map$

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 ]

References

• Data.List.map() : Haskell
• Array.map() : MDN Web Docs
• array_map() : PHP