn[ keysValue[ counter ] ] = obj[ keysValue[ counter ] ]
} else {
willReturn[ keysValue[ counter ] ] = undefined
}
counter++
}
return willReturn
}
import { pickAll } from './pickAll'
test('when input is undefined or null', () => {
expect(pickAll('a', null)).toBe(undefined)
expect(pickAll('a', undefined)).toBe(undefined)
})
test('with string as condition', () => {
const obj = {
a : 1,
b : 2,
c : 3,
}
const result = pickAll('a,c', obj)
const resultCurry = pickAll('a,c')(obj)
const expectedResult = {
a : 1,
b : undefined,
c : 3,
}
expect(result).toEqual(expectedResult)
expect(resultCurry).toEqual(expectedResult)
})
test('with array as condition', () => {
expect(pickAll([ 'a', 'b', 'c' ], {
a : 'foo',
c : 'baz',
})).toEqual({
a : 'foo',
b : undefined,
c : 'baz',
})
})
pipe<T1>(fn0: () => T1): () => T1
It performs left-to-right function composition.
const result = R.pipe(
R.filter(val => val > 2),
R.map(a => a * 2)
)([1, 2, 3, 4])
// => [6, 8]
Try the above R.pipe example in Rambda REPL
pipe<T1>(fn0: () => T1): () => T1;
pipe<V0, T1>(fn0: (x0: V0) => T1): (x0: V0) => T1;
pipe<V0, V1, T1>(fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T1;
pipe<V0, V1, V2, T1>(fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T1;
import { compose } from './compose'
export function pipe(...fns){
if (fns.length === 0)
throw new Error('pipe requires at least one argument')
return compose(...fns.reverse())
}
import { add, last, map } from '../rambda'
import { pipe } from './pipe'
test('happy', () => {
const list = [ 1, 2, 3 ]
const result = pipe(
map(add(1)), map(add(10)), last
)(list)
expect(result).toEqual(14)
})
test('with bad input', () => {
expect(() => pipe()).toThrow('pipe requires at least one argument')
})
Reason for the failure: ramda passes context to functions | rambda composed functions have no length
var assert = require('assert');
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('pipe', function() {
it('performs left-to-right function composition', function() {
// f :: (String, Number?) -> ([Number] -> [Number])
var f = R.pipe(parseInt, R.multiply, R.map);
eq(f.length, 2);
eq(f('10')([1, 2, 3]), [10, 20, 30]);
eq(f('10', 2)([1, 2, 3]), [2, 4, 6]);
});
it('passes context to functions', function() {
function x(val) {
return this.x * val;
}
function y(val) {
return this.y * val;
}
function z(val) {
return this.z * val;
}
var context = {
a: R.pipe(x, y, z),
x: 4,
y: 2,
z: 1
};
eq(context.a(5), 40);
});
it('can be applied to one argument', function() {
var f = function(a, b, c) { return [a, b, c]; };
var g = R.pipe(f);
eq(g.length, 3);
eq(g(1, 2, 3), [1, 2, 3]);
});
});
pluck<T>(property: number, list: ReadonlyArray<T>): T
It returns list of the values of property taken from the all objects inside list.
const list = [{a: 1}, {a: 2}, {b: 3}]
const property = 'a'
R.pluck(list, property)
// => [1, 2]
Try the above R.pluck example in Rambda REPL
pluck<T>(property: number, list: ReadonlyArray<T>): T;
pluck<K extends keyof T, T>(property: K, list: ReadonlyArray<T>): T[K][];
pluck(property: number): <T>(list: ReadonlyArray<T>) => T;
pluck<P extends string>(property: P): <T>(list: ReadonlyArray<Record<P, T>>) => T[];
import { map } from './map'
export function pluck(property, list){
if (arguments.length === 1) return _list => pluck(property, _list)
const willReturn = []
map(x => {
if (x[ property ] !== undefined){
willReturn.push(x[ property ])
}
}, list)
return willReturn
}
import { pluck } from './pluck'
test('happy', () => {
expect(pluck('a')([ { a : 1 }, { a : 2 }, { b : 1 } ])).toEqual([ 1, 2 ])
})
test('with number', () => {
const input = [
[ 1, 2 ],
[ 3, 4 ],
]
expect(pluck(0, input)).toEqual([ 1, 3 ])
})
import {pluck} from 'rambda'
describe('pluck', () => {
it('with object', () => {
interface ListMember {
a: number,
b: string,
}
const input: ListMember[] = [
{a: 1, b: 'foo'},
{a: 2, b: 'bar'},
]
const resultA = pluck('a', input)
const resultB = pluck('b')(input)
resultA // $ExpectType number[]
resultB // $ExpectType string[]
})
it('with array', () => {
const input = [
[1, 2],
[3, 4],
[5, 6],
]
const result = pluck(0, input)
const resultCurry = pluck(0)(input)
result // $ExpectType number[]
resultCurry // $ExpectType number[]
})
})
Reason for the failure: ramda method behaves as a transducer
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('pluck', function() {
var people = [
{name: 'Fred', age: 23},
{name: 'Wilma', age: 21},
{name: 'Pebbles', age: 2}
];
it('behaves as a transducer when given a transducer in list position', function() {
var numbers = [{a: 1}, {a: 2}, {a: 3}, {a: 4}];
var transducer = R.compose(R.pluck('a'), R.map(R.add(1)), R.take(2));
eq(R.transduce(transducer, R.flip(R.append), [], numbers), [2, 3]);
});
});
prepend<T>(x: T, listOrString: ReadonlyArray<T>): T[]
It adds element x at the beginning of listOrString.
const x = 'foo'
const result = [
R.prepend(x, '_cherry'),
R.prepend(x, ['bar', 'baz'])
]
// => ['foo_cherry', ['foo', 'bar', 'baz']]
Try the above R.prepend example in Rambda REPL
prepend<T>(x: T, listOrString: ReadonlyArray<T>): T[];
prepend<T>(x: T): (listOrString: ReadonlyArray<T>) => T[];
export function prepend(x, listOrString){
if (arguments.length === 1)
return _listOrString => prepend(x, _listOrString)
if (typeof listOrString === 'string') return `${ x }${ listOrString }`
return [ x ].concat(listOrString)
}
import { prepend } from './prepend'
test('happy', () => {
expect(prepend('f', 'oo')).toEqual('foo')
})
test('prepend', () => {
expect(prepend('yes', [ 'foo', 'bar', 'baz' ])).toEqual([
'yes',
'foo',
'bar',
'baz',
])
expect(prepend('foo')([])).toEqual([ 'foo' ])
})
product(list: ReadonlyArray<number>): number
R.product([ 2, 3, 4 ])
// => 24)
Try the above R.product example in Rambda REPL
product(list: ReadonlyArray<number>): number;
import { multiply } from './multiply'
import { reduce } from './reduce'
export const product = reduce(multiply, 1)
import { product } from './product'
test('happy', () => {
expect(product([ 2, 3, 4 ])).toEqual(24)
})
test('bad input', () => {
expect(product([ null ])).toEqual(0)
expect(product([])).toEqual(1)
})
prop<P extends keyof T, T>(propToFind: P, obj: T): T[P]
It returns the value of property propToFind in obj.
If there is no such property, it returns undefined.
const result = [
R.prop('x', {x: 100}),
R.prop('x', {a: 1})
]
// => [100, undefined]
Try the above R.prop example in Rambda REPL
prop<P extends keyof T, T>(propToFind: P, obj: T): T[P];
prop<P extends string>(p: P): <T>(propToFind: Record<P, T>) => T;
prop<P extends string, T>(p: P): (propToFind: Record<P, T>) => T;
export function prop(propToFind, obj){
if (arguments.length === 1) return _obj => prop(propToFind, _obj)
if (!obj) return undefined
return obj[ propToFind ]
}
import { prop } from './prop'
test('prop', () => {
expect(prop('foo')({ foo : 'baz' })).toEqual('baz')
expect(prop('bar')({ foo : 'baz' })).toEqual(undefined)
expect(prop('bar')(null)).toEqual(undefined)
})
propEq<T>(propToFind: string | number, valueToMatch: T, obj: any): boolean
It returns true if obj has property propToFind and its value is equal to valueToMatch.
const obj = { foo: 'bar' }
const secondObj = { foo: 1 }
const propToFind = 'foo'
const valueToMatch = 'bar'
const result = [
R.propEq(propToFind, valueToMatch, obj),
R.propEq(propToFind, valueToMatch, secondObj)
]
// => [true, false]
Try the above R.propEq example in Rambda REPL
propEq<T>(propToFind: string | number, valueToMatch: T, obj: any): boolean;
propEq<T>(propToFind: string | number, valueToMatch: T): (obj: any) => boolean;
propEq(propToFind: string | number): {
<T>(valueToMatch: T, obj: any): boolean;
<T>(valueToMatch: T): (obj: any) => boolean;
};
import { curry } from './curry'
function propEqFn(
propToFind, valueToMatch, obj
){
if (!obj) return false
return obj[ propToFind ] === valueToMatch
}
export const propEq = curry(propEqFn)
import { propEq } from './propEq'
test('happy', () => {
expect(propEq('foo', 'bar')({ foo : 'bar' })).toBeTrue()
expect(propEq('foo', 'bar')({ foo : 'baz' })).toBeFalse()
expect(propEq('foo')('bar')({ foo : 'baz' })).toBeFalse()
expect(propEq(
'foo', 'bar', null
)).toBeFalse()
})
Reason for the failure: ramda method pass to
equalsmethod if available
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('propEq', function() {
var obj1 = {name: 'Abby', age: 7, hair: 'blond'};
var obj2 = {name: 'Fred', age: 12, hair: 'brown'};
it('handles number as property', function() {
var deities = ['Cthulhu', 'Dagon', 'Yog-Sothoth'];
eq(R.propEq(0, 'Cthulhu', deities), true);
eq(R.propEq(1, 'Dagon', deities), true);
eq(R.propEq(2, 'Yog-Sothoth', deities), true);
eq(R.propEq(-1, 'Yog-Sothoth', deities), true);
eq(R.propEq(3, undefined, deities), true);
});
it('has R.equals semantics', function() {
function Just(x) { this.value = x; }
Just.prototype.equals = function(x) {
return x instanceof Just && R.equals(x.value, this.value);
};
eq(R.propEq('value', 0, {value: -0}), false);
eq(R.propEq('value', -0, {value: 0}), false);
eq(R.propEq('value', NaN, {value: NaN}), true);
eq(R.propEq('value', new Just([42]), {value: new Just([42])}), true);
});
});
propIs(type: any, name: string, obj: any): boolean
It returns true if property of obj is from target type.
