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.
Faster alternative to Ramda in just 10kB
I admire Ramda as it is great library in what it does, but I used only small part of what it offers.
I wanted to optimize the size of my bundle, but already developed Ramda habits.
This lead me to the idea to recreate the funtionality of some Ramda methods and export that as library.
const R = require("rambda")
const result = R.compose(
R.filter(val => val>2),
R.flatten,
)([ [1], [2], [3], 4])
console.log(result) // => [3,4]
Use npm i rambda for Webpack and Node.js
For browser usage include in your HTML
https://cdnjs.cloudflare.com/ajax/libs/rambda/0.6.1/webVersion.js
Rambda shadows only small part of the Ramda's API.
A few things to note:
Rambda's methods should be compatible with most of the basic Ramda's methods. For more complex and Ramda specific methods(such as R.__), you should expect a mismatch.
Rambda's type detect async functions. The returned value is "Async"
Rambda's curry works in much different way than Ramda's curry. Please chech with the documentation of the method.
Rambda's map/filter work only for arrays, while Ramda's map/filter accept also objects.
Rambda's equals doesn't protect against circular structures as Ramda.equals does.
Rambda is tested for compatability with Ramda.flip, as this method could be useful in some cases.
If you need more Ramda methods, than what Rambda offers, you may check Rambdax
I haven't tested it fully, but the partial test shows that Ramda definitions can be used.
You need to replace declare module ramda with declare module rambda on line
10 and store the file as rambda.js in your flow-typed folder
add(a: Number, b: Number): Number
R.add(2, 3) //=> 5
adjust(replaceFn: Function, i:Number, arr:Array): Array
i index in arr with the result of replaceFn(arr[i])R.adjust(a => a + 1, 0, [0, 100]) //=> [1, 100]
any(condition: Function, arr: Array): Boolean
arr returns true, when passed to the condition functionR.any(a => a * a > 8)([1, 2, 3]) //=> true
R.any(a => a * a > 10)([1, 2, 3]) //=> false
append(valueToAppend: any, arr: Array): Array
R.append('foo', ['bar', 'baz']) //=> ['foo', 'bar', 'baz']
contains(valueToFind: any, arr: Array): Boolean
Returns true if valueToFind is part of arr
R.contains(2, [1, 2]) //=> true
R.contains(3, [1, 2]) //=> false
curry(fn: Function|Async, a: Object, b: Object): Function|Promise
When called with function fn and first set of input a, it will return a function.
This function will wait to be called with second set of input b and it will invoke fn with the merged object of a over b.
fn can be asynchronous function. In that case a Promise holding the result of fn is returned.
See the example below:
const fn = ({a, b, c}) => {
return (a * b) + c
}
const curried = R.curry(fn, {a: 2})
curried({b: 3, c: 10}) //=> 16
defaultTo(defaultArgument: T, inputArgument: any): T
Returns defaultArgument if inputArgument is undefined or the type of inputArgument is different of the type of defaultArgument.
Returns inputArgument in any other case.
