fp-array is a group of functions to do declarative programming in a more convenient way than in Array.prototype
$ npm install fp-array
const map = require('fp-array').map const filter = require('fp-array').filter const reduce = require('fp-array').reduce const arr = [...] map(arr) .with(callback) [.and(callback2)] [...] .result() filter(arr) .is(callback) [.and(callback2)] [...] .result() reduce(arr, callback[, initialValue])const arr = [1, 2, 3] // callbacks const increment = n => n + 1 const double = n => n * 2 map(arr) .with(increment) .and(double) .and(String) .result() // ['4', '6', '8'] arr // [1, 2, 3]- Iterates only one time over
arr - Inmutable:
arrhas not mutated, a new Array is returned whenresult() - Declarative: Easy to read syntax
const arr = [1, 'a', true, 6, 0, 4, undefined, 10] const number = n => typeof n === 'number' const greaterThan4 = n => n > 4 const even = n => n % 2 === 0 filter(arr) .is(number) .and(even) .and(greaterThan4) .result() // [6, 10] arr // [1, 'a', true, 6, 0, 4, undefined, 10]Same notes than before applies.
const arr = [1, 2, 3] reduce( arr, (acc, currentValue) => acc + currentValue, 5 ) // 11reduce() works exactly like the original except now is outside the Array.prototype
More examples in tests.
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Copyright (c) 2016 Julio César Martín