Faster alternative to 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

• Install
• Differences between Rambda and Ramda
• API
• Benchmark
• Use with ES5
• Changelog
• Additional info
• Browse by category

• Tree-shaking

Currently Rambda is more tree-shakable than Ramda

• Speed

Rambda is generally more performant than Ramda as the benchmarks can prove that.

You can clone this repo and run yarn run benchmark all to see for yourself.

• dot notation for R.path

Standard 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} })

• comma notation for R.pick and R.omit

Similar 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 included

Typescript definitions are included in the library, in comparison to Ramda, where you need to additionally install @types/ramda.

• More generic methods

Ramda has an overwhelming list of methods, as one could get lost putting all the methods in one's head. Rambda's much smaller number of total methods(109) I see as advantage compared to the 255 of Ramda.

Ramda methods has plenty of really deep FP Methods, which are in fact really great, but they come at the price of added complexity. Such complex mechanism in practice are rarely needed.

You can check the list with missing Ramda methods in Rambda list to assure that Rambda doesn't have any important misses.

• Use yarn add rambda for Webpack and Node.js usage

• For UMD usage either use ./dist/rambda.umd.js or following CDN link:

https://unpkg.com/[email protected]/dist/rambda.umd.js

• Rambda's type detect async functions and unresolved Promises. The returned values are 'Async' and 'Promise'.

• Rambda's type handle Not a number values and it returns NaN in this case.

• Rambda's path accepts 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 and filter pass object key as second argument when mapping over objects.

• Rambda's map and filter pass array index as second argument when mapping over arrays.

• Rambda's adjust, all, allPass, any, anyPass, findIndex and reject are passing index as second argument to the predicate function.

• Rambda's defaultTo accept indefinite number of arguments when non curried, i.e. R.defaultTo(2, foo, bar, baz).

• Rambda's startsWith/endsWith work only with strings, instead with array and strings.

• Rambda's equals doesn't protect against circular structures as Ramda.equals does.

• Rambda's flip works only for functions expecting two arguments.

• Rambda's partial doesn't need the input arguments to be wrapped as array.

• Rambda's partialCurry is not part of Ramda API.

• Rambda's includes acts as curried Javascript includes, while Ramda version uses R.equals to check if a list contains certain value. Also Ramda version will throw an error if input is neither string nor array, while Rambda version will return false.

If you need more Ramda methods in Rambda, you may either submit a PR or check the extended version of Rambda - Rambdax. In case of the former, you may want to consult with Rambda contribution guidelines.

add(a: number, b: number): number

R.add(2, 3) // =>  5

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adjust(replaceFn: Function, i: number, arr: T[]): T[]

It replaces i index in arr with the result of replaceFn(arr[i]).

R.adjust(
  a => a + 1,
  0,
  [0, 100]
) // => [1, 100]

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all(fn: Function, arr: T[]): boolean

It returns true, if all members of array arr returns true, when applied as argument to function fn.

const arr = [ 0, 1, 2, 3, 4 ]
const fn = x => x > -1

const result = R.all(fn, arr)
// => true

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allPass(rules: Function[], input: any): boolean

It returns true, if all functions of rules return true, when input is their argument.

const input = {
  a : 1,
  b : 2,
}
const rules = [
  x => x.a === 1,
  x => x.b === 2,
]
const result = R.allPass(rules, input) // => true

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always(x: any): Function

It returns function that always returns x.

const fn = R.always(7)

console.log(fn())// => 7

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any(condition: Function, arr: T[]): boolean

It returns true, if at least one member of arr returns true, when passed to the condition function.

R.any(a => a * a > 8)([1, 2, 3])
// => true

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anyPass(conditions: Function[]): Function

const isBig = a => a > 20
const isOdd = a => a % 2 === 1

const result = R.anyPass(
  [isBig, isOdd]
)(11)
// => true

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append(valueToAppend: T, arr: T[]): T[]

R.append(
  'foo',
  ['bar', 'baz']
) // => ['bar', 'baz', 'foo']

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assoc(prop: any, value: any, obj: object): object

Makes a shallow clone of obj, setting or overriding the property prop with the value value. Note that this copies and flattens prototype properties onto the new object as well. All non-primitive properties are copied by reference.

R.assoc('c', 3, {a: 1, b: 2})
//=> {a: 1, b: 2, c: 3}

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both(firstCondition: Function, secondCondition: Function, input: any): boolean

It returns true, if both function firstCondition and function secondCondition return true, when input is their argument.

const fn = R.both(
  a => a > 10,
  a => a < 20
)
console.log(fn(15)) //=> true
console.log(fn(30)) //=> false

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clone(objOrArr: T|T[]): T|T[] both Creates a deep copy of the value which may contain (nested) Arrays and Objects, Numbers, Strings, Booleans and Dates. Functions are assigned by reference rather than copied

const objects = [{}, {}, {}];
const objectsClone = R.clone(objects);
objects === objectsClone; //=> false
objects[0] === objectsClone[0]; //=> false

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compose(fn1: Function, ... , fnN: Function): any

It performs right-to-left function composition.

const result = R.compose(
  R.map(x => x * 2),both
  R.filter(x => x > 2)
)([1, 2, 3, 4])

// => [6, 8]

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complement(fn: Function): Function

It returns complemented function that accept input as argument.

