filter$

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Subhajit Sahu edited this page Dec 2, 2022 · 17 revisions

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