const obj = {a:1, b: 'foo'}
const property = 'foo'
const result = [
R.propIs(String, property, obj),
R.propIs(Number, property, obj)
]
// => [true, false]
Try the above R.propIs example in Rambda REPL
propIs(type: any, name: string, obj: any): boolean;
propIs(type: any, name: string): (obj: any) => boolean;
propIs(type: any): {
(name: string, obj: any): boolean;
(name: string): (obj: any) => boolean;
};
import { curry } from './curry.js'
import { is } from './is'
function propIsFn(
targetPrototype, property, obj
){
return is(targetPrototype, obj[ property ])
}
export const propIs = curry(propIsFn)
import { propIs } from './propIs'
const obj = { value : 1 }
const property = 'value'
test('when true', () => {
expect(propIs(
Number, property, obj
)).toBeTrue()
})
test('when false', () => {
expect(propIs(
String, property, obj
)).toBeFalse()
expect(propIs(
String, property, {}
)).toBeFalse()
})
import {propIs} from 'rambda'
const property = 'a'
const obj = {a: 1}
describe('propIs', () => {
it('happy', () => {
const result = propIs(
Number, property, obj
)
result // $ExpectType boolean
})
it('curried', () => {
const result = propIs(Number, property)(obj)
result // $ExpectType boolean
})
})
propOr<T, U, V>(defaultValue: T, property: string, obj: U): V
It returns either defaultValue or the value of property in obj.
const obj = {a: 1}
const defaultValue = 'DEFAULT_VALUE'
const property = 'a'
const result = [
R.propOr(defaultValue, property, obj),
R.propOr(defaultValue, 'foo', obj)
]
// => [1, 'DEFAULT_VALUE']
Try the above R.propOr example in Rambda REPL
propOr<T, U, V>(defaultValue: T, property: string, obj: U): V;
propOr<T>(defaultValue: T, property: string): <U, V>(obj: U) => V;
propOr<T>(defaultValue: T): <U, V>(property: string, obj: U) => V;
import { curry } from './curry'
import { defaultTo } from './defaultTo'
function propOrFn(
defaultValue, property, obj
){
if (!obj) return defaultValue
return defaultTo(defaultValue, obj[ property ])
}
export const propOr = curry(propOrFn)
import { propOr } from './propOr'
test('propOr (result)', () => {
const obj = { a : 1 }
expect(propOr(
'default', 'a', obj
)).toEqual(1)
expect(propOr(
'default', 'notExist', obj
)).toEqual('default')
expect(propOr(
'default', 'notExist', null
)).toEqual('default')
})
test('propOr (currying)', () => {
const obj = { a : 1 }
expect(propOr('default')('a', obj)).toEqual(1)
expect(propOr('default', 'a')(obj)).toEqual(1)
expect(propOr('default')('notExist', obj)).toEqual('default')
expect(propOr('default', 'notExist')(obj)).toEqual('default')
})
range(start: number, end: number): number[]
It returns list of numbers between start(inclusive) to end(exclusive) numbers.
R.range(0, 5)
// => [0, 1, 2, 3, 4]
Try the above R.range example in Rambda REPL
range(start: number, end: number): number[];
range(start: number): (end: number) => number[];
export function range(start, end){
if (arguments.length === 1) return _end => range(start, _end)
if (Number.isNaN(Number(start)) || Number.isNaN(Number(end))){
throw new TypeError('Both arguments to range must be numbers')
}
if (end < start) return []
const len = end - start
const willReturn = Array(len)
for (let i = 0; i < len; i++){
willReturn[ i ] = start + i
}
return willReturn
}
import { range } from './range'
test('happy', () => {
expect(range(0, 10)).toEqual([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ])
})
test('end range is bigger than start range', () => {
expect(range(7, 3)).toEqual([])
expect(range(5, 5)).toEqual([])
})
test('with bad input', () => {
const throwMessage = 'Both arguments to range must be numbers'
expect(() => range('a', 6)).toThrow(throwMessage)
expect(() => range(6, 'z')).toThrow(throwMessage)
})
test('curry', () => {
expect(range(0)(10)).toEqual([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ])
})
reduce<T, TResult>(reducer: (prev: TResult, current: T, i: number) => TResult, initialValue: TResult, list: ReadonlyArray<T>): TResult
const list = [1, 2, 3]
const initialValue = 10
const reducer = (prev, current) => prev * current
const result = R.reduce(reducer, initialValue, list)
// => 60
Try the above R.reduce example in Rambda REPL
reduce<T, TResult>(reducer: (prev: TResult, current: T, i: number) => TResult, initialValue: TResult, list: ReadonlyArray<T>): TResult;
reduce<T, TResult>(reducer: (prev: TResult, current: T) => TResult, initialValue: TResult, list: ReadonlyArray<T>): TResult;
reduce<T, TResult>(reducer: (prev: TResult, current: T, i?: number) => TResult): (initialValue: TResult, list: ReadonlyArray<T>) => TResult;
reduce<T, TResult>(reducer: (prev: TResult, current: T, i?: number) => TResult, initialValue: TResult): (list: ReadonlyArray<T>) => TResult;
import { curry } from './curry'
function reduceFn(
reducer, acc, list
){
const clone = list.slice()
return clone.reduce(reducer, acc)
}
export const reduce = curry(reduceFn)
import { reduce } from './reduce'
test('happy', () => {
const reducer = (
prev, current, i
) => {
expect(i).toBeNumber()
return prev + current
}
const initialValue = 1
const list = [ 1, 2, 3 ]
expect(reduce(
reducer, initialValue, list
)).toEqual(7)
})
import {reduce} from 'rambda'
describe('reduce', () => {
it('happy', () => {
const result = reduce<number, number>(
(acc, elem) => {
acc // $ExpectType number
elem // $ExpectType number
return acc + elem
},
1,
[1, 2, 3]
)
result // $ExpectType number
})
it('with two types', () => {
const result = reduce<number, string>(
(acc, elem) => {
acc // $ExpectType string
elem // $ExpectType number
return `${acc}${elem}`
},
'foo',
[1, 2, 3]
)
result // $ExpectType string
})
it('with index', () => {
const result = reduce<number, number>(
(acc, elem, i) => {
acc // $ExpectType number
elem // $ExpectType number
i // $ExpectType number
return acc + elem
},
1,
[1, 2, 3]
)
result // $ExpectType number
})
it('fallback', () => {
const result = reduce(
(acc, val) => {
acc // $ExpectType number
return acc + val
},
1,
[1, 2, 3]
)
result // $ExpectType number
})
it('fallback with index', () => {
const result = reduce(
(acc, val, i) => {
acc // $ExpectType number
i // $ExpectType number
return acc + val
},
1,
[1, 2, 3]
)
result // $ExpectType number
})
it('fallback with two types', () => {
const result = reduce(
(acc, val) => {
acc // $ExpectType string
return acc + val
},
'foo',
[1, 2, 3]
)
result // $ExpectType string
})
})
Reason for the failure: rambda doesn't have
R.reducedmethod | ramda method pass toreducemethod
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('reduce', function() {
var add = function(a, b) {return a + b;};
var mult = function(a, b) {return a * b;};
it('Prefers the use of the iterator of an object over reduce (and handles short-circuits)', function() {
var symIterator = (typeof Symbol !== 'undefined') ? Symbol.iterator : '@@iterator';
function Reducible(arr) {
this.arr = arr;
}
Reducible.prototype.reduce = function(f, init) {
var acc = init;
for (var i = 0; i < this.arr.length; i += 1) {
acc = f(acc, this.arr[i]);
}
return acc;
};
Reducible.prototype[symIterator] = function() {
var a = this.arr;
return {
_pos: 0,
next: function() {
if (this._pos < a.length) {
var v = a[this._pos];
this._pos += 1;
return {
value: v,
done: false
};
} else {
return {
done: true
};
}
}
};
};
var xf = R.take(2);
var apendingT = { };
apendingT['@@transducer/result'] = R.identity;
apendingT['@@transducer/step'] = R.flip(R.append);
var rfn = xf(apendingT);
var list = new Reducible([1, 2, 3, 4, 5, 6]);
eq(R.reduce(rfn, [], list), [1, 2]);
});
it('short circuits with reduced', function() {
var addWithMaxOf10 = function(acc, val) {return acc + val > 10 ? R.reduced(acc) : acc + val;};
eq(R.reduce(addWithMaxOf10, 0, [1, 2, 3, 4]), 10);
eq(R.reduce(addWithMaxOf10, 0, [2, 4, 6, 8]), 6);
});
});
reject<T>(predicate: FilterFunctionArray<T>): (x: T[]) => T[]
It has the opposite effect of R.filter.
It will return those members of list that return false when applied to predicate function.
const list = [1, 2, 3, 4]
const predicate = x => x > 2
const result = [
R.reject(predicate, list)
]
// => [1, 2]
Try the above R.reject example in Rambda REPL
reject<T>(predicate: FilterFunctionArray<T>): (x: T[]) => T[];
reject<T>(predicate: FilterFunctionArray<T>, x: T[]): T[];
reject<T, U>(predicate: FilterFunctionObject<T>): (x: Dictionary<T>) => Dictionary<T>;
reject<T>(predicate: FilterFunctionObject<T>, x: Dictionary<T>): Dictionary<T>;
import { filter } from './filter'
export function reject(predicate, list){
if (arguments.length === 1) return _list => reject(predicate, _list)
return filter((x, i) => !predicate(x, i), list)
}
import { reject } from './reject'
const isOdd = n => n % 2 === 1
test('with array', () => {
expect(reject(isOdd, [ 1, 2, 3, 4 ])).toEqual([ 2, 4 ])
})
test('with object', () => {
expect(reject(isOdd, {
a : 1,
b : 2,
c : 3,
d : 4,
})).toEqual({
b : 2,
d : 4,
})
})
test('pass index as second argument', () => {
reject((x, i) => {
expect(typeof x).toBe('number')
expect(typeof i).toBe('number')
},
[ 10, 12, 15 ])
})
import {reject} from 'rambda'
describe('reject with array', () => {
it('1 curry', () => {
const x = reject<number>(a => {
a // $ExpectType number
return a > 1
})([1, 2, 3])
x // $ExpectType number[]
})
it('1', () => {
const x = reject<number>(
a => {
a // $ExpectType number
return a > 1
},
[1, 2, 3]
)
x // $ExpectType number[]
})
it('2', () => {
const x = reject<number>(
(a, b) => {
a // $ExpectType number
return a > 1
},
[1, 2, 3]
)
x // $ExpectType number[]
})
})
describe('reject with objects', () => {
it('curry', () => {
const x = reject<number, number>((a, b, c) => {
b // $ExpectType string
c // $ExpectType Dictionary<number>
return a > 1
})({a: 1, b: 2})
x // $ExpectType Dictionary<number>
})
it('object with three arguments predicate', () => {
const x = reject<number>(
(a, b, c) => {
b // $ExpectType string
c // $ExpectType Dictionary<number>
return a > 1
},
{a: 1, b: 2}
)
x // $ExpectType Dictionary<number>
})
it('object with two arguments predicate', () => {
const x = reject<number>(
(a, b) => {
b // $ExpectType string
return a > 1
},
{a: 1, b: 2}
)
x // $ExpectType Dictionary<number>
})
it('object with one argument predicate', () => {
const x = reject<number>(
a => {
a // $ExpectType number
return a > 1
},
{a: 1, b: 2}
)
x // $ExpectType Dictionary<number>
})
})
Reason for the failure: ramda method dispatches to
filtermethod
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('reject', function() {
var even = function(x) {return x % 2 === 0;};
it('dispatches to `filter` method', function() {
function Nothing() {}
Nothing.value = new Nothing();
Nothing.prototype.filter = function() {
return this;
};
function Just(x) { this.value = x; }
Just.prototype.filter = function(pred) {
return pred(this.value) ? this : Nothing.value;
};
var m = new Just(42);
eq(R.filter(R.T, m), m);
eq(R.filter(R.F, m), Nothing.value);
eq(R.reject(R.T, m), Nothing.value);
eq(R.reject(R.F, m), m);
});
});
repeat<T>(x: T, timesToRepeat: number): T[]
It returns a list of x input repeated timesToRepeat input.