The return value of complemented is the negative boolean value of fn(input).

const fn = R.complement(x => !x)

const result = fn(false) // => false

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concat(x: T[]|string, y: T[]|string): T[]|string

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'

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contains(valueToFind: T, arr: T[]): boolean

It returns true, if valueToFind is part of arr.

Note that while new versions of Ramda depricate this method, contains will remain in this library.

R.contains(2, [1, 2]) // => true
R.contains(3, [1, 2]) // => false

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curry(fn: Function): Function

It returns curried version of fn.

const addFourNumbers = (a, b, c, d) => a + b + c + d
const curriedAddFourNumbers = R.curry(addFourNumbers)
const f = curriedAddFourNumbers(1, 2)
const g = f(3)
const result = g(4) // => 10

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dec(x: number): number

It decrements a number.

R.dec(2) // => 1

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defaultTo(defaultValue: T, ...inputArguments: any[]): T

It either returns defaultValue, if all of inputArguments are undefined, null or NaN.

Or it returns the first truthy inputArguments instance(from left to right).

R.defaultTo('foo', undefined) // => 'foo'
R.defaultTo('foo', undefined, null, NaN) // => 'foo'
R.defaultTo('foo', undefined, 'bar', NaN, 'baz') // => 'bar'
R.defaultTo('foo', undefined, null, NaN, 'baz') // => 'baz'
R.defaultTo('foo', 'bar') // => 'bar'

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dissoc(prop: any, obj: object): object

It returns a new object that does not contain a prop property.

R.dissoc('b', {a: 1, b: 2, c: 3})
//=> {a: 1, c: 3}

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R.divide(71, 100) // => 0.71

drop(howManyToDrop: number, arrOrStr: T[]|string): T[]|String

It returns arrOrStr with howManyToDrop items dropped from the left.

R.drop(1, ['foo', 'bar', 'baz']) // => ['bar', 'baz']
R.drop(1, 'foo')  // => 'oo'

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dropLast(howManyToDrop: number, arrOrStr: T[]|String): T[]|String

It returns arrOrStr with howManyToDrop items dropped from the right.

R.dropLast(1, ['foo', 'bar', 'baz']) // => ['foo', 'bar']
R.dropLast(1, 'foo')  // => 'fo'

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endsWith(x: string, str: string): boolean

R.endsWith(
  'bar',
  'foo-bar'
) // => true

R.endsWith(
  'foo',
  'foo-bar'
) // => false

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either(firstCondition: Function, secondCondition: Function): Function

R.either(
  a => a > 10,
  a => a % 2 === 0
)(15) //=> true

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equals(a: any, b: any): boolean

It returns equality match between a and b.

It doesn't handle cyclical data structures.

R.equals(
  [1, {a:2}, [{b:3}]],
  [1, {a:2}, [{b:3}]]
) // => true

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R.F() // => false

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filter(filterFn: Function, x: Array|Object): Array|Object

It filters x iterable over boolean returning filterFn.

const filterFn = a => a % 2 === 0

const result = R.filter(filterFn, [1, 2, 3, 4])
// => [2, 4]

The method works with objects as well.

Note that unlike Ramda's filter, here object keys are passed as second argument to filterFn.

const result = R.filter((val, prop)=>{
  return prop === 'a' || val === 2
}, {a: 1, b: 2, c: 3})

// => {a: 1, b: 2}

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find(findFn: Function, arr: T[]): T|undefined

It returns undefined or the first element of arr satisfying findFn.

const findFn = a => R.type(a.foo) === 'Number'
const arr = [{foo: 'bar'}, {foo: 1}]

const result = R.find(findFn, arr)
// => {foo: 1}

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findIndex(findFn: Function, arr: T[]): number

It 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}]

const result = R.findIndex(findFn, arr)
// => 1

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flatten(arr: any[]): any[]

R.flatten([ 1, [ 2, [ 3 ] ] ])
// => [ 1, 2, 3 ]

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flip(fn: Function): Function

It returns function which calls fn with exchanged first and second argument.

const subtractFlip = R.flip(R.subtract)

const result = subtractFlip(1,7)
// => 6

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forEach(fn: Function, arr: Array): Array

It applies function fn over all members of array arr and returns arr.

const sideEffect = {}
const result = R.forEach(
  x => sideEffect[`foo${x}`] = x
)([1, 2])

console.log(sideEffect) //=> {foo1 : 1, foo2 : 2}
console.log(result) //=> [1, 2]

Note, that unlike Ramda's forEach, Rambda's one doesn't dispatch to forEach method of arr if arr has such method.

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fromPairs(list: any[]): object

It transforms a list to an object.

const list = [ [ 'a', 1 ], [ 'b', 2 ], [ 'c', [ 3, 4 ] ] ]
const expected = {
  a : 1,
  b : 2,
  c : [ 3, 4 ],
}

const result = R.fromPairs(list)
// expected === result

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groupBy(fn: Function, arr: Array): Object

It groups array arr by provided selector function fn.

