Keeps values which pass a test. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

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

This is part of package extra-array.

This is browserified, minified version of @extra-array/filter-update. It is exported as global variable array_filter$. CDN: unpkg, jsDelivr.

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

const array = require("extra-array");

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

x;
// [ 1, 3, 5 ]

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

References

• Data.List.filter: Haskell
• Array.prototype.filter: MDN web docs
• array_filter: PHP
• _.remove: lodash
• _.without: lodash
• _.compact: lodash
• _.pull: lodash
• _.pullAll: lodash
• _.pullAllBy: lodash
• _.pullAllWith: lodash
• Array.filter: sugarjs
• Array.exclude: sugarjs
• Array.compact: sugarjs
• array-tools.where: @75lb