plura

Plura

Super simple functional programming library

Installation

npm install plura --save

Roadmap

• monads...

Usage

Check tests for more usage information

Summary

• always
• ap
• chain
• compose
• curry
• curryDestructed
• curryObject
• filter
• find
• isArray
• isNumber
• isObject
• isString
• map
• pipe
• reduce
• reduceObjIndexed

always

Syntax

const getTen = always(10) // >> function
getTen() // >> 10

Parameters

• value

Return value

Function and if executed get value

ap

Syntax

ap([addTwo, minusOne], [1, 2, 3]) // >> [3, 4, 5, 0, 1, 2]

Parameters

• fns
  • array of functions
• values
  • array of values

Return value

Array of applied functions to a array of values

chain

Aka: flatMap

Syntax

chain(duplicate, [1, 2]) // >> [1, 1, 2, 2]

Parameters

• fn
  • function to change values
• array
  • array to change

Return value

Array

compose

Syntax

const minusOneTimesTo = compose(timeTwo, minusOne)
minusOneTimesTo(2) // >> 2

Parameters

• fns
  • as many functions you want
• arguments
  • initial arguments

Return value

Composed functions

curry

Syntax

const addC = curry(add)
addC(1, 1, 1) // >> 3
addC(1)(1)(1) // >> 3
addC(1)(1, 1) // >> 3

Parameters

• fn
  • function you want to curry
• arguments
  • as many arguments needed to fulfill fn parameters

Return value

Curry:ed function

curryDestructed

Syntax

// add must have simple destruction! : no rest ... or nested destructions
const add = ({ a, b, c}) => a + b + c

const addC = curryDestructed(add)
addC({a: 1, b: 1, c: 1})     // >> 3
addC({a: 1})({b: 1})({c: 1}) // >> 3
addC({c: 1})({b: 1, a: 1})   // >> 3

Parameters

• function you want to curry
• arguments
  • as many arguments needed to fulfill fn parameters

Return value

Curry:ed function

curryObject

Syntax

// with object
const objectTemplate = {
  a: '',
  b: '',
  c: '',
}
const addC = curryObject(objectTemplate, add)
addC({a: 1, b: 1, c: 1})     // >> 3
addC({a: 1})({b: 1})({c: 1}) // >> 3
addC({c: 1})({b: 1, a: 1})   // >> 3

// with array
const arrayTemplate = [
  'a',
  'b',
  'c',
]
const addC = curryObject(arrayTemplate, add)
addC({a: 1, b: 1, c: 1})     // >> 3
addC({a: 1})({b: 1})({c: 1}) // >> 3
addC({c: 1})({b: 1, a: 1})   // >> 3

Parameters

• template
  • template of object keys, object|array
• fn
  • function you want to curry
• arguments
  • as many arguments needed to fulfill fn parameters

Return value

Curry:ed function

filter

Syntax

filter(isEven, [2, 3, 6]) // >> [2]

Parameters

• fn
  • function you want to apply to check array elements
• array
  • array to filter over

Return value

Altred array

find

Syntax

find(hasIdOfOne, [{ id: 10 }, { id: 1 }]) // >> { id: 1 }

Parameters

• fn
  • function to evaluate values
• array
  • array to find value in
• initailValue
  • optional
  • if find doesn't find anything initialValue will be returned, default: undefined

Return value

Any, found value

isArray

Syntax

isArray([1, 2]) // >> true

Parameters

• any
  • checks if array or not

Return value

Boolean

isNumber

Syntax

isNumber(10) // >> true

Parameters

• any
  • checks if number or not

Return value

Boolean

isObject

Syntax

isObject({ x: 1 }) // >> true

Parameters

• any
  • checks if object or not

Return value

Boolean

isString

Syntax

isString('abc') // >> true

Parameters

• any
  • checks if string or not

Return value

Boolean

map

Syntax

map(addOne, [1, 2, 3]) // >> [2, 3, 4]

Parameters

• fn
  • function you want to apply to array elements
• array
  • array to map over

Return value

Altred array

pipe

Syntax

const minusOneTimesTo = pipe(timeTwo, minusOne)
minusOneTimesTo(2) // >> 3

Parameters

• fns
  • as many functions you want
• arguments
  • initial arguments

Return value

Composed functions

reduce

Syntax

reduce(merge, 0, [2, 3, 6]) // >> 9

Parameters

• fn
  • function you want to apply on array elements
• initialValue
  • start value for your reduce
• array || object
  • array || object to reduce over

Return value

Any

reduceobjindexed

Syntax

const addToArray = (a, [key, value]) => a.concat(key, value)

reduceObjIndexed(addToArray, [], {x: 2, y: 4}) // >> ['x', 2, 'y', 4]

Parameters

• fn
  • function you want to apply on array elements
• initialValue
  • start value for your reduce
• object
  • object to reduce over

Return value

Any