R.repeat('foo', 3)
// => ['foo', 'foo', 'foo']
Try the above R.repeat example in Rambda REPL
repeat<T>(x: T, timesToRepeat: number): T[];
repeat<T>(x: T): (timesToRepeat: number) => T[];
export function repeat(x, timesToRepeat){
if (arguments.length === 1){
return _timesToRepeat => repeat(x, _timesToRepeat)
}
return Array(timesToRepeat).fill(x)
}
import { repeat } from './repeat'
test('repeat', () => {
expect(repeat('')(3)).toEqual([ '', '', '' ])
expect(repeat('foo', 3)).toEqual([ 'foo', 'foo', 'foo' ])
const obj = {}
const arr = repeat(obj, 3)
expect(arr).toEqual([ {}, {}, {} ])
expect(arr[ 0 ] === arr[ 1 ]).toBeTrue()
})
replace(strOrRegex: RegExp | string, replacer: string, str: string): string
It replaces strOrRegex found in str with replacer.
const strOrRegex = /o/g
const result = R.replace(strOrRegex, '|0|', 'foo')
// => 'f|0||0|'
Try the above R.replace example in Rambda REPL
replace(strOrRegex: RegExp | string, replacer: string, str: string): string;
replace(strOrRegex: RegExp | string, replacer: string): (str: string) => string;
replace(strOrRegex: RegExp | string): (replacer: string) => (str: string) => string;
export function replace(
pattern, replacer, str
){
if (replacer === undefined){
return (_replacer, _str) => replace(
pattern, _replacer, _str
)
} else if (str === undefined){
return _str => replace(
pattern, replacer, _str
)
}
return str.replace(pattern, replacer)
}
import { replace } from './replace'
test('happy', () => {
expect(replace(
'foo', 'yes', 'foo bar baz'
)).toEqual('yes bar baz')
})
test('1', () => {
expect(replace(/\s/g)('|')('foo bar baz')).toEqual('foo|bar|baz')
})
test('2', () => {
expect(replace(/\s/g)('|', 'foo bar baz')).toEqual('foo|bar|baz')
})
test('3', () => {
expect(replace(/\s/g, '|')('foo bar baz')).toEqual('foo|bar|baz')
})
reverse<T>(listOrString: ReadonlyArray<T>): T[]
It returns a reversed copy of listOrString input.
const result = [
R.reverse('foo'),
R.reverse([1, 2, 3])
]
// => ['oof', [3, 2, 1]
Try the above R.reverse example in Rambda REPL
reverse<T>(listOrString: ReadonlyArray<T>): T[];
reverse(listOrString: string): string;
export function reverse(listOrString){
if (typeof listOrString === 'string'){
return listOrString.split('').reverse()
.join('')
}
const clone = listOrString.slice()
return clone.reverse()
}
import { reverse } from './reverse'
test('happy', () => {
expect(reverse([ 1, 2, 3 ])).toEqual([ 3, 2, 1 ])
})
test('with string', () => {
expect(reverse('baz')).toEqual('zab')
})
test('it doesn\'t mutate', () => {
const arr = [ 1, 2, 3 ]
expect(reverse(arr)).toEqual([ 3, 2, 1 ])
expect(arr).toEqual([ 1, 2, 3 ])
})
set<T, U>(lens: Lens, replacer: U, obj: T): T
It returns a copied Object or Array with modified lens focus set to replacer value.
const input = {x: 1, y: 2}
const xLens = R.lensProp('x')
R.set(xLens, 4, input) //=> {x: 4, y: 2}
R.set(xLens, 8, input) //=> {x: 8, y: 2}
Try the above R.set example in Rambda REPL
set<T, U>(lens: Lens, replacer: U, obj: T): T;
set<U>(lens: Lens, replacer: U): <T>(obj: T) => T;
set(lens: Lens): <T, U>(replacer: U, obj: T) => T;
import { always } from './always'
import { over } from './over'
export function set(
lens, replacer, x
){
if (arguments.length === 1) return (_v, _x) => set(
lens, _v, _x
)
if (arguments.length === 2) return _x => set(
lens, replacer, _x
)
return over(
lens, always(replacer), x
)
}
slice(from: number, to: number, list: string): string
It returns listOrString between from and to indexes.
const list = [0, 1, 2, 3, 4, 5]
const str = 'FOO_BAR'
const from = 1
const to = 4
const result = [
R.slice(str, to, list),
R.slice(from, to, list)
]
// => ['OO_', [1, 2, 3]]
Try the above R.slice example in Rambda REPL
slice(from: number, to: number, list: string): string;
slice<T>(from: number, to: number, list: T[]): T[];
slice(from: number, to: number): {
(list: string): string;
<T>(list: T[]): T[];
};
slice(from: number): {
(to: number, list: string): string;
<T>(to: number, list: T[]): T[];
};
import { curry } from './curry'
function sliceFn(
from, to, list
){
return list.slice(from, to)
}
export const slice = curry(sliceFn)
import { slice } from './slice'
test('slice', () => {
expect(slice(
1, 3, [ 'a', 'b', 'c', 'd' ]
)).toEqual([ 'b', 'c' ])
expect(slice(
1, Infinity, [ 'a', 'b', 'c', 'd' ]
)).toEqual([ 'b', 'c', 'd' ])
expect(slice(
0, -1, [ 'a', 'b', 'c', 'd' ]
)).toEqual([ 'a', 'b', 'c' ])
expect(slice(
-3, -1, [ 'a', 'b', 'c', 'd' ]
)).toEqual([ 'b', 'c' ])
expect(slice(
0, 3, 'ramda'
)).toEqual('ram')
})
sort<T>(sortFn: (a: T, b: T) => number, list: ReadonlyArray<T>): T[]
It returns copy of list sorted by sortFn function.
const list = [
{a: 2},
{a: 3},
{a: 1}
]
const sortFn = (x, y) => {
return x.a > y.a ? 1 : -1
}
const result = R.sort(list, sortFn)
const expected = [
{a: 1},
{a: 2},
{a: 3}
]
// => `result` is equal to `expected`
Try the above R.sort example in Rambda REPL
sort<T>(sortFn: (a: T, b: T) => number, list: ReadonlyArray<T>): T[];
sort<T>(sortFn: (a: T, b: T) => number): (list: ReadonlyArray<T>) => T[];
export function sort(sortFn, list){
if (arguments.length === 1) return _list => sort(sortFn, _list)
const clone = list.slice()
return clone.sort(sortFn)
}
import { sort } from './sort'
const fn = (a, b) => a > b ? 1 : -1
test('sort', () => {
expect(sort((a, b) => a - b)([ 2, 3, 1 ])).toEqual([ 1, 2, 3 ])
})
test('it doesn\'t mutate', () => {
const list = [ 'foo', 'bar', 'baz' ]
expect(sort(fn, list)).toEqual([ 'bar', 'baz', 'foo' ])
expect(list[ 0 ]).toBe('foo')
expect(list[ 1 ]).toBe('bar')
expect(list[ 2 ]).toBe('baz')
})
sortBy<T>(sortFn: (a: T) => Ord, list: ReadonlyArray<T>): T[]
It returns copy of list sorted by sortFn function.
const list = [
{a: 2},
{a: 3},
{a: 1}
]
const sortFn = x => x.a
const result = R.sortBy(list, sortFn)
const expected = [
{a: 1},
{a: 2},
{a: 3}
]
// => `result` is equal to `expected`
Try the above R.sortBy example in Rambda REPL
sortBy<T>(sortFn: (a: T) => Ord, list: ReadonlyArray<T>): T[];
sortBy(sortFn: (a: any) => Ord): <T>(list: ReadonlyArray<T>) => T[];
export function sortBy(sortFn, list){
if (arguments.length === 1) return _list => sortBy(sortFn, _list)
const clone = list.slice()
return clone.sort((a, b) => {
const aSortResult = sortFn(a)
const bSortResult = sortFn(b)
if (aSortResult === bSortResult) return 0
return aSortResult < bSortResult ? -1 : 1
})
}
import { compose } from './compose'
import { prop } from './prop'
import { sortBy } from './sortBy'
import { toLower } from './toLower.js'
test('happy', () => {
const input = [ { a : 2 }, { a : 1 }, { a : 1 }, { a : 3 } ]
const expected = [ { a : 1 }, { a : 1 }, { a : 2 }, { a : 3 } ]
const result = sortBy(x => x.a)(input)
expect(result).toEqual(expected)
})
test('with compose', () => {
const alice = {
name : 'ALICE',
age : 101,
}
const bob = {
name : 'Bob',
age : -10,
}
const clara = {
name : 'clara',
age : 314.159,
}
const people = [ clara, bob, alice ]
const sortByNameCaseInsensitive = sortBy(compose(toLower, prop('name')))
expect(sortByNameCaseInsensitive(people)).toEqual([ alice, bob, clara ])
})
import {sortBy} from 'rambda'
describe('sortBy', () => {
it('happy', () => {
interface Input {
a: number,
}
function fn(x: Input): number {
return x.a
}
const input: Input[] = [{a: 2}, {a: 1}, {a: 0}]
const result = sortBy(fn, input)
result // $ExpectType Input[]
result[0].a // $ExpectType number
})
})
Reason for the failure: ramda works with array-like objects
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
var albums = [
{title: 'Art of the Fugue', artist: 'Glenn Gould', genre: 'Baroque'},
{title: 'A Farewell to Kings', artist: 'Rush', genre: 'Rock'},
{title: 'Timeout', artist: 'Dave Brubeck Quartet', genre: 'Jazz'},
{title: 'Fly By Night', artist: 'Rush', genre: 'Rock'},
{title: 'Goldberg Variations', artist: 'Daniel Barenboim', genre: 'Baroque'},
{title: 'New World Symphony', artist: 'Leonard Bernstein', genre: 'Romantic'},
{title: 'Romance with the Unseen', artist: 'Don Byron', genre: 'Jazz'},
{title: 'Somewhere In Time', artist: 'Iron Maiden', genre: 'Metal'},
{title: 'In Times of Desparation', artist: 'Danny Holt', genre: 'Modern'},
{title: 'Evita', artist: 'Various', genre: 'Broadway'},
{title: 'Five Leaves Left', artist: 'Nick Drake', genre: 'Folk'},
{title: 'The Magic Flute', artist: 'John Eliot Gardiner', genre: 'Classical'}
];
describe('sortBy', function() {
it('sorts array-like object', function() {
var args = (function() { return arguments; }('c', 'a', 'b'));
var result = R.sortBy(R.identity, args);
eq(result[0], 'a');
eq(result[1], 'b');
eq(result[2], 'c');
});
});
split(separator: string | RegExp): (str: string) => string[]
Curried version of String.prototype.split
const str = 'foo|bar|baz'
const separator = |'
const result = R.split(separator, str))
// => [ 'foo', 'bar', 'baz' ]
Try the above R.split example in Rambda REPL
split(separator: string | RegExp): (str: string) => string[];
split(separator: string | RegExp, str: string): string[];
export function split(separator, str){
if (arguments.length === 1) return _str => split(separator, _str)
return str.split(separator)
}
import { split } from './split'
test('split', () => {
expect(split('|')('foo|bar|baz')).toEqual([ 'foo', 'bar', 'baz' ])
expect(split('.', 'a.b.c.xyz.d')).toEqual([ 'a', 'b', 'c', 'xyz', 'd' ])
})
splitEvery<T>(sliceLength: number, listOrString: ReadonlyArray<T>): T[][]
It splits listOrString into slices of sliceLength.
