map$

Transform values of a map.

Alternatives: map, map$.
Similar: map, reduce, filter, filterAt, reject, rejectAt.

function map$(x, fm)
// x:  a map (updated)
// fm: map function (v, k, x)

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

var x = new Map([['a', 1], ['b', 2], ['c', 3], ['d', 4]]);
map.map$(x, v => v * 2);
// → Map(4) { 'a' => 2, 'b' => 4, 'c' => 6, 'd' => 8 }

x;
// → Map(4) { 'a' => 2, 'b' => 4, 'c' => 6, 'd' => 8 }

References

• Data.List.map: Haskell
• Array.prototype.map: MDN web docs
• array_map: PHP
• Array.map: sugarjs
• filter-collection: @dimd13