R.groupBy(
  x => x.length,
  [ 'a', 'b', 'aa', 'bb' ]
)
// => { '1': ['a', 'b'], '2': ['aa', 'bb'] }

groupWith(fn: Function, arr: Array): Object

It creates a groups of array members defined by equality function fn.

const list = [ 4, 3, 6, 2, 2, 1 ]
const result = R.groupWith(
  (a,b) => a - b === 0,
  list
)
const expected = [
  [ 4, 3 ],
  [ 6 ],
  [ 2 ],
  [ 2, 1 ],
]
// result === expected

has(prop: string, obj: Object): boolean

• It returns true if obj has property prop.

R.has('a', {a: 1}) // => true
R.has('b', {a: 1}) // => false

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head(arrOrStr: T[]|string): T|string

It returns the first element of arrOrStr.

R.head([1, 2, 3]) // => 1
R.head('foo') // => 'f'

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identical(a: any, b: any): boolean

Returns true if its arguments are identical, false otherwise. Values are identical if they reference the same memory. NaN is identical to NaN; 0 and -0 are not identical.

const o = {};
R.identical(o, o); //=> true
R.identical(1, 1); //=> true
R.identical(1, '1'); //=> false
R.identical([], []); //=> false
R.identical(0, -0); //=> false
R.identical(NaN, NaN); //=> true

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identity(x: T): T

It just passes back the supplied arguments.

R.identity(7) // => 7

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ifElse(condition: Function|boolean, ifFn: Function, elseFn: Function): Function

It returns function, which expect input as argument and returns finalResult.

When this function is called, a value answer is generated as a result of condition(input).

If answer is true, then finalResult is equal to ifFn(input). If answer is false, then finalResult is equal to elseFn(input).

const fn = R.ifElse(
 x => x > 10,
 x => x*2,
 x => x*10
)

const result = fn(8)
// => 80

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inc(x: number): number

It increments a number.

R.inc(1) // => 2

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If input is neither string nor array, then this method will return false.

includes(target: any, input: any): boolean

R.includes(1, [1, 2]) // => true
R.includes('oo', 'foo') // => true
R.includes('z', 'foo') // => false
R.includes('z', null) // => false

!! Note that this method is not part of Ramda API.

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indexBy(fn: Function, arr: T[]): Object

It indexes array arr as an object with provided selector function fn.

R.indexBy(
  x => x.id,
  [ {id: 1}, {id: 2} ]
)
// => { 1: {id: 1}, 2: {id: 2} }

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indexOf(valueToFind: any, arr: T[]): number

It returns -1 or the index of the first element of arr equal of valueToFind.

R.indexOf(1, [1, 2]) // => 0
R.indexOf(0, [1, 2]) // => -1

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init(arrOrStr: T[]|string): T[]|string

• It returns all but the last element of arrOrStr.

R.init([1, 2, 3])  // => [1, 2]
R.init('foo')  // => 'fo'

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is(xPrototype: any, x: any): boolean

It returns true is x is instance of xPrototype.

R.is(String, 'foo')  // => true
R.is(Array, 1)  // => false

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isNil(x: any): boolean

It returns true is x is either null or undefined.

R.isNil(null)  // => true
R.isNil(1)  // => false

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isEmpty(x: any): boolean

It returns true is x is empty.

R.isEmpty(null)  // => true
R.isEmpty(undefined)  // => true
R.isEmpty('')  // => true
R.isEmpty([])  // => true
R.isEmpty({})  // => true

join(separator: string, arr: T[]): string

R.join('-', [1, 2, 3])  // => '1-2-3'

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keys(x: Object): string[]

R.keys({a:1, b:2})  // => ['a', 'b']

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last(arrOrStr: T[]|string): T|string

• It returns the last element of arrOrStr.

R.last(['foo', 'bar', 'baz']) // => 'baz'
R.last('foo') // => 'o'

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lastIndexOf(x: any, arr: T[]): number

It returns the last index of x in array arr.

R.equals is used to determine equality between x and members of arr.

Value -1 is returned if no x is found in arr.

R.lastIndexOf(1, [1, 2, 3, 1, 2]) // => 3
R.lastIndexOf(10, [1, 2, 3, 1, 2]) // => -1

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length(arrOrStr: Array|String): Number

R.length([1, 2, 3]) // => 3

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map(mapFn: Function, x: Array|Object): Array|Object

It returns the result of looping through iterable x with mapFn.

The method works with objects as well.

Note that unlike Ramda's map, here array keys are passed as second argument to mapFn.

const mapFn = x => x * 2
const resultWithArray = R.map(mapFn, [1, 2, 3])
// => [2, 4, 6]

const result = R.map((val, prop)=>{
  return `${prop}-${val}`
}, {a: 1, b: 2})
// => {a: 'a-1', b: 'b-2'}

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match(regExpression: Regex, str: string): string[]

R.match(/([a-z]a)/g, 'bananas') // => ['ba', 'na', 'na']

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max(x: Number|String, y: Number|String): Number|String

R.max(5,7) // => 7

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maxBy(fn: Function, x: Number|String, y: Number|String): Number|String

R.maxBy(Math.abs, 5, -7) // => -7

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merge(a: Object, b: Object)

It returns result of Object.assign({}, a, b).

