unique

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wolfram77 edited this page Mar 27, 2020 · 28 revisions

Removes duplicate elements.

Alternatives: compare, map.

iterable.unique(x, [fn]);
// x:  an iterable
// fn: compare function (a, b)

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

var x = [1, 2, 3, 4, 2, 3].values();
[...iterable.unique(x)];
// [1, 2, 3, 4]

var x = [1, 2, 3, 4, -2, -3].values();
[...iterable.unique(x, (a, b) => Math.abs(a) - Math.abs(b))];
// [1, 2, 3, 4]

references