map$ - nodef/extra-array GitHub Wiki
Transform values of an array!
Alternatives: map, map$. Similar: map, filter, reject, reduce.
function map$(x, fm)
// x: an array (updated!)
// fm: map function (v, i, x)
const xarray = require('extra-array');
var x = [1, 2, 3, 4];
xarray.map$(x, v => v * 2);
// → [ 2, 4, 6, 8 ]
x;
// → [ 2, 4, 6, 8 ]