R.merge({ 'foo': 0, 'bar': 1 }, { 'foo': 7 })
// => { 'foo': 7, 'bar': 1 }

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min(x: Number|String, y: Number|String): Number|String

R.max(5,7) // => 5

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minBy(fn: Function, x: Number|String, y: Number|String): Number|String

R.minBy(Math.abs, -5, -7) // => -5

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modulo(a: number, b: number):numberNumber

It returns the remainder of operation a/b.

R.module(14, 3) // => 2

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multiply(a: number, b: number): number

It returns the result of operation a*b.

R.multiply(4, 3) // => 12

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not(x: any): boolean

It returns inverted boolean version of input x.

R.not(true) //=> false
R.not(false) //=> true
R.not(0) //=> true
R.not(1) //=> false

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omit(propsToOmit: string[]|string, obj: Object): Object

It returns a partial copy of an obj with omitting propsToOmit

R.omit('a,c,d', {a: 1, b: 2, c: 3}) // => {b: 2}

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path(pathToSearch: string[]|string, obj: Object): any

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.

R.path('a.b', {a: {b: 1}}) // => 1

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pathOr(defaultValue: any, pathToSearch: string[]|string, obj: Object): any

pathFound is the result of calling R.path(pathToSearch, obj).

If pathFound is undefined, null or NaN, then defaultValue will be returned.

pathFound is returned in any other case.

R.pathOr(1, 'a.b', {a: {b: 2}}) // => 2
R.pathOr(1, ['a', 'b'], {a: {b: 2}}) // => 2
R.pathOr(1, ['a', 'c'], {a: {b: 2}}) // => 1

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partial(fn: Function, ...inputs: any[]): Function | any

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 = (salutation, title, firstName, lastName) => salutation + ', ' + title + ' ' + firstName + ' ' + lastName + '!'

const canPassAnyNumberOfArguments = partial(fn, 'Hello', 'Ms.')
const finalFn = canPassAnyNumberOfArguments('foo')

finalFn('bar') // =>  'Hello, Ms. foo bar!'

partialCurry(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.partialCurry(fn, {a: 2})
const result = curried({b: 3, c: 10})
// => 16

• Note that partialCurry is method specific for Rambda and the method is not part of Ramda's API

• You can read my argumentation for creating partialCurry here

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pick(propsToPick: string[], obj: Object): Object

It returns a partial copy of an obj containing only propsToPick properties.

R.pick(['a', 'c'], {a: 1, b: 2}) // => {a: 1}

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pipe(fn1: Function, ... , fnN: Function): any

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]

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pluck(property: string, arr: Object[]): any[]

It returns list of the values of property taken from the objects in array of objects arr.

R.pluck('a')([{a: 1}, {a: 2}, {b: 3}]) // => [1, 2]

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prepend(x: T, arr: T[]): T[]

It adds x to the start of the array arr.

R.prepend('foo', ['bar', 'baz']) // => ['foo', 'bar', 'baz']

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prop(propToFind: string, obj: Object): any

It returns undefined or the value of property propToFind in obj

R.prop('x', {x: 100}) // => 100
R.prop('x', {a: 1}) // => undefined

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propEq(propToFind: string, valueToMatch: any, obj: Object): boolean

It returns true if obj has property propToFind and its value is equal to valueToMatch.

const propToFind = 'foo'
const valueToMatch = 0

const result = R.propEq(propToFind, valueToMatch)({foo: 0})
// => true

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propIs(type: any, name: string, obj: Object): boolean

It Returns true if the specified object property is of the given type.

R.propIs(Number, 'x', {x: 1, y: 2});  //=> true
R.propIs(Number, 'x', {x: 'foo'});    //=> false
R.propIs(Number, 'x', {});            //=> false

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propOr(defaultValue: any, param: string, obj: Object): any

If the given, non-null object has an own property with the specified name, returns the value of that property. Otherwise returns the provided default value.

const theWall = { mother: 'Waters', comfortablyNumb: 'Gilmour/Waters' }
const authorOfWishYouWereHere = R.prop('wishYouWereHere')
const authorOfAtomHeartMotherWhenDefault = R.propOr('Pink Floyd', 'atomHeartMother')

authorOfWishYouWereHere(theWall)  //=> undefined
authorOfAtomHeartMotherWhenDefault(theWall) //=> 'Pink Floyd'

range(start: number, end: number): number[]

It returns a array of numbers from start(inclusive) to end(exclusive).

R.range(0, 3)   // => [0, 1, 2]

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reduce(iteratorFn: Function, accumulator: any, array: T[]): any

const iteratorFn = (acc, val) => acc + val
const result = R.reduce(iteratorFn, 1, [1, 2, 3])
// => 7

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reject(fn: Function, arr: T[]): T[]

It has the opposite effect of R.filter.

It will return those members of arr that return false when applied to function fn.

const fn = x => x % 2 === 1

const result = R.reject(fn, [1, 2, 3, 4])
// => [2, 4]

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repeat(valueToRepeat: T, num: number): T[]

R.repeat('foo', 2) // => ['foo', 'foo']

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replace(strOrRegex: string|Regex, replacer: string, str: string): string

It replaces strOrRegex found in str with replacer.

