filter - nodef/extra-iterable GitHub Wiki

Keep the values which pass a test.

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

function filter(x, ft)
// x:  an iterable
// ft: test function (v, i, x)

const xiterable = require('extra-iterable');

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

[...xiterable.filter(x, v => v % 2 === 0)];
// → [2, 4]

References