Removes duplicate values.
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Alterantives: unique, isUnique.
This is part of package extra-iterable.
iterable.unique(x, [fc], [fm]);
// x: an iterable
// fc: compare function (a, b)
// fm: map function (v, i, x):stopwatch: Compare function => O(n²).
const iterable = require("extra-iterable");
var x = [1, 2, 3, 4, 2, 3];
[...iterable.unique(x)];
// [ 1, 2, 3, 4 ]
var x = [1, 2, 3, 4, -2, -3];
[...iterable.unique(x)];
// [ 1, 2, 3, 4, -2, -3 ]
[...iterable.unique(x, (a, b) => Math.abs(a) - Math.abs(b))];
// [ 1, 2, 3, 4 ]
[...iterable.unique(x, null, v => Math.abs(v))];
// [ 1, 2, 3, 4 ]