filter$

Keep values which pass a test!

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

function filter$(x, ft)
// x:  an array (updated!)
// ft: test function (v, i, x)

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

var x = [1, 2, 3, 4, 5];
xarray.filter$(x, v => v % 2 === 1);
// → [ 1, 3, 5 ]

x;
// → [ 1, 3, 5 ]

var x = [1, 2, 3, 4, 5];
xarray.filter$(x, v => v % 2 === 0);
// → [ 2, 4 ]

References

• Data.List.filter() : Haskell
• Array.filter() : MDN Web Docs
• array_filter() : PHP
• _.remove() : Lodash
• _.without() : Lodash
• _.compact() : Lodash
• _.pull() : Lodash
• _.pullAll() : Lodash
• _.pullAllBy() : Lodash
• _.pullAllWith() : Lodash
• Array.filter() : Sugar.js
• Array.exclude() : Sugar.js
• Array.compact() : Sugar.js
• array-tools.where : @75lb