const result = [
R.splitEvery(2, [1, 2, 3]),
R.splitEvery(3, 'foobar')
]
const expected = [
[[1, 2], [3]],
['foo', 'bar']
]
// => `result` is equal to `expected`
Try the above R.splitEvery example in Rambda REPL
splitEvery<T>(sliceLength: number, listOrString: ReadonlyArray<T>): T[][];
splitEvery(sliceLength: number, listOrString: string): string[];
splitEvery(sliceLength: number): {
(listOrString: string): string[];
<T>(listOrString: ReadonlyArray<T>): T[][];
};
export function splitEvery(sliceLength, listOrString){
if (arguments.length === 1){
return _listOrString => splitEvery(sliceLength, _listOrString)
}
if (sliceLength < 1){
throw new Error('First argument to splitEvery must be a positive integer')
}
const willReturn = []
let counter = 0
while (counter < listOrString.length){
willReturn.push(listOrString.slice(counter, counter += sliceLength))
}
return willReturn
}
import { splitEvery } from './splitEvery'
test('happy', () => {
expect(splitEvery(3, [ 1, 2, 3, 4, 5, 6, 7 ])).toEqual([
[ 1, 2, 3 ],
[ 4, 5, 6 ],
[ 7 ],
])
expect(splitEvery(3)('foobarbaz')).toEqual([ 'foo', 'bar', 'baz' ])
})
test('with bad input', () => {
expect(() =>
expect(splitEvery(0)('foo')).toEqual([ 'f', 'o', 'o' ])).toThrow('First argument to splitEvery must be a positive integer')
})
startsWith(target: string, str: string): boolean
Curried version of String.prototype.startsWith
const str = 'foo-bar'
const result = [
R.startsWith('foo', str),
R.startsWith('bar', str)
]
// => [true, false]
Try the above R.startsWith example in Rambda REPL
startsWith(target: string, str: string): boolean;
startsWith(target: string): (str: string) => boolean;
export function startsWith(target, str){
if (arguments.length === 1) return _str => startsWith(target, _str)
return str.startsWith(target)
}
import { startsWith } from './startsWith'
test('true', () => {
const result = startsWith('foo', 'foo-bar')
expect(result).toBeTrue()
})
test('false', () => {
const result = startsWith('baz')('foo-bar')
expect(result).toBeFalse()
})
Reason for the failure: rambda doesn't support arrays
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('startsWith', function() {
it('should return true when an array starts with the provided value', function() {
eq(R.startsWith(['a'], ['a', 'b', 'c']), true);
});
it('should return true when an array starts with the provided values', function() {
eq(R.startsWith(['a', 'b'], ['a', 'b', 'c']), true);
});
it('should return false when an array does not start with the provided value', function() {
eq(R.startsWith(['b'], ['a', 'b', 'c']), false);
});
it('should return false when an array does not start with the provided values', function() {
eq(R.startsWith(['b', 'c'], ['a', 'b', 'c']), false);
});
});
subtract(x: number, y: number): number
Curried version of x - y
const x = 3
const y = 1
R.subtract(x, y)
// => 2
Try the above R.subtract example in Rambda REPL
subtract(x: number, y: number): number;
subtract(x: number): (y: number) => number;
export function subtract(a, b){
if (arguments.length === 1) return _b => subtract(a, _b)
return a - b
}
import { subtract } from './subtract'
test('happy', () => {
expect(subtract(2, 1)).toEqual(1)
expect(subtract(2)(1)).toEqual(1)
})
sum(list: ReadonlyArray<number>): number
R.sum([1, 2, 3, 4, 5])
// => 15
Try the above R.sum example in Rambda REPL
sum(list: ReadonlyArray<number>): number;
export function sum(list){
return list.reduce((prev, current) => prev + current, 0)
}
import { sum } from './sum'
test('happy', () => {
expect(sum([ 1, 2, 3, 4, 5 ])).toBe(15)
})
symmetricDifference<T>(x: ReadonlyArray<T>, y: ReadonlyArray<T>): T[]
It returns a merged list of x and y with all equal elements removed.
const x = [ 1, 2, 3, 4 ]
const y = [ 3, 4, 5, 6 ]
const result = symmetricDifference(x, y)
// => [ 1, 2, 5, 6 ]
Try the above R.symmetricDifference example in Rambda REPL
symmetricDifference<T>(x: ReadonlyArray<T>, y: ReadonlyArray<T>): T[];
symmetricDifference<T>(x: ReadonlyArray<T>): <T>(y: ReadonlyArray<T>) => T[];
import { concat } from './concat'
import { filter } from './filter'
import { includes } from './includes'
export function symmetricDifference(x, y){
if (arguments.length === 1){
return _y => symmetricDifference(x, _y)
}
return concat(filter(value => !includes(value, y), x),
filter(value => !includes(value, x), y))
}
import { symmetricDifference } from './symmetricDifference'
test('symmetricDifference', () => {
const list1 = [ 1, 2, 3, 4 ]
const list2 = [ 3, 4, 5, 6 ]
expect(symmetricDifference(list1)(list2)).toEqual([ 1, 2, 5, 6 ])
expect(symmetricDifference([], [])).toEqual([])
})
test('symmetricDifference with objects', () => {
const list1 = [ { id : 1 }, { id : 2 }, { id : 3 }, { id : 4 } ]
const list2 = [ { id : 3 }, { id : 4 }, { id : 5 }, { id : 6 } ]
expect(symmetricDifference(list1)(list2)).toEqual([
{ id : 1 },
{ id : 2 },
{ id : 5 },
{ id : 6 },
])
})
T(): boolean
R.T()
// => true
Try the above R.T example in Rambda REPL
T(): boolean;
export function T(){
return true
}
tail<T>(listOrString: ReadonlyArray<T>): T[]
It returns all but the first element of listOrString.
const result = [
R.tail([1, 2, 3]),
R.tail('foo')
]
// => [[2, 3], 'oo']
Try the above R.tail example in Rambda REPL
tail<T>(listOrString: ReadonlyArray<T>): T[];
tail(listOrString: string): string;
import { drop } from './drop'
export function tail(listOrString){
return drop(1, listOrString)
}
import { tail } from './tail'
test('tail', () => {
expect(tail([ 1, 2, 3 ])).toEqual([ 2, 3 ])
expect(tail([ 1, 2 ])).toEqual([ 2 ])
expect(tail([ 1 ])).toEqual([])
expect(tail([])).toEqual([])
expect(tail('abc')).toEqual('bc')
expect(tail('ab')).toEqual('b')
expect(tail('a')).toEqual('')
expect(tail('')).toEqual('')
})
take<T>(howMany: number, listOrString: ReadonlyArray<T>): T[]
It returns the first howMany elements of listOrString.
const howMany = 2
const result = [
R.take(howMany, [1, 2, 3]),
R.take(howMany, 'foobar'),
]
// => [[1, 2], 'fo']
Try the above R.take example in Rambda REPL
take<T>(howMany: number, listOrString: ReadonlyArray<T>): T[];
take(howMany: number, listOrString: string): string;
take<T>(howMany: number): {
(listOrString: string): string;
(listOrString: ReadonlyArray<T>): T[];
};
import baseSlice from './_internals/baseSlice'
export function take(howMany, listOrString){
if (arguments.length === 1)
return _listOrString => take(howMany, _listOrString)
if (howMany < 0) return listOrString.slice()
if (typeof listOrString === 'string') return listOrString.slice(0, howMany)
return baseSlice(
listOrString, 0, howMany
)
}
import { take } from './take'
test('happy', () => {
const arr = [ 'foo', 'bar', 'baz' ]
expect(take(1, arr)).toEqual([ 'foo' ])
expect(arr).toEqual([ 'foo', 'bar', 'baz' ])
expect(take(2)([ 'foo', 'bar', 'baz' ])).toEqual([ 'foo', 'bar' ])
expect(take(3, [ 'foo', 'bar', 'baz' ])).toEqual([ 'foo', 'bar', 'baz' ])
expect(take(4, [ 'foo', 'bar', 'baz' ])).toEqual([ 'foo', 'bar', 'baz' ])
expect(take(3)('rambda')).toEqual('ram')
})
test('with negative index', () => {
expect(take(-1, [ 1, 2, 3 ])).toEqual([ 1, 2, 3 ])
expect(take(-Infinity, [ 1, 2, 3 ])).toEqual([ 1, 2, 3 ])
})
test('with zero index', () => {
expect(take(0, [ 1, 2, 3 ])).toEqual([])
})
Reason for the failure: rambda doesn't have 'R.into` method
var assert = require('assert');
var sinon = require('sinon');
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('take', function() {
it('handles zero correctly (#1224)', function() {
eq(R.into([], R.take(0), [1, 2, 3]), []);
});
it('steps correct number of times', function() {
var spy = sinon.spy();
R.into([], R.compose(R.map(spy), R.take(2)), [1, 2, 3]);
sinon.assert.calledTwice(spy);
});
it('transducer called for every member of list if `n` is < 0', function() {
var spy = sinon.spy();
R.into([], R.compose(R.map(spy), R.take(-1)), [1, 2, 3]);
sinon.assert.calledThrice(spy);
});
});
takeLast<T>(howMany: number, listOrString: ReadonlyArray<T>): T[]
It returns the last howMany elements of listOrString.
const howMany = 2
const result = [
R.takeLast(howMany, [1, 2, 3]),
R.takeLast(howMany, 'foobar'),
]
// => [[2, 3], 'ar']
Try the above R.takeLast example in Rambda REPL
takeLast<T>(howMany: number, listOrString: ReadonlyArray<T>): T[];
takeLast(howMany: number, listOrString: string): string;
takeLast<T>(howMany: number): {
(listOrString: string): string;
(listOrString: ReadonlyArray<T>): T[];
};
import baseSlice from './_internals/baseSlice'
export function takeLast(howMany, listOrString){
if (arguments.length === 1)
return _listOrString => takeLast(howMany, _listOrString)
const len = listOrString.length
if (howMany < 0) return listOrString.slice()
let numValue = howMany > len ? len : howMany
if (typeof listOrString === 'string')
return listOrString.slice(len - numValue)
numValue = len - numValue
return baseSlice(
listOrString, numValue, len
)
}
import { takeLast } from './takeLast'
test('with arrays', () => {
expect(takeLast(1, [ 'foo', 'bar', 'baz' ])).toEqual([ 'baz' ])
expect(takeLast(2)([ 'foo', 'bar', 'baz' ])).toEqual([ 'bar', 'baz' ])
expect(takeLast(3, [ 'foo', 'bar', 'baz' ])).toEqual([ 'foo', 'bar', 'baz' ])
expect(takeLast(4, [ 'foo', 'bar', 'baz' ])).toEqual([ 'foo', 'bar', 'baz' ])
expect(takeLast(10, [ 'foo', 'bar', 'baz' ])).toEqual([ 'foo', 'bar', 'baz' ])
})
test('with strings', () => {
expect(takeLast(3, 'rambda')).toEqual('bda')
expect(takeLast(7, 'rambda')).toEqual('rambda')
})
test('with negative index', () => {
expect(takeLast(-1, [ 1, 2, 3 ])).toEqual([ 1, 2, 3 ])
expect(takeLast(-Infinity, [ 1, 2, 3 ])).toEqual([ 1, 2, 3 ])
})
tap<T>(fn: (a: T) => any, x: T): T
It applies function fn to input x and returns x.
