1.0.1 • Published 3 years ago
@jamiri/filter-map v1.0.1
filter-map
Array utility to help writing filter/map separately without struggling with reduce
Description
Have you ever experienced writing filtering and mapping over an array at the same time? will you go for this way:
const res = [1, 2, 3, 4, 5].filter(it => it % 2 === 0).map(it => it ** 3) // Two iterations
console.log(res) // [8, 64]
Then I guess you have a colleague that adds a review comment to use Array's reduce to perform less iterations. Why bother writing it with reduce when you can do:
const res = [1, 2, 3, 4, 5].filterMap(it => it % 2 === 0, it => it ** 3) // One iteration
console.log(res) // [8, 64]
Installing
npm i -S @jamiri/filter-map
or
yarn add @jamiri/filter-map
Importing
Nodejs
require('filter-map')
console.log([1, 2, 3].filterMap(x => x > 1, x => x * 3))
Webpack
import 'filter-map'
console.log([1, 2, 3].filterMap(x => x > 1, x => x * 3))
Api
Upon requireing/importing the package following functions are added to the array prototype
filterMap(filterFn, mapFn)
mapFilter(mapFn, filterFn)
These are now available on instances of arrays i.e. all arrays from there on.