Checks if there are no duplