filter

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Subhajit Sahu edited this page Jun 17, 2020 · 17 revisions

Keeps entries which pass a test. 🏃 📼 📦 🌔 📒

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

entries.filter(x, fn);
// x:  entries
// fn: test function (v, k, x)

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

var x = new Map([['a', 1], ['b', 2], ['c', 3], ['d', 4], ['e', 5]]);
map.filter(x, v => v % 2 === 1);
// Map(3) { 'a' => 1, 'c' => 3, 'e' => 5 }

map.filter(x, v => v % 2 === 0);
// Map(2) { 'b' => 2, 'd' => 4 }

references