R.defaultTo('foo', undefined) //=> 'foo'
R.defaultTo('foo')('bar') //=> 'bar'
R.defaultTo('foo')(1) //=> 'foo'
drop(howManyToDrop: Number, arrOrStr: Array|String): Array|String
Returns arrOrStr with howManyToDrop items dropped from the left
R.drop(1, ['foo', 'bar', 'baz']) //=> ['bar', 'baz']
R.drop(1, 'foo') //=> 'oo'
dropLast(howManyToDrop: Number, arrOrStr: Array|String): Array|String
Returns arrOrStr with howManyToDrop items dropped from the right
R.dropLast(1, ['foo', 'bar', 'baz']) //=> ['foo', 'bar']
R.dropLast(1, 'foo') //=> 'fo'
equals(a: any, b: any): Boolean
a and bDoesn't handles cyclical data structures
R.equals(1, 1) //=> true
R.equals({}, {}) //=> false
R.equals([1, 2, 3], [1, 2, 3]) //=> true
filter(filterFn: Function, arr: Array): Array
Filters arr throw boolean returning filterFn
const filterFn = a => a % 2 === 0
R.filter(filterFn, [1, 2, 3, 4]) //=> [2, 4]
find(findFn: Function, arr: Array): T|undefined
Returns undefined or the first element of arr satisfying findFn
const findFn = a => R.type(a.foo) === "Number"
const arr = [{foo: "bar"}, {foo: 1}]
R.find(findFn, arr) //=> {foo: 1}
findIndex(findFn: Function, arr: Array): Number
Returns -1 or the index of the first element of arr satisfying findFn
const findFn = a => R.type(a.foo) === "Number"
const arr = [{foo: "bar"}, {foo: 1}]
R.find(findFn, arr) //=> 1
flatten(arr: Array): Array
R.flatten([ 1, [ 2, [ 3 ] ] ]
//=> [ 1, 2, 3 ]
has(prop: String, obj: Object): Boolean
true if obj has property propR.has("a", {a: 1}) //=> true
R.has("b", {a: 1}) //=> false
head(arrOrStr: Array|String): any
arrOrStrR.head([1, 2, 3]) //=> 1
R.head('foo') //=> 'f'
indexOf(valueToFind: any, arr: Array): Number
Returns -1 or the index of the first element of arr equal of valueToFind
R.indexOf(1, [1, 2]) //=> 0
init(arrOrStr: Array|String): Array|String
arrOrStrR.init([1, 2, 3]) //=> [1, 2]
R.init('foo') //=> 'fo'
join(separator: String, arr: Array): String
R.join('-', [1, 2, 3]) //=> '1-2-3'
last(arrOrStr: Array|String): any
arrOrStrR.last(['foo', 'bar', 'baz']) //=> 'baz'
R.last('foo') //=> 'o'
length(arrOrStr: Array|String): Number
R.length([1, 2, 3]) //=> 3
map(mapFn: Function, arr: Array): Array
Returns the result of looping through arr with mapFn
const mapFn = x => x * 2;
R.map(mapFn, [1, 2, 3]) //=> [2, 4, 6]
map(regExpression: Regex, str: String): Array
R.match(/([a-z]a)/g, 'bananas') //=> ['ba', 'na', 'na']
merge(a: Object, b: Object)
Returns result of Object.assign({}, a, b)
R.merge({ 'foo': 0, 'bar': 1 }, { 'foo': 7 })
//=> { 'foo': 7, 'bar': 1 }
omit(propsToOmit: Array, obj: Object): Object
obj with omitting propsToOmitR.omit(['a', 'd'], {a: 1, b: 2, c: 3}) //=> {b: 2, c: 3}
path(pathToSearch: Array, obj: Object): any
pathToSearch in object objR.path(['a', 'b'], {a: {b: 2}}) //=> 2
R.path(['a', 'c'], {a: {b: 2}}) //=> undefined
pick(propsToPick: Array, obj: Object): Object
obj containing only propsToPick propertiesR.pick(['a', 'c'], {a: 1, b: 2}) //=> {a: 1}
pluck(prop: String, arr: Array): Array
- Returns list of the values of property
proptaken from the objects inarrR.pluck('a')([{a: 1}, {a: 2}]) //=> [1, 2]prepend
prepend(valueToPrepend: any, arr: Array): Array
R.prepend('foo', ['bar', 'baz']) //=> ['foo', 'bar', 'baz']prop(propToFind: String, obj: Object): any
Returns