R.replace('foo', 'bar', 'foo foo') // => 'bar foo'
R.replace(/foo/, 'bar', 'foo foo') // => 'bar foo'
R.replace(/foo/g, 'bar', 'foo foo') // => 'bar bar'

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reverse(str: T[]): T[]

const arr = [1, 2]

const result = R.reverse(arr)
// => [2, 1]

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sort(sortFn: Function, arr: T[]): T[]

It returns copy of arr sorted by sortFn.

Note that sortFn must return a number type.

const sortFn = (a, b) => a - b

const result = R.sort(sortFn, [3, 1, 2])
// => [1, 2, 3]

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sortBy(sortFn: Function, arr: T[]): T[]

It returns copy of arr sorted by sortFn.

Note that sortFn must return value for comparison.

const sortFn = obj => obj.foo

const result = R.sortBy(sortFn, [
  {foo: 1},
  {foo: 0}
])

const expectedResult = [ {foo: 0}, {foo: 1} ]
console.log(R.equals(result, expectedResult))
// => true

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split(separator: string, str: string): string[]

R.split('-', 'a-b-c') // => ['a', 'b', 'c']

Source

Try in REPL

splitEvery(sliceLength: number, arrOrString: T[]|string): T[T[]]|string[]

• It splits arrOrStr into slices of sliceLength.

R.splitEvery(2, [1, 2, 3]) // => [[1, 2], [3]]
R.splitEvery(3, 'foobar') // => ['foo', 'bar']

Source

Try in REPL

startsWith(x: string, str: string): boolean

R.startsWith(
  'foo',
  'foo-bar'
) // => true

R.startsWith(
  'bar',
  'foo-bar'
) // => false

Source

Try in REPL

subtract(a: number, b: number): number

R.subtract(3, 1) // => 2

Source

Try in REPL

sum(listOfNumbers: number[]): number

R.sum([1,2,3,4,5]) // => 15

R.T() // => true

Source

tail(arrOrStr: T[]|string): T[]|string

• It returns all but the first element of arrOrStr

R.tail([1, 2, 3])  // => [2, 3]
R.tail('foo')  // => 'oo'

Source

Try in REPL

take(num: number, arrOrStr: T[]|string): T[]|string

• It returns the first num elements of arrOrStr.

R.take(1, ['foo', 'bar']) // => ['foo']
R.take(2, 'foo') // => 'fo'

Source

Try in REPL

takeLast(num: number, arrOrStr: T[]|string): T[]|string

• It returns the last num elements of arrOrStr.

R.takeLast(1, ['foo', 'bar']) // => ['bar']
R.takeLast(2, 'foo') // => 'oo'

Source

Try in REPL

tap(fn: Function, input: T): T

• It applies function to input and pass the input back. Use case is debuging in the middle of R.compose.

let a = 1
const sayX = x => (a = x)

const result = R.tap(sayX, 100)
// both `a` and `result` are `100`

Source

Try in REPL

test(regExpression: Regex, str: string): boolean

• Determines whether str matches regExpression

R.test(/^f/, 'foo')
// => true

Source

Try in REPL

times(fn: Function, n: number): T[]

It returns the result of applying function fn over members of range array. The range array includes numbers between 0 and n(exclusive).

R.times(R.identity, 5)
//=> [0, 1, 2, 3, 4]

Source

Try in REPL

toLower(str: string): string

R.toLower('FOO') // => 'foo'

Source

Try in REPL

toPairs(obj: object): any[]

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)
// expected === result

Source

Try in REPL

toString(x: any): string

R.toString([1, 2]) // => '1,2'

Source

Try in REPL

toUpper(str: string): string

R.toUpper('foo') // => 'FOO'

Source

Try in REPL

trim(str: string): string

R.trim('  foo  ') // => 'foo'

Source

Try in REPL

type(a: any): string

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'

const delay = ms => new Promise(resolve => {
  setTimeout(function () {
    resolve()
  }, ms)
})
R.type(delay) // => 'Promise'

Source

Try in REPL

uniq(arr: T[]): T[]

It returns a new array containing only one copy of each element in arr.

R.uniq([1, 1, 2, 1])
// => [1, 2]

Source

Try in REPL

uniqWith(fn: Function, arr: T[]): T[]

It returns a new array containing only one copy of each element in arr according to boolean returning function fn.

const arr = [
  {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 = R.uniqWith(fn, arr)

console.log(R.equals(result, expectedResult)) // => true

Source

Try in REPL

update(i: number, replaceValue: T, arr: T[]): T[]

It returns a new copy of the arr with the element at i index replaced with replaceValue.

R.update(0, 'foo', ['bar', 'baz'])
// => ['foo', baz]

Source

Try in REPL

values(obj: Object): Array

It returns array with of all values in obj.

R.values({a: 1, b: 2})
// => [1, 2]

Source

Try in REPL

without(a: T[], b: T[]): T[]

It will return a new array based on b array.

This array contains all members of b array, that doesn't exist in a array.

Method R.equals is used to determine the existance of b members in a array.

