filter$

Keep values which pass a test.

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

function filter$(x, ft)
// x:  a set (updated)
// ft: test function (v, v, x)

const set = require('extra-set');

var x = new Set([1, 2, 3, 4, 5]);
set.filter$(x, v => v % 2 === 1);
// → Set(3) { 1, 3, 5 }

x;
// → Set(3) { 1, 3, 5 }

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