One use case is debuging in the middle of R.compose.
const list = [1, 2, 3]
R.compose(
R.map(x => x * 2)
R.tap(console.log),
R.filter(x => x > 1)
)(list)
// => `2` and `3` will be logged
Try the above R.tap example in Rambda REPL
tap<T>(fn: (a: T) => any, x: T): T;
tap<T>(fn: (a: T) => any): (x: T) => T;
export function tap(fn, x){
if (arguments.length === 1) return _x => tap(fn, _x)
fn(x)
return x
}
import { tap } from './tap'
test('tap', () => {
let a = 1
const sayX = x => a = x
expect(tap(sayX, 100)).toEqual(100)
expect(tap(sayX)(100)).toEqual(100)
expect(a).toEqual(100)
})
Reason for the failure: ramda can act as a transducer
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
var listXf = require('./helpers/listXf');
var _curry2 = require('rambda/internal/_curry2');
describe('tap', function() {
var pushToList = _curry2(function(lst, x) { lst.push(x); });
it('can act as a transducer', function() {
var sideEffect = [];
var numbers = [1,2,3,4,5];
var xf = R.compose(R.map(R.identity), R.tap(pushToList(sideEffect)));
eq(R.into([], xf, numbers), numbers);
eq(sideEffect, numbers);
});
it('dispatches to transformer objects', function() {
var sideEffect = [];
var pushToSideEffect = pushToList(sideEffect);
eq(R.tap(pushToSideEffect, listXf), {
f: pushToSideEffect,
xf: listXf
});
});
});
test(regExpression: RegExp): (str: string) => boolean
It determines whether str matches regExpression.
R.test(/^f/, 'foo')
// => true
Try the above R.test example in Rambda REPL
test(regExpression: RegExp): (str: string) => boolean;
test(regExpression: RegExp, str: string): boolean;
export function test(pattern, str){
if (arguments.length === 1) return _str => test(pattern, _str)
if (typeof pattern === 'string'){
throw new TypeError(`‘test’ requires a value of type RegExp as its first argument; received "${ pattern }"`)
}
return str.search(pattern) !== -1
}
import { test as testMethod } from './test'
test('happy', () => {
expect(testMethod(/^x/, 'xyz')).toBeTrue()
expect(testMethod(/^y/)('xyz')).toBeFalse()
})
test('throws if first argument is not regex', () => {
expect(() => testMethod('foo', 'bar')).toThrow('‘test’ requires a value of type RegExp as its first argument; received "foo"')
})
times<T>(fn: (i: number) => T, howMany: number): T[]
It returns the result of applying function fn over members of range array.
The range array includes numbers between 0 and howMany(exclusive).
const fn = x => x * 2
const howMany = 5
R.times(fn, howMany)
//=> [0, 2, 4, 6, 8]
Try the above R.times example in Rambda REPL
times<T>(fn: (i: number) => T, howMany: number): T[];
times<T>(fn: (i: number) => T): (howMany: number) => T[];
import { map } from './map'
import { range } from './range'
export function times(fn, howMany){
if (arguments.length === 1) return _howMany => times(fn, _howMany)
if (!Number.isInteger(howMany) || howMany < 0){
throw new RangeError('n must be an integer')
}
return map(fn, range(0, howMany))
}
import assert from 'assert'
import { identity } from './identity'
import { times } from './times'
test('happy', () => {
const result = times(identity, 5)
expect(result).toEqual([ 0, 1, 2, 3, 4 ])
})
test('with bad input', () => {
assert.throws(() => {
times(3)('cheers!')
}, RangeError)
assert.throws(() => {
times(identity, -1)
}, RangeError)
})
test('curry', () => {
const result = times(identity)(5)
expect(result).toEqual([ 0, 1, 2, 3, 4 ])
})
toLower(str: string): string
R.toLower('FOO')
// => 'foo'
Try the above R.toLower example in Rambda REPL
toLower(str: string): string;
export function toLower(str){
return str.toLowerCase()
}
import { toLower } from './toLower'
test('toLower', () => {
expect(toLower('FOO|BAR|BAZ')).toEqual('foo|bar|baz')
})
toPairs<S>(obj: { [k: string]: S } | { [k: number]: S }): [string, S][]
It transforms an object to a list.
const list = {
a : 1,
b : 2,
c : [ 3, 4 ],
}
const expected = [ [ 'a', 1 ], [ 'b', 2 ], [ 'c', [ 3, 4 ] ] ]
const result = R.toPairs(list)
// => `result` is equal to `expected`
Try the above R.toPairs example in Rambda REPL
toPairs<S>(obj: { [k: string]: S } | { [k: number]: S }): [string, S][];
export function toPairs(obj){
return Object.entries(obj)
}
import { toPairs } from './toPairs'
const obj = {
a : 1,
b : 2,
c : [ 3, 4 ],
}
const expected = [
[ 'a', 1 ],
[ 'b', 2 ],
[ 'c', [ 3, 4 ] ],
]
test('happy', () => {
expect(toPairs(obj)).toEqual(expected)
})
toString<T>(x: T): string
R.toString([1, 2])
// => '1,2'
Try the above R.toString example in Rambda REPL
toString<T>(x: T): string;
export function toString(val){
return val.toString()
}
import { toString } from './toString'
test('happy', () => {
expect(toString([ 1, 2, 3 ])).toEqual('1,2,3')
})
toUpper(str: string): string
R.toUpper('foo')
// => 'FOO'
Try the above R.toUpper example in Rambda REPL
toUpper(str: string): string;
export function toUpper(str){
return str.toUpperCase()
}
import { toUpper } from './toUpper'
test('toUpper', () => {
expect(toUpper('foo|bar|baz')).toEqual('FOO|BAR|BAZ')
})
transpose<T>(list: T[][]): T[][]
const list = [[10, 11], [20], [], [30, 31, 32]]
const expected = [[10, 20, 30], [11, 31], [32]]
const result = R.transpose(list)
// => `result` is equal to `expected`
Try the above R.transpose example in Rambda REPL
transpose<T>(list: T[][]): T[][];
export function transpose(array){
return array.reduce((acc, el) => {
el.forEach((nestedEl, i) =>
Array.isArray(acc[ i ]) ? acc[ i ].push(nestedEl) : acc.push([ nestedEl ]))
return acc
}, [])
}
import { transpose } from './transpose'
test('happy', () => {
const input = [
[ 'a', 1 ],
[ 'b', 2 ],
[ 'c', 3 ],
]
expect(transpose(input)).toEqual([
[ 'a', 'b', 'c' ],
[ 1, 2, 3 ],
])
})
test('when rows are shorter', () => {
const actual = transpose([ [ 10, 11 ], [ 20 ], [], [ 30, 31, 32 ] ])
const expected = [ [ 10, 20, 30 ], [ 11, 31 ], [ 32 ] ]
expect(actual).toEqual(expected)
})
test('with empty array', () => {
expect(transpose([])).toEqual([])
})
test('array with falsy values', () => {
const actual = transpose([
[ true, false, undefined, null ],
[ null, undefined, false, true ],
])
const expected = [
[ true, null ],
[ false, undefined ],
[ undefined, false ],
[ null, true ],
]
expect(actual).toEqual(expected)
})
trim(str: string): string
R.trim(' foo ')
// => 'foo'
Try the above R.trim example in Rambda REPL
trim(str: string): string;
export function trim(str){
return str.trim()
}
import { trim } from './trim'
test('trim', () => {
expect(trim(' foo ')).toEqual('foo')
})
Reason for the failure: ramda trims all ES5 whitespace
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('trim', function() {
var test = '\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFFHello, World!\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF';
it('trims all ES5 whitespace', function() {
eq(R.trim(test), 'Hello, World!');
eq(R.trim(test).length, 13);
});
if (typeof String.prototype.trim !== 'function') {
it('falls back to a shim if String.prototype.trim is not present', function() {
eq(R.trim(' xyz '), 'xyz');
eq(R.trim(test), 'Hello, World!');
eq(R.trim(test).length, 13);
eq(R.trim('\u200b'), '\u200b');
eq(R.trim('\u200b').length, 1);
});
}
});
type(x: any): "Object" | "Number" | "Boolean" | "String" | "Null" | "Array" | "Function" | "Undefined" | "Async" | "Promise" | "RegExp" | "NaN"
It accepts any input and it returns its type.