R.without([1, 2], [1, 2, 3, 4])
// => [3, 4]

Source

Try in REPL

zip(a: K[], b: V[]): Array

It will return a new array containing tuples of equally positions items from both lists. The returned list will be truncated to match the length of the shortest supplied list.

R.zip([1, 2], ['A', 'B'])
// => [[1, 'A'], [2, 'B']]

// truncates to shortest list
R.zip([1, 2, 3, 4], ['A', 'B'])
// => [[1, 'A'], [2, 'B']]

Source

Try in REPL

zipObj(a: K[], b: V[]): Object

It will return a new object with keys of a array and values of b array.

R.zipObj(['a', 'b', 'c'], [1, 2, 3])
//=> {a: 1, b: 2, c: 3}

// truncates to shortest list
R.zipObj(['a', 'b', 'c'], [1, 2])
//=> {a: 1, b: 2}

Source

Try in REPL

Results of running yarn benchmarks:

> add.js
Rambda.add x 72,564,688 ops/sec ±4.81% (73 runs sampled)
Ramda.add x 56,396,341 ops/sec ±4.23% (82 runs sampled)
Lodash.add x 35,946,727 ops/sec ±1.50% (87 runs sampled)

> adjust.js
Rambda.adjust x 7,035,757 ops/sec ±0.96% (92 runs sampled)
Ramda.adjust x 11,520,117 ops/sec ±1.33% (91 runs sampled)

> any.js
Rambda.any x 57,187,584 ops/sec ±3.01% (85 runs sampled)
Ramda.any x 10,380,996 ops/sec ±3.85% (82 runs sampled)
Lodash.some x 36,716,897 ops/sec ±3.95% (77 runs sampled)

> append.js
Rambda.append x 3,499,777 ops/sec ±3.18% (82 runs sampled)
Ramda.append x 2,964,099 ops/sec ±0.87% (93 runs sampled)

> assoc.js
Rambda.assoc x 4,002,722 ops/sec ±1.03% (91 runs sampled)
Ramda.assoc x 6,014,560 ops/sec ±1.20% (92 runs sampled)
Lodash.set x 14,148,999 ops/sec ±1.23% (88 runs sampled)

> clone.js
Rambda.clone x 495,003 ops/sec ±22.29% (58 runs sampled)
Ramda.clone x 60,313 ops/sec ±14.66% (54 runs sampled)
Lodash.cloneDeep x 370,928 ops/sec ±3.22% (82 runs sampled)

> compose.js
Rambda.compose x 6,565,224 ops/sec ±6.65% (74 runs sampled)
Ramda.compose x 482,147 ops/sec ±7.44% (71 runs sampled)
Lodash.flowRight x 1,907,860 ops/sec ±4.24% (80 runs sampled)

> contains.js
Rambda.contains x 38,642,695 ops/sec ±6.33% (67 runs sampled)
Ramda.contains x 9,979,350 ops/sec ±24.61% (47 runs sampled)
Lodash.includes x 30,027,499 ops/sec ±1.73% (86 runs sampled)

> defaultTo.js
Rambda.defaultTo simple x 51,090,366 ops/sec ±2.84% (81 runs sampled)
Ramda.defaultTo x 29,850,625 ops/sec ±4.67% (74 runs sampled)
Rambda.defaultTo (when several arguments) x 10,753,835 ops/sec ±10.84% (58 runs sampled)

> drop.js
Rambda.drop x 7,355,396 ops/sec ±12.03% (62 runs sampled)
Ramda.drop x 1,278,065 ops/sec ±5.91% (74 runs sampled)

> dropLast.js
Rambda.dropLast x 7,620,630 ops/sec ±8.58% (64 runs sampled)
Ramda.dropLast x 1,131,885 ops/sec ±4.18% (80 runs sampled)

> endsWith.js
Rambda.endsWith x 28,003,665 ops/sec ±5.59% (77 runs sampled)
Ramda.endsWith x 656,403 ops/sec ±6.09% (81 runs sampled)

> equals.js
Rambda.equals x 1,085,925 ops/sec ±5.85% (75 runs sampled)
Ramda.equals x 123,968 ops/sec ±5.05% (80 runs sampled)
Lodash.isEqual x 356,517 ops/sec ±5.28% (81 runs sampled)

> filter.js
Rambda.filter x 15,054,483 ops/sec ±5.32% (74 runs sampled)
Ramda.filter x 4,411,613 ops/sec ±5.60% (76 runs sampled)
Lodash.filter x 12,980,591 ops/sec ±3.44% (77 runs sampled)

> find.js
Rambda.find x 14,086,382 ops/sec ±7.00% (76 runs sampled)
Ramda.find x 6,968,369 ops/sec ±4.86% (76 runs sampled)
Lodash.find x 8,130,806 ops/sec ±13.27% (63 runs sampled)

> findIndex.js
Rambda.findIndex x 48,179,679 ops/sec ±8.31% (71 runs sampled)
Ramda.findIndex x 2,561,304 ops/sec ±17.39% (33 runs sampled)
Lodash.findIndex x 3,636,170 ops/sec ±11.57% (54 runs sampled)

> flatten.js
Rambda.flatten x 3,651,487 ops/sec ±12.96% (57 runs sampled)
Ramda.flatten x 585,856 ops/sec ±0.39% (90 runs sampled)
Lodash.flatten x 12,330,106 ops/sec ±1.48% (93 runs sampled)

