map - nodef/extra-map GitHub Wiki

Transform values of a map.

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

function map(x, fm)
// x:  a map
// fm: map function (v, k, x)
const map = require('extra-map');

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

References