R.type(() => {}) // => 'Function'
R.type(async () => {}) // => 'Async'
R.type([]) // => 'Array'
R.type({}) // => 'Object'
R.type('foo') // => 'String'
R.type(1) // => 'Number'
R.type(true) // => 'Boolean'
R.type(null) // => 'Null'
R.type(/[A-z]/) // => 'RegExp'
R.type('foo'*1) // => 'NaN'
const delay = ms => new Promise(resolve => {
setTimeout(function () {
resolve()
}, ms)
})
R.type(delay) // => 'Promise'
Try the above R.type example in Rambda REPL
type(x: any): "Object" | "Number" | "Boolean" | "String" | "Null" | "Array" | "Function" | "Undefined" | "Async" | "Promise" | "RegExp" | "NaN";
export function type(input){
const typeOf = typeof input
if (input === null){
return 'Null'
} else if (input === undefined){
return 'Undefined'
} else if (typeOf === 'boolean'){
return 'Boolean'
} else if (typeOf === 'number'){
return Number.isNaN(input) ? 'NaN' : 'Number'
} else if (typeOf === 'string'){
return 'String'
} else if (Array.isArray(input)){
return 'Array'
} else if (input instanceof RegExp){
return 'RegExp'
}
const asStr = input && input.toString ? input.toString() : ''
if ([ 'true', 'false' ].includes(asStr)) return 'Boolean'
if (!Number.isNaN(Number(asStr))) return 'Number'
if (asStr.startsWith('async')) return 'Async'
if (asStr === '[object Promise]') return 'Promise'
if (typeOf === 'function') return 'Function'
if (input instanceof String) return 'String'
return 'Object'
}
import { type as ramdaType } from 'ramda'
import { type } from './type'
test('with simple promise', () => {
expect(type(Promise.resolve(1))).toBe('Promise')
})
test('with new Boolean', () => {
expect(type(new Boolean(true))).toBe('Boolean')
})
test('with new String', () => {
expect(type(new String('I am a String object'))).toEqual('String')
})
test('with new Number', () => {
expect(type(new Number(1))).toBe('Number')
})
test('with new promise', () => {
const delay = ms =>
new Promise(resolve => {
setTimeout(() => {
resolve(ms + 110)
}, ms)
})
expect(type(delay(10))).toEqual('Promise')
})
test('async function', () => {
expect(type(async () => {})).toEqual('Async')
})
test('async arrow', () => {
const asyncArrow = async () => {}
expect(type(asyncArrow)).toBe('Async')
})
test('function', () => {
const fn1 = () => {}
const fn2 = function (){}
function fn3(){}
;[ () => {}, fn1, fn2, fn3 ].map(val => {
expect(type(val)).toEqual('Function')
})
})
test('object', () => {
expect(type({})).toEqual('Object')
})
test('number', () => {
expect(type(1)).toEqual('Number')
})
test('boolean', () => {
expect(type(false)).toEqual('Boolean')
})
test('string', () => {
expect(type('foo')).toEqual('String')
})
test('null', () => {
expect(type(null)).toEqual('Null')
})
test('array', () => {
expect(type([])).toEqual('Array')
expect(type([ 1, 2, 3 ])).toEqual('Array')
})
test('regex', () => {
expect(type(/\s/g)).toEqual('RegExp')
})
test('undefined', () => {
expect(type(undefined)).toEqual('Undefined')
})
test('not a number', () => {
expect(type(Number('s'))).toBe('NaN')
})
test('function inside object 1', () => {
const obj = {
f(){
return 4
},
}
expect(type(obj.f)).toBe('Function')
expect(ramdaType(obj.f)).toBe('Function')
})
test('function inside object 2', () => {
const name = 'f'
const obj = {
[ name ](){
return 4
},
}
expect(type(obj.f)).toBe('Function')
expect(ramdaType(obj.f)).toBe('Function')
})
Reason for the failure: ramda returns 'Number' type to NaN input, while rambda returns 'NaN'
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('type', function() {
// it('"Arguments" if given an arguments object', function() {
// var args = (function() { return arguments; }());
// eq(R.type(args), 'Arguments');
// });
it('"Number" if given the NaN value', function() {
eq(R.type(NaN), 'Number');
});
});
uniq<T>(list: ReadonlyArray<T>): T[]
It returns a new array containing only one copy of each element of list.
const list = [1, 1, {a: 1}, {a: 2}, {a:1}]
R.uniq(list)
// => [1, {a: 1}, {a: 2}]
Try the above R.uniq example in Rambda REPL
uniq<T>(list: ReadonlyArray<T>): T[];
import { includes } from './includes'
export function uniq(list){
let index = -1
const willReturn = []
while (++index < list.length){
const value = list[ index ]
if (!includes(value, willReturn)){
willReturn.push(value)
}
}
return willReturn
}
import { uniq } from './uniq'
test('uniq', () => {
expect(uniq([ 1, 2, 3, 3, 3, 1, 2, 0 ])).toEqual([ 1, 2, 3, 0 ])
expect(uniq([ 1, 1, 2, 1 ])).toEqual([ 1, 2 ])
expect([ 1, '1' ]).toEqual([ 1, '1' ])
expect(uniq([ [ 42 ], [ 42 ] ])).toEqual([ [ 42 ] ])
})
import {uniq} from 'rambda'
describe('uniq', () => {
it('happy', () => {
const result = uniq([1, 2, 3, 3, 3, 1, 2, 0])
result // $ExpectType number[]
})
})
Reason for the failure: ramda pass to
uniqmethod | ramda method uses reference equality for functions
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('uniq', function() {
it('has R.equals semantics', function() {
function Just(x) { this.value = x; }
Just.prototype.equals = function(x) {
return x instanceof Just && R.equals(x.value, this.value);
};
eq(R.uniq([-0, -0]).length, 1);
eq(R.uniq([0, -0]).length, 2);
eq(R.uniq([NaN, NaN]).length, 1);
eq(R.uniq([[1], [1]]).length, 1);
eq(R.uniq([new Just([42]), new Just([42])]).length, 1);
it('handles null and undefined elements', function() {
eq(R.uniq([void 0, null, void 0, null]), [void 0, null]);
it('uses reference equality for functions', function() {
eq(R.uniq([R.add, R.identity, R.add, R.identity, R.add, R.identity]).length, 2);
});
uniqWith<T, U>(uniqFn: (x: T, y: T) => boolean, list: ReadonlyArray<T>): T[]
It returns a new array containing only one copy of each element in list according to boolean returning function uniqFn.
const list = [
{id: 0, title:'foo'},
{id: 1, title:'bar'},
{id: 2, title:'baz'},
{id: 3, title:'foo'},
{id: 4, title:'bar'},
]
const expected = [
{id: 0, title:'foo'},
{id: 1, title:'bar'},
{id: 2, title:'baz'},
]
const uniqFn = (x,y) => x.title === y.title
const result = R.uniqWith(uniqFn, list)
// => `result` is equal to `expected`
Try the above R.uniqWith example in Rambda REPL
uniqWith<T, U>(uniqFn: (x: T, y: T) => boolean, list: ReadonlyArray<T>): T[];
uniqWith<T, U>(uniqFn: (x: T, y: T) => boolean): (list: ReadonlyArray<T>) => T[];
import { any } from './any'
export function uniqWith(fn, list){
if (arguments.length === 1) return _list => uniqWith(fn, _list)
let index = -1
const len = list.length
const willReturn = []
while (++index < len){
const value = list[ index ]
const flag = any(willReturnInstance => fn(value, willReturnInstance),
willReturn)
if (!flag){
willReturn.push(value)
}
}
return willReturn
}
import { uniqWith } from './uniqWith'
test('happy', () => {
const input = [
{
id : 0,
title : 'foo',
},
{
id : 1,
title : 'bar',
},
{
id : 2,
title : 'baz',
},
{
id : 3,
title : 'foo',
},
{
id : 4,
title : 'bar',
},
]
const expectedResult = [
{
id : 0,
title : 'foo',
},
{
id : 1,
title : 'bar',
},
{
id : 2,
title : 'baz',
},
]
const fn = (x, y) => x.title === y.title
const result = uniqWith(fn, input)
const curriedResult = uniqWith(fn)(input)
expect(result).toEqual(expectedResult)
expect(curriedResult).toEqual(expectedResult)
})
test('uniqWith', () => {
const input = [
{
id : 0,
title : 'foo',
},
{
id : 1,
title : 'bar',
},
{
id : 2,
title : 'baz',
},
{
id : 3,
title : 'foo',
},
{
id : 4,
title : 'bar',
},
]
const expectedResult = [
{
id : 0,
title : 'foo',
},
{
id : 1,
title : 'bar',
},
{
id : 2,
title : 'baz',
},
]
const fn = (x, y) => x.title === y.title
const result = uniqWith(fn, input)
//const result = uniqWith(Ramda.eqBy(Ramda.prop('title')), input)
expect(result).toEqual(expectedResult)
})
import {uniqWith} from 'rambda'
describe('uniqWith', () => {
it('happy', () => {
const input = [
{
id: 0,
title: 'foo',
},
{
id: 1,
title: 'bar',
},
{
id: 2,
title: 'baz',
},
{
id: 3,
title: 'foo',
},
{
id: 4,
title: 'bar',
},
]
const fn = (x: any, y: any) => x.title === y.title
const result = uniqWith(fn, input)
result // $ExpectType { id: number; title: string; }[]
})
})
update<T>(index: number, newValue: T, list: ReadonlyArray<T>): T[]
It returns a copy of list with updated element at index with newValue.
const index = 2
const newValue = 88
const list = [1, 2, 3, 4, 5]
const result = update(index, newValue, list)
// => [1, 2, 88, 4, 5]
Try the above R.update example in Rambda REPL
update<T>(index: number, newValue: T, list: ReadonlyArray<T>): T[];
update<T>(index: number, newValue: T): (list: ReadonlyArray<T>) => T[];
export function update(
idx, val, list
){
if (val === undefined){
return (_val, _list) => update(
idx, _val, _list
)
} else if (list === undefined){
return _list => update(
idx, val, _list
)
}
const arrClone = list.slice()
return arrClone.fill(
val, idx, idx + 1
)
}
import { update } from './update'
test('update', () => {
expect(update(1)(0)([ 1, 2, 3 ])).toEqual([ 1, 0, 3 ])
expect(update(
1, 11, [ 0, 1, 2 ]
)).toEqual([ 0, 11, 2 ])
})
import {update} from 'rambda'
describe('update', () => {
it('happy', () => {
const result = update(1, 0, [1, 2, 3])
result // $ExpectType number[]
})
})
Reason for the failure: ramda accepts an array-like object
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('update', function() {
it('accepts an array-like object', function() {
function args() {
return arguments;
}
eq(R.update(2, 4, args(0, 1, 2, 3)), [0, 1, 4, 3]);
});
});
values<T extends object, K extends keyof T>(obj: T): T[K][]
With correct input, this is nothing more than Object.values(obj). If obj is not an object, then it returns an empty array.
const obj = {a:1, b:2}
R.values(obj)
// => [1, 2]
Try the above R.values example in Rambda REPL
values<T extends object, K extends keyof T>(obj: T): T[K][];
import { type } from './type.js'
export function values(obj){
if (type(obj) !== 'Object') return []
return Object.values(obj)
}
import { values } from './values'
test('happy', () => {
expect(values({
a : 1,
b : 2,
c : 3,
})).toEqual([ 1, 2, 3 ])
})
test('with bad input', () => {
expect(values(null)).toEqual([])
expect(values(undefined)).toEqual([])
expect(values(55)).toEqual([])
expect(values('foo')).toEqual([])
expect(values(true)).toEqual([])
expect(values(false)).toEqual([])
expect(values(NaN)).toEqual([])
expect(values(Infinity)).toEqual([])
expect(values([])).toEqual([])
})
import {values} from 'rambda'
describe('values', () => {
it('happy', () => {
const result = values({
a: 1,
b: 2,
c: 3,
})
result // $ExpectType number[]
})
})
view<T, U>(lens: Lens): (target: T) => U
It returns the value of lens focus over target object.
const lens = R.lensProp('x')
R.view(lens, {x: 1, y: 2}) //=> 1
R.view(lens, {x: 4, y: 2}) //=> 4
Try the above R.view example in Rambda REPL
view<T, U>(lens: Lens): (target: T) => U;
view<T, U>(lens: Lens, target: T): U;
const Const = x => ({
x,
map : fn => Const(x),
})
export function view(lens, target){
if (arguments.length === 1) return _target => view(lens, _target)
return lens(Const)(target).x
}
when<T>(
rule: Func<boolean>, resultOrFunction: T | IdentityFunction<T>
): IdentityFunction<T>
It accepts `rule` and `resultOrFunction` as arguments and returns a function with `input`.
