map$

Updates values based on map function.

array.map$(x, fn, [ths]);
// x:   an array (updated)
// fn:  map function (v, i, x)
// ths: this argument
// --> x

const array = require('extra-array');

var a = [1, 2, 3, 4];
array.map$(a, v => v * 2);
// [2, 4, 6, 8]

a;
// [2, 4, 6, 8]

references

• Array.prototype.map(): MDN web docs
• array_filter: PHP
• Data.List.map: Haskell