> head.js
Rambda.head x 73,327,652 ops/sec ±3.95% (77 runs sampled)
Ramda.head x 4,281,233 ops/sec ±2.27% (87 runs sampled)
Lodash.head x 67,943,467 ops/sec ±3.43% (77 runs sampled)

> headString.js
Rambda.head (when string) x 75,729,481 ops/sec ±3.76% (78 runs sampled)
Ramda.head (when string) x 4,215,626 ops/sec ±2.33% (84 runs sampled)

> identical.js
Rambda.identical x 68,465,698 ops/sec ±4.76% (74 runs sampled)
Ramda.identical x 19,430,040 ops/sec ±2.18% (82 runs sampled)

> indexOf.js
Rambda.indexOf x 52,087,884 ops/sec ±2.80% (78 runs sampled)
Ramda.indexOf x 23,475,389 ops/sec ±2.57% (83 runs sampled)
Lodash.indexOf x 50,416,017 ops/sec ±4.27% (79 runs sampled)

> init.js
Rambda.init x 33,425,823 ops/sec ±3.40% (78 runs sampled)
Ramda.init x 2,732,046 ops/sec ±12.71% (69 runs sampled)
Lodash.initial x 32,728,924 ops/sec ±4.09% (78 runs sampled)

> initString.js
Rambda.init (when string) x 71,090,037 ops/sec ±3.79% (74 runs sampled)
Ramda.init (when string) x 1,849,154 ops/sec ±7.90% (69 runs sampled)

> isEmpty.js
Rambda.isEmpty x 16,658,518 ops/sec ±8.41% (69 runs sampled)
Ramda.isEmpty x 100,014 ops/sec ±6.48% (75 runs sampled)
Lodash.isEmpty x 972,958 ops/sec ±5.22% (79 runs sampled)

> last.js
Rambda.last x 66,518,805 ops/sec ±5.77% (69 runs sampled)
Ramda.last x 4,065,920 ops/sec ±2.83% (84 runs sampled)
Lodash.last x 64,817,997 ops/sec ±6.13% (73 runs sampled)

> map.js
Rambda.map x 29,936,120 ops/sec ±3.21% (76 runs sampled)
Ramda.map x 6,112,792 ops/sec ±2.47% (88 runs sampled)
Lodash.map x 28,685,845 ops/sec ±1.63% (90 runs sampled)

> match.js
Rambda.match x 4,646,951 ops/sec ±1.00% (92 runs sampled)
Ramda.match x 1,990,270 ops/sec ±2.17% (90 runs sampled)

> mathMod.js
Rambda.mathMod x 31,132,727 ops/sec ±1.99% (89 runs sampled)
Ramda.mathMod x 15,986,746 ops/sec ±2.21% (86 runs sampled)

> mean.js
Rambda.mean x 54,726,189 ops/sec ±2.68% (85 runs sampled)
Ramda.mean x 1,167,399 ops/sec ±0.63% (91 runs sampled)

> median.js
Rambda.median x 2,416,103 ops/sec ±1.19% (93 runs sampled)
Ramda.median x 688,465 ops/sec ±1.07% (89 runs sampled)

> merge.js
Rambda.merge x 9,303,698 ops/sec ±2.12% (88 runs sampled)
Ramda.merge x 6,342,019 ops/sec ±2.58% (87 runs sampled)
Lodash.merge x 3,443,832 ops/sec ±1.93% (88 runs sampled)

> negate.js
Rambda.negate x 76,127,966 ops/sec ±4.33% (79 runs sampled)
Ramda.negate x 5,251,317 ops/sec ±2.66% (87 runs sampled)

> omit.js
Rambda.omit x 16,556,936 ops/sec ±1.28% (88 runs sampled)
Ramda.omit x 4,935,868 ops/sec ±2.58% (86 runs sampled)
Lodash.omit x 461,559 ops/sec ±1.06% (82 runs sampled)

> path.js
Rambda.path x 21,030,510 ops/sec ±1.80% (88 runs sampled)
Ramda.path x 12,366,254 ops/sec ±1.88% (89 runs sampled)
Lodash.get x 22,054,744 ops/sec ±1.31% (92 runs sampled)

> pathOr.js
Rambda.pathOr x 5,662,819 ops/sec ±4.74% (79 runs sampled)
Ramda.pathOr x 5,571,989 ops/sec ±1.72% (85 runs sampled)

> pick.js
Rambda.pick x 9,939,191 ops/sec ±1.69% (88 runs sampled)
Ramda.pick x 2,715,845 ops/sec ±2.35% (90 runs sampled)
Lodash.pick x 1,062,961 ops/sec ±2.56% (83 runs sampled)

> pipe.js
Rambda.pipe x 4,508,406 ops/sec ±2.65% (85 runs sampled)
Ramda.pipe x 757,113 ops/sec ±1.62% (86 runs sampled)
Lodash.flow x 2,318,846 ops/sec ±0.98% (91 runs sampled)

> product.js
Rambda.product x 8,924,477 ops/sec ±0.75% (91 runs sampled)
Ramda.product x 1,364,863 ops/sec ±0.39% (89 runs sampled)