This function will return `input` if `rule(input)` is false.
If `resultOrFunction` is function, it will return `resultOrFunction(input)`.
If `resultOrFunction` is not function, it will return `resultOrFunction`.
Maybe the example use will do a better job in explaining this method.
const rule = x => typeof x === 'number'
const whenTrueResult = 6345789
const whenTrueFn = R.add(11)
const fnWithResult = when(rule, whenTrueResult)
const fnWithFunction = when(rule, whenTrueFn)
const goodInput = 88
const badInput = 'foo'
const result = [
fnWithResult(goodInput),
fnWithResult(badInput),
fnWithFn(goodInput)
fnWithFn(badInput),
]
const expected = [
6345789,
'foo',
99,
'foo'
]
// => `result` is equal to `expected`
Try the above R.when example in Rambda REPL
when<T>(
rule: Func<boolean>, resultOrFunction: T | IdentityFunction<T>
): IdentityFunction<T>;
when<T>(
rule: Func<boolean>
): (resultOrFunction: T | IdentityFunction<T>) => IdentityFunction<T>;
import { isFunction } from './isFunction'
export function when(rule, resultOrFunction){
if (arguments.length === 1){
return whenTrueHolder => when(rule, whenTrueHolder)
}
return input => {
if (!rule(input)) return input
return isFunction(resultOrFunction) ?
resultOrFunction(input) :
resultOrFunction
}
}
import { add } from './add'
import { is } from './is'
import { when } from './when'
const ruleResult = 'RULE_RESULT'
const rule = x => typeof x === 'number'
const fn = when(rule, ruleResult)
const curriedFn = when(rule)(ruleResult)
test('when rule returns true', () => {
const input = 7
expect(fn(input)).toBe(ruleResult)
})
test('when rule returns false', () => {
const input = 'foo'
expect(fn(input)).toBe(input)
expect(curriedFn(input)).toBe(input)
})
test('second argument can be a function', () => {
const fn = when(is(Number), add(1))
expect(fn(10)).toBe(11)
})
import {when, add} from 'rambda'
const ruleResult = 88
const rule = (x: number) => x > 2
describe('when', () => {
it('without passing type - happy', () => {
const fn = when(rule, ruleResult)
const result = [
fn(1),
fn(2)
]
result[0] // $ExpectType number
result[1] // $ExpectType number
})
it('without passing type - second argument is function', () => {
const fn = when(rule, add(1))
const fnCurried = when(rule)(add(1))
const [result1, result2] = [
fn(1),
fnCurried(2),
]
result1 // $ExpectType number
result2 // $ExpectType unknown
})
it('with passing type', () => {
const fn = when<number>(rule, ruleResult)
const result = fn(1)
result // $ExpectType number
})
it('with passing type - second argument is function', () => {
const fn = when<number>(rule, add(1))
const fnCurried = when<number>(rule)(add(1))
const [result1, result2] = [
fn(1),
fnCurried(2),
]
result1 // $ExpectType number
result2 // $ExpectType number
})
it('curry', () => {
const fn = when<number>(rule)(ruleResult)
const result = fn(1)
result // $ExpectType number
})
})
without<T>(matchAgainst: ReadonlyArray<T>, source: ReadonlyArray<T>): T[]
It will return a new array, based on all members of source list that are not part of matchAgainst list.
const source = [1, 2, 3, 4]
const matchAgainst = [2, 3]
const result = R.without(matchAgainst, source)
// => [1, 4]
Try the above R.without example in Rambda REPL
without<T>(matchAgainst: ReadonlyArray<T>, source: ReadonlyArray<T>): T[];
without<T>(matchAgainst: ReadonlyArray<T>): (source: ReadonlyArray<T>) => T[];
import { includes } from './includes'
import { reduce } from './reduce'
export function without(matchAgainst, source){
if (source === undefined){
return _source => without(matchAgainst, _source)
}
return reduce(
(prev, current) =>
includes(current, matchAgainst) ? prev : prev.concat(current),
[],
source
)
}
import { without } from './without'
test('should return a new list without values in the first argument ', () => {
const itemsToOmit = [ 'A', 'B', 'C' ]
const collection = [ 'A', 'B', 'C', 'D', 'E', 'F' ]
expect(without(itemsToOmit, collection)).toEqual([ 'D', 'E', 'F' ])
expect(without(itemsToOmit)(collection)).toEqual([ 'D', 'E', 'F' ])
})
test('ramda test', () => {
expect(without([ 1, 2 ])([ 1, 2, 1, 3, 4 ])).toEqual([ 3, 4 ])
})
Reason for the failure: ramda method act as a transducer | ramda method pass to
equalsmethod
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('without', function() {
it('can act as a transducer', function() {
eq(R.into([], R.without([1]), [1]), []);
});
it('has R.equals semantics', function() {
function Just(x) { this.value = x; }
Just.prototype.equals = function(x) {
return x instanceof Just && R.equals(x.value, this.value);
};
eq(R.without([0], [-0]).length, 1);
eq(R.without([-0], [0]).length, 1);
eq(R.without([NaN], [NaN]).length, 0);
eq(R.without([[1]], [[1]]).length, 0);
eq(R.without([new Just([42])], [new Just([42])]).length, 0);
});
});
xor(x: boolean, y: boolean): boolean
const result = [
xor(true, true),
xor(false, false),
xor(false, true),
]
// => [false, false, true]
Try the above R.xor example in Rambda REPL
xor(x: boolean, y: boolean): boolean;
xor(y: boolean): (y: boolean) => boolean;
export function xor(a, b){
if (arguments.length === 1) return _b => xor(a, _b)
return Boolean(a) && !b || Boolean(b) && !a
}
import { xor } from './xor'
test('compares two values with exclusive or', () => {
expect(xor(true, true)).toEqual(false)
expect(xor(true, false)).toEqual(true)
expect(xor(false, true)).toEqual(true)
expect(xor(false, false)).toEqual(false)
})
test('when both values are truthy, it should return false', () => {
expect(xor(true, 'foo')).toEqual(false)
expect(xor(42, true)).toEqual(false)
expect(xor('foo', 42)).toEqual(false)
expect(xor({}, true)).toEqual(false)
expect(xor(true, [])).toEqual(false)
expect(xor([], {})).toEqual(false)
expect(xor(new Date(), true)).toEqual(false)
expect(xor(true, Infinity)).toEqual(false)
expect(xor(Infinity, new Date())).toEqual(false)
})
test('when both values are falsy, it should return false', () => {
expect(xor(null, false)).toEqual(false)
expect(xor(false, undefined)).toEqual(false)
expect(xor(undefined, null)).toEqual(false)
expect(xor(0, false)).toEqual(false)
expect(xor(false, NaN)).toEqual(false)
expect(xor(NaN, 0)).toEqual(false)
expect(xor('', false)).toEqual(false)
})
test('when one argument is truthy and the other is falsy, it should return true', () => {
expect(xor('foo', null)).toEqual(true)
expect(xor(null, 'foo')).toEqual(true)
expect(xor(undefined, 42)).toEqual(true)
expect(xor(42, undefined)).toEqual(true)
expect(xor(Infinity, NaN)).toEqual(true)
expect(xor(NaN, Infinity)).toEqual(true)
expect(xor({}, '')).toEqual(true)
expect(xor('', {})).toEqual(true)
expect(xor(new Date(), 0)).toEqual(true)
expect(xor(0, new Date())).toEqual(true)
expect(xor([], null)).toEqual(true)
expect(xor(undefined, [])).toEqual(true)
})
test.skip('returns a curried function', () => {
expect(xor()(true)(true)).toEqual(false)
expect(xor()(true)(false)).toEqual(true)
expect(xor()(false)(true)).toEqual(true)
expect(xor()(false)(false)).toEqual(false)
})
import {xor} from 'rambda'
describe('xor', () => {
it('happy', () => {
xor(true, false) // $ExpectType boolean
})
it('curry', () => {
xor(true)(false) // $ExpectType boolean
})
})
Reason for the failure: ramda support empty call of method
var R = require('../../../../dist/rambda.js');
var eq = require('./shared/eq');
describe('xor', function() {
it('returns a curried function', function() {
eq(R.xor()(true)(true), false);
eq(R.xor()(true)(false), true);
eq(R.xor()(false)(true), true);
eq(R.xor()(false)(false), false);
});
});
zip<K, V>(x: ReadonlyArray<K>, y: ReadonlyArray<V>): KeyValuePair<K, V>[]
It will return a new array containing tuples of equally positions items from both x and y lists.
The returned list will be truncated to match the length of the shortest supplied list.
const x = [1, 2]
const y = ['A', 'B']
R.zip(x, y)
// => [[1, 'A'], [2, 'B']]
// truncates to shortest list
R.zip([...x, 3], ['A', 'B'])
// => [[1, 'A'], [2, 'B']]
Try the above R.zip example in Rambda REPL
zip<K, V>(x: ReadonlyArray<K>, y: ReadonlyArray<V>): KeyValuePair<K, V>[];
zip<K>(x: ReadonlyArray<K>): <V>(y: ReadonlyArray<V>) => KeyValuePair<K, V>[];
export function zip(left, right){
if (arguments.length === 1) return _right => zip(left, _right)
const result = []
const length = Math.min(left.length, right.length)
for (let i = 0; i < length; i++){
result[ i ] = [ left[ i ], right[ i ] ]
}
return result
}
import { zip } from './zip'
const array1 = [ 1, 2, 3 ]
const array2 = [ 'A', 'B', 'C' ]
test('should return an array', () => {
const actual = zip(array1)(array2)
expect(actual).toBeInstanceOf(Array)
})
test('should return and array or tuples', () => {
const expected = [
[ 1, 'A' ],
[ 2, 'B' ],
[ 3, 'C' ],
]
const actual = zip(array1, array2)
expect(actual).toEqual(expected)
})
test('should truncate result to length of shorted input list', () => {
const expectedA = [
[ 1, 'A' ],
[ 2, 'B' ],
]
const actualA = zip([ 1, 2 ], array2)
expect(actualA).toEqual(expectedA)
const expectedB = [
[ 1, 'A' ],
[ 2, 'B' ],
]
const actualB = zip(array1, [ 'A', 'B' ])
expect(actualB).toEqual(expectedB)
})
import {zip} from 'rambda'
describe('zip', () => {
it('happy', () => {
const array1 = [1, 2, 3]
const array2 = ['A', 'B', 'C']
const result = zip(array1)(array2)
result // $ExpectType KeyValuePair<number, string>[]
})
})
zipObj<T>(keys: ReadonlyArray<string>, values: ReadonlyArray<T>): { [index: string]: T }
It will return a new object with keys of keys array and values of values array.