undefinedor the value of propertypropToFindinobjR.prop('x', {x: 100}) //=> 100 R.prop('x', {}) //=> undefinedpropEq
propEq(propToFind: String, valueToMatch: any, obj: Object): Boolean
Returns true if
objhas propertypropToFindand its value is equal tovalueToMatchconst propToFind = "foo" const valueToMatch = 0 R.propEq(propToFind, valueToMatch)({foo: 0}) //=> true R.propEq(propToFind, valueToMatch)({foo: 1}) //=> falserange
range(start: Number, end: Number): Array
- Returns a array of numbers from
start(inclusive) toend(exclusive)R.range(0, 2) //=> [0, 1]repeat
repeat(valueToRepeat: T, num: Number): Array
R.repeat('foo', 2) //=> ['foo', 'foo']replace
replace(strOrRegex: String|Regex, replacer: String, str: String): String
Replace
strOrRegexfound instrwithreplacerR.replace('foo', 'bar', 'foo foo') //=> 'bar foo' R.replace(/foo/, 'bar', 'foo foo') //=> 'bar foo' R.replace(/foo/g, 'bar', 'foo foo') //=> 'bar bar'sort
sort(sortFn: Function, arr: Array): Array
Returns copy of
arrsorted bysortFn
sortFnmust returnNumberconst sortFn = (a, b) => a - b R.sort(sortFn, [3, 1, 2]) //=> [1, 2, 3]sortBy
Returns copy of
arrsorted bysortFn
sortFnmust return value for comparisonconst sortFn = obj => obj.foo R.sortBy(sortFn, [ {foo: 1}, {foo: 0} ]) //=> [{foo: 0}, {foo: 1}]split
split(separator: String, str: String): Array
R.split('-', 'a-b-c') //=> ['a', 'b', 'c']splitEvery
splitEvery(sliceLength: Number, arrOrString: Array|String): Array
- Splits
arrOrStrinto slices ofsliceLengthR.splitEvery(2, [1, 2, 3]) //=> [[1, 2], [3]] R.splitEvery(3, 'foobar') //=> ['foo', 'bar']subtract
subtract(a: Number, b: Number): Number
Returns
aminusbR.subtract(3, 1) //=> 2tail
tail(arrOrStr: Array|String): Array|String
- Returns all but the first element of
arrOrStrR.tail([1, 2, 3]) //=> [2, 3] R.tail('foo') //=> 'oo'take
take(num: Number, arrOrStr: Array|String): Array|String
- Returns the first
numelements ofarrOrStrR.take(1, ['foo', 'bar']) //=> ['foo'] R.take(2, ['foo']) //=> 'fo'takeLast
takeLast(num: Number, arrOrStr: Array|String): Array|String
- Returns the last
numelements ofarrOrStrR.takeLast(1, ['foo', 'bar']) //=> ['bar'] R.takeLast(2, ['foo']) //=> 'oo'test
test(regExpression: Regex, str: String): Boolean
- Determines whether
strmatchesregExpressionR.test(/^f/, 'foo') //=> true R.test(/^f/, 'bar') //=> falsetoLower
toLower(str: String): String
R.toLower('FOO') //=> 'foo'toUpper
toUpper(str: String): String
R.toUpper('foo') //=> 'FOO'trim
trim(str: String): String
R.trim(' foo ') //=> 'foo'type
type(a: any): String
R.type(() => {}) //=> "Function" R.type(async () => {}) //=> "Async" R.type([]) //=> "Array" R.type({}) //=> "Object" R.type('s') //=> "String" R.type(1) //=> "Number" R.type(false) //=> "Boolean" R.type(null) //=> "Null" R.type(/[A-z]/) //=> "RegExp"uniq
uniq(arr: Array): Array
- Returns a new array containing only one copy of each element in
arrR.uniq([1, 1, 2, 1]) //=> [1, 2] R.uniq([1, '1']) //=> [1, '1']update
update(i: Number, replaceValue: any, arr: Array): Array
- Returns a new copy of the
arrwith the element atiindex replaced withreplaceValueR.update(0, "foo", ['bar', 'baz']) //=> ['foo', baz]values
values(obj: Object): Array
- Returns array with of all values in
objR.values({a: 1, b: 2}) //=> [1, 2]Projects using Rambda
Articles about 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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