> prop.js
Rambda.prop x 23,457,990 ops/sec ±1.24% (90 runs sampled)
Ramda.prop x 2,736,492 ops/sec ±0.62% (90 runs sampled)

> propEq.js
Rambda.propEq x 14,389,769 ops/sec ±1.34% (89 runs sampled)
Ramda.propEq x 2,673,442 ops/sec ±0.59% (89 runs sampled)

> propIs.js
Rambda.propIs x 26,337,209 ops/sec ±2.17% (85 runs sampled)
Ramda.propIs x 8,519,778 ops/sec ±2.74% (86 runs sampled)

> propOr.js
Rambda.propOr x 49,257,830 ops/sec ±3.43% (75 runs sampled)
Ramda.propOr x 3,907,852 ops/sec ±2.01% (88 runs sampled)

> range.js
Rambda.range x 14,450,269 ops/sec ±2.21% (84 runs sampled)
Ramda.range x 7,354,755 ops/sec ±2.44% (85 runs sampled)
Lodash.range x 10,475,753 ops/sec ±1.81% (89 runs sampled)

> reduce.js
Rambda.reduce x 9,262,518 ops/sec ±2.69% (88 runs sampled)
Ramda x 2,524,600 ops/sec ±1.24% (88 runs sampled)
Lodash x 13,553,365 ops/sec ±0.98% (88 runs sampled)

import omit from 'rambda/lib/omit'

Latest version that has this feature is 2.3.1

• 2.14.0 Add R.groupWith by @selfrefactor | Add R.propOr, R.mathMod, R.mean, R.median, R.negate, R.product by @ku8ar

• 2.13.0 Add R.identical - PR #217 pushed 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

• 1.2.3 Doesn't exist because NPM is great at handling errors.

• 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

• 1.1.3 Approve PR #70 implement R.groupBy | Close issue #69

• 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

• To run all benchmarks

yarn run benchmark all

• To run single or number of benchmarks

yarn run benchmark add compose filter

Projects using Rambda

• string-fn

• tachyons-for-js

• react-append-to-body

• docker-voting-app-nodejs

• ig-api

• ldap-authenticate

• mat-che

Projects using Rambdax

• WatermelonDB

Rambda in the wild

• Interview with Dejan Totef at SurviveJS blog

• Argumentation of Rambda's curry method

• Trending in Javascripting.com list:

Links to Rambda

• (https://mailchi.mp/webtoolsweekly/web-tools-280)[Web Tools Weekly]

• (https://github.com/stoeffel/awesome-fp-js)[awesome-fp-js]

• (https://github.com/docsifyjs/awesome-docsify)[awesome-docsify]

__

addIndex

ap

apply

applySpec

applyTo

ascend

binary

bind

call

comparator

composeK

composeP

composeWith

construct

constructN

converge

curryN

descend

empty

invoker

juxt

lift

liftN

memoizeWith

nAry

nthArg

o

of

once

otherwise

partialRight

pipeK

pipeP

pipeWith

then

thunkify

tryCatch

unapply

unary

uncurryN

useWith

and

cond

or

pathSatisfies

propSatisfies

unless

until

when

aperture

chain

dropLastWhile

dropRepeats

dropRepeatsWith

dropWhile

findLast

findLastIndex

insert

insertAll

intersperse

into

mapAccum

mapAccumRight

mergeAll

move

pair

partition

reduceBy

reduced

reduceRight

reduceWhile

remove

scan

sequence

slice

splitAt

splitWhen

takeLastWhile

takeWhile

transduce

transpose

traverse

unfold

uniqBy

unnest

xprod

zipWith

assocPath

dissocPath

eqProps

evolve

forEachObjIndexed

hasIn

hasPath

invert

invertObj

keysIn

lens

lensIndex

lensPath

lensProp

mapObjIndexed

mergeDeepLeft

mergeDeepRight

mergeDeepWith

mergeDeepWithKey

mergeLeft

mergeRight

mergeWith

mergeWithKey

objOf

over

pickBy

project

props

set

toPairsIn

valuesIn

view

where

whereEq

clamp

countBy

difference

differenceWith

eqBy

gt

gte

innerJoin

intersection

lt

lte

pathEq

sortWith

symmetricDifference

symmetricDifferenceWith

union

unionWith

always

compose

curry

F

flip

identity

pipe

T

tap

add

dec

divide

inc

modulo

multiply

subtract

adjust

all

any

append

concat

contains

drop

dropLast

endsWith

filter

find

findIndex

flatten

forEach

groupBy

head

indexBy

indexOf

init

join

last

lastIndexOf

length

map

none

nth

pluck

prepend

range

reduce

reject

repeat

reverse

sort

splitEvery

startsWith

tail

take

takeLast

times

uniq

uniqWith

update

without

zipObj

allPass

anyPass

both

complement

defaultTo

either

ifElse

not

assoc

dissoc

has

keys

merge

omit

path

pathOr

pick

pickAll

prop

values

equals

max

maxBy

min

minBy

propEq

sortBy

is

isNil

type

match

replace

split

toLower

toString

toUpper

trim