const keys = ['a', 'b', 'c']
R.zipObj(keys, [1, 2, 3])
//=> {a: 1, b: 2, c: 3}
// truncates to shortest list
R.zipObj(keys, [1, 2])
//=> {a: 1, b: 2}
Try the above R.zipObj example in Rambda REPL
zipObj<T>(keys: ReadonlyArray<string>, values: ReadonlyArray<T>): { [index: string]: T };
zipObj(keys: ReadonlyArray<string>): <T>(values: ReadonlyArray<T>) => { [index: string]: T };
import { take } from './take'
export function zipObj(keys, values){
if (arguments.length === 1) return yHolder => zipObj(keys, yHolder)
return take(values.length, keys).reduce((
prev, xInstance, i
) => {
prev[ xInstance ] = values[ i ]
return prev
}, {})
}
import { equals } from './equals'
import { zipObj } from './zipObj'
test('zipObj', () => {
expect(zipObj([ 'a', 'b', 'c' ], [ 1, 2, 3 ])).toEqual({
a : 1,
b : 2,
c : 3,
})
})
test('0', () => {
expect(zipObj([ 'a', 'b' ])([ 1, 2, 3 ])).toEqual({
a : 1,
b : 2,
})
})
test('1', () => {
expect(zipObj([ 'a', 'b', 'c' ])([ 1, 2 ])).toEqual({
a : 1,
b : 2,
})
})
test('ignore extra keys', () => {
const result = zipObj([ 'a', 'b', 'c', 'd', 'e', 'f' ], [ 1, 2, 3 ])
const expected = {
a : 1,
b : 2,
c : 3,
}
expect(equals(result, expected)).toBeTrue()
})
import {zipObj} from 'rambda'
describe('zipObj', () => {
it('happy', () => {
const result = zipObj(['a', 'b', 'c', 'd', 'e', 'f'], [1, 2, 3])
result // $ExpectType { [index: string]: number; }
})
})
Fix R.omit typings
Fix R.pick typings
Close Issue #460 -
R.pathsshould be curried
Close Issue #458 - wrong
R.propIstyping
Close Issue #408 - add
R.chain
Close Issue #430 - add
R.when
Also restore R.converge, R.findLast, R.findLastIndex and R.curryN as I have forgotten to export them when releasing 5.2.0.
Fix Typescript comment for every method
Release new documentation site
Ramda repo now holds all Rambdax methods and tests
Add R.converge and R.curryN from PR #412
Close Issue #410 - wrong implementation of
R.groupWith
Close Issue #411 - change the order of declared
R.maptypings rules
Move R.partialCurry to Rambdax(reason for major bump).
Use new type of export in Typescript definitions.
Approve PR #381 - add R.applySpec
Approve PR #375 - add lenses(Thank you @synthet1c)
Add R.lens
Add R.lensIndex
Add R.lensPath
Add R.lensProp
Add R.over
Add R.set
Add R.view
Sync with Ramda 0.27
Add R.paths
Add R.xor
Close Issue #373
Add R.cond
4.5.0 Add R.clamp
4.4.2 Improve R.propOr typings
4.4.1 Make R.reject has the same typing as R.filter
4.4.0 Several changes:
Close Issue #317 - add R.transpose
Close Issue #325 - R.filter should return equal values for bad inputs null and undefined
Approve suggestion for R.indexBy to accept string not only function as first argument.
Edit of R.path typings
4.2.0 Approve PR #314 - add R.and
4.1.1 Add missing typings for R.slice
4.1.0 Add R.findLast and R.findLastIndex
4.0.2 Fix R.isEmpty wrong behaviour compared to the Ramda method
4.0.1 Approve PR #289 - remove console.log in R.values method
4.0.0 Multiple breaking changes as Rambda methods are changed in order to increase the similarity between with Ramda
Add to Differences:
R.type can return 'NaN'
R.compose doesn't pass `this` context
R.clone doesn't work with number, booleans and strings as input
All breaking changes:
-- R.add works only with numbers
-- Fix R.adjust which had wrong order of arguments
-- R.adjust works when index is out of bounds
-- R.complement support function with multiple arguments
-- R.compose/pipe throws when called with no argument
-- R.clone works with Date value as input
-- R.drop/dropLast/take/takeLast always return new copy of the list/string
-- R.take/takeLast return original list/string with negative index
-- R.equals handles NaN and RegExp types
-- R.type/R.equals supports new Boolean/new Number/new Date/new String expressions
-- R.has works with non-object
-- R.ifElse pass all arguments
-- R.length works with bad input
-- R.propEq work with bad input for object argument
-- R.range work with bad inputs
-- R.times work with bad inputs
-- R.reverse works with strings
-- R.splitEvery throws on non-positive integer index
-- R.test throws just like Ramda when first argument is not regex
-- R.values works with bad inputs
-- R.zipObj ignores extra keys
This is pre 4.0.0 release and it contains all of the above changes
Close issue #287 - ts-toolbelt directory was changed but not reflected in files property in package.json
Close issue #273 - ts-toolbelt needs other type of export when isolatedModules TypeScript property
Close issue #245 - complete typings tests for methods that have more specific Typescript definitions
3.2.1 Fast fix for issue #273 - messed up typings
3.2.0 There are several changes:
Close issue #263 - broken curry typing solved by ts-toolbelt local dependency.
Add R.partialCurry typings.
Approve PR #266 that adds R.slice method.
3.1.0 This might be breaking change for Typescript users, as very different definitions are introduced. With the previous state of the definitions, it was not possible to pass dtslint typings tests.
R.either and R.both supports multiple arguments as they should.
Several methods added by @squidfunk - R.assocPath, R.symmetricDifference, R.intersperse, R.intersection and R.difference
3.0.1 Close issue #234 - wrong curry typing
3.0.0 Deprecate R.contains, while R.includes is now following Ramda API(it uses R.equals for comparision)
2.14.5 R.without needs currying
2.14.4 Close issue #227 - add index as third argument of R.reduce typings
2.14.2 Use R.curry with R.reduce as manual curry there didn't work as expected.
2.14.1 Fix wrong typescript with R.head - PR #228 pushed by @tonivj5
2.14.0 Add R.groupWith by @selfrefactor | Add R.propOr, R.mathMod, R.mean, R.median, R.negate, R.product by @ku8ar
2.12.0 Add R.propIs - PR #213 and add R.sum - issue #207
2.11.2 Close Rambdax issue #32 - wrong R.type when function is input
2.11.1 Approve PR #182 - Changed typings to allow object as input to R.forEach and R.map
2.11.0 Approve PR #179 - R.adjust handles negative index; R.all doesn't need R.filter
2.10.2 Close issue #175 - missing typescript file
2.10.0 Approve huge and important PR #171 submitted by @helmuthdu - Add comments to each method, improve Typescript support
2.9.0 R.toPairs and R.fromPairs
2.8.0 Approve PR #165 R.clone
2.7.1 expose src | Discussed at issue #147
2.7.0 Approve PR #161 R.isEmpty
2.6.0 R.map, R.filter and R.forEach pass original object to iterator as third argument | Discussed at issue #147
2.5.0 Close issue #149 Add R.partial | R.type handles NaN
2.4.0 Major bump of Rollup; Stop building for ES5
2.3.1 Close issue #90 | Add string type of path in R.pathOr
2.3.0 Close issue #89 | Fix missing Number TS definition in R.type
2.2.0 R.defaultTo accepts indefinite number of input arguments. So the following is valid expression: const x = defaultTo('foo',null, null, 'bar')
2.1.0 Restore R.zip using WatermelonDB implementation.
2.0.0 Major version caused by removing of R.zip and R.addIndex. Issue #85 rightfully finds that the implementation of R.addIndex is not correct. This led to removing this method and also of R.zip as it had depended on it. The second change is that R.map, R.filter are passing array index as second argument when looping over arrays. The third change is that R.includes will return false if input is neigher string nor array. The previous behaviour was to throw an error. The last change is to increase the number of methods that are passing index as second argument to the predicate function.
1.2.6 Use src folder instead of modules
1.2.5 Fix omit typing
1.2.4 Add missing Typescript definitions - PR#82
1.2.2 Change curry method used across most of library methods
1.2.1 Add R.assoc | fix passing undefined to R.map and R.merge issue #77
1.2.0 Add R.min, R.minBy, R.max, R.maxBy, R.nth and R.keys
1.1.5 Close issue #74 R.zipObj
1.1.4 Close issue #71 CRA fail to build rambda
1.1.2 Approve PR #67 use babel-plugin-annotate-pure-calls
1.1.1 Approve PR #66 R.zip
1.1.0 R.compose accepts more than one input argument issue #65
1.0.13 Approve PR #64 R.indexOf
1.0.12 Close issue #61 make all functions modules
1.0.11 Close issue #60 problem with babelrc
1.0.10 Close issue #59 add R.dissoc
1.0.9 Close issue #58 - Incorrect R.equals
1.0.8 R.map and R.filter pass object properties when mapping over objects
1.0.7 Add R.uniqWith
1.0.6 Close issue #52 - ES5 compatible code
1.0.5 Close issue #51
1.0.4 Close issue #50 - add R.pipe typings
1.0.3 R.ifElse accept also boolean as condition argument
1.0.2 Remove typedDefaultTo and typedPathOr | Add R.pickAll and R.none
1.0.0 Major change as build is now ES6 not ES5 compatible (Related to issue #46)| Making Rambda fully tree-shakeable| Edit Typescript definition
0.9.8 Revert to ES5 compatible build - issue #46
0.9.7 Refactor for Rollup tree-shake | Remove R.padEnd and R.padStart
0.9.6 Close issue #44 - R.reverse mutates the array
0.9.5 Close issue #45 - invalid Typescript typings
0.9.4 Add R.reject and R.without (PR#41 PR#42) | Remove 'browser' field in package.json due to Webpack bug 4674
0.9.3 Add R.forEach and R.times
0.9.2 Add Typescript definitions
0.9.1 Close issue #36 - move current behaviour of defaultTo to a new method typedDefaultTo; make defaultTo follow Ramda spec; add pathOr; add typedPathOr.
0.9.0 Add R.pipe PR#35
0.8.9 Add R.isNil
0.8.8 Migrate to ES modules PR33 | Add R.flip to the API | R.map/filter works with objects
0.8.7 Change Webpack with Rollup - PR29
0.8.6 Add R.tap and R.identity
0.8.5 Add R.all, R.allPass, R.both, R.either and R.complement
0.8.4 Learning to run yarn test before yarn publish the hard way
0.8.3 Add R.always, R.T and R.F
0.8.2 Add concat, padStart, padEnd, lastIndexOf, toString, reverse, endsWith and startsWith methods
0.8.1 Add R.ifElse
0.8.0 Add R.not, R.includes | Take string as condition for R.pick and R.omit
0.7.6 Fix incorrect implementation of R.values
0.7.5 Fix incorrect implementation of R.omit
0.7.4 issue #13 - Fix R.curry, which used to return incorrectly function when called with more arguments
0.7.3 Close issue #9 - Compile to es2015; Approve PR #10 - add R.addIndex to the API
0.7.2 Add Promise support for R.type
0.7.1 Close issue #7 - add R.reduce to the API
0.7.0 Close issue #5 - change name of curry to partialCurry; add new method curry, which works just like Ramda's curry
0.6.2 Add separate documentation site via docsify
Running benchmarks
TODO
Rambda references
Links to Rambda
FAQs
Lightweight and faster alternative to Ramda with included TS definitions
The npm package rambda receives a total of 551,776 weekly downloads. As such, rambda popularity was classified as popular.
We found that rambda demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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