armade

armade is a ramda-ish alternative. It is, however, NOT a drop-in replacement. There are some main differences - i.e. all functions are curried, and armade doesn't provide an alternative where you can pass the normally curried parameter as an extra parameter in the outer function call. Example:

const square = (x: number) => x * x
map(square)([1, 2, 3]) // yes
map(square, [1, 2, 3]) // NO! Will give a TS error if you're using typescript, or not do anything if you are using JS

Why? To keep the API as straightforward as possible, and to keep the library size down.

Installation

npm i armade or yarn add armade

Usage

See complete docs for all functions, but here's an example:

import { append, map, pipe } from 'armade' // or from "armade/es" if your bundler doesn't detect es modules by itself

const myList = [1, 2, 3]
const square = (x: number) => x * x

const doStuff = pipe(
  append(4),
  map(square),
)

doStuff(myList) // [1, 4, 9, 16]

Sane TS definitions

armade is written TypeScript-first, so it comes with sane TypeScript definitions out of the box. No need to install extra packages, and there will never be discrepancies between the real world and the types. Good stuff.

Tree shakable

armade comes with esmodules out of the box, meaning it's tree shakable. package.json declares the modules field, so your favourite bundle should be able to find the esmodules automagically. But just in case it doesn't esmodules lives under armade/es, while CJS lives under armade/dist and is ofc declared as main.

Key differences to ramda

Apart from curried-only functions (described in the introduction), armade is still under development and some functions will be missing. Feel free to open an issue if your favourite utility isn't in here yet! However the goal isn't, as described, to be a drop-in replacement for ramda. In fact, some functions will be missing or different. For example armade doesn't come with addIndex, because map and reduce provides indexes out of the box in armade. Another example is ramdas chain - it's named flatMap in armade, just because that's a more common name imo.

Docs

add

Adds 2 numbers

add(1)(2) // 3

allPass

Checks if all provided functions return true, based on the input. Otherwise returns false

const checkFooBar = allPass([
  (thing: string) => thing.startsWith('foo'),
  (thing: string) => thing.endsWith('bar'),
])

checkFooBar('foobar') // /true
checkFooBar('foo') // false

always

Always return this value

const foo = always('foo')

foo() // 'foo'

and

Checks for and expressions. Not curried as of now

and(true, true) // true
and(true, false) // false

anyPass

Checks if any of the provided functions return true, based on the input. Otherwise returns false.

const checkFooBar = allPass([
  (thing: string) => thing.startsWith('foo'),
  (thing: string) => thing.endsWith('bar'),
])

checkFooBar('foobar') // /true
checkFooBar('foo') // true
checkFooBar('blargh') // false

append

Append a value to a list

append('baz')(['foo', 'bar']) // ['foo', 'bar', 'baz']

compose

Applies the given functions to the second value, starting with the last given one

const square = (x: number) => x * x
const minusOne = (x: number) => x - 1
compose(
  minusOne,
  square,
)(4) // 15

equals

Checks for equality, always with strict equals. Also deep equals arrays and objects

equals('1')(1) // false
equals('1')('1') // true
equals([1])([1, 2]) // false
equals([1, 2])([1, 2]) // true
equals({ foo: 'bar' })({ bar: 'baz' }) // false
equals({ foo: 'bar' })({ foo: 'bar' }) // true

filter

Filters a list

const isEven = (x: number) => x % 2 === 0
filter(isEven)([1, 2, 3, 4]) // [2, 4]

flatMap

Shallowly flattens an array of arrays.

flatMap([[1, 2], [3, 4]]) // [1, 2, 3, 4]
flatMap([[[1, 2]], [3]]) // [[1, 2], 3]

has

Checks whether an object as a specific key

has('foo')({ foo: 'bar' }) // true
has('blargh')({ foo: 'bar' }) // false

identity

Returns the same as you pass to it

identity('foo') // foo

ifElse

Takes something, checks for truthyness with the first parameter and executes the second function, that gets the passed value, if true or third function, that also gets the value, if false.

const checkIfIsFoo = ifElse(
  equals('foo'),
  (value) => 'yes, ' + value,
  (value) => 'no, ' + value,
)

checkIfIsFoo('foo') // 'yes, foo'
checkIfIsFoo('bar') // 'no, bar'

includes

Checks whether the passed list includes the value

includes('foo')(['foo', 'bar']) // true
includes('baz')(['foo', 'bar']) // false

isArray

Checks whether a given value is an arra

isArray([]) // true
isArray('blargh') // false

isNil

Checks whether a value is null or undefined

isNil('') // false
isNil(null) // true
isNil(undefined) // true

isObject

Checks whether the given value is an object

isObject('hello') // false
isObject({}) // true

keys

Gets the keys of a given object or array

keys({ foo: 'bar', baz: 'qux ' }) // ['foo', 'baz']
keys(['foo', 'bar']) // [0, 1]

map

Applies the given function to each item in the given list, returning a new list with the transformed values

const square = (x: number) => x * x

map(square)([1, 2, 3]) // [1, 4, 9]

not

Inverses a boolean value

not(true) // false

or

Checks if either of the given values are true. NOT curried as of now

or(true, false) // true
or(false, false) // false

path

Given a list of object properties it looks for each property deeply in the values

path(['foo', 'bar', 'baz'])({
  foo: {
    bar: {
      baz: 'quux',
    },
  },
}) // 'quux'
path(['foo', 'bar', 'length'])({
  foo: {
    bar: 'qux',
  },
}) // 3

pathOr

Like path but defaults to the value given in the first parameter if the path doesn't exist

pathOr('nope', ['foo', 'bar'])({
  foo: {
    bar: 'baz',
  },
}) // 'baz'
pathOr('nope', ['foo', 'bar'])({
  notFoo: 'blargh',
}) // 'nope'

pipe

Applies the given functions to the second value, starting with the first given one

const square = (x: number) => x * x
const minusOne = (x: number) => x - 1
pipe(
  square,
  minusOne,
)(4) // 15

prop

Gets a property from the given value

prop('foo')({ foo: 'bar' }) // 'bar'
prop('length')('foo') // 3

propOr

Gets a property from the given value, or the alternative if the prop is null or undefined

propOr('nope')({ foo: 'bar ' }) // 'bar'
propOr('nope')({ notFoo: 'bar' }) // 'nope'
propOr('length')('foo') // 3

reduce

Returns a single item by iterating through the list, successively calling the iterator function and passing it an accumulator value and the current value from the array, and then passing the result to the next call.

const addOrConcat = (accumulator, currentValue) => accumulator + currentValue
reduce(addOrConcat, '')(['foo', 'bar', 'baz']) // 'foobarbaz'
reduce(addOrConcat, 0)([1, 2, 3]) // 6

reverse

Reverses a list

reverse([1, 2, 3]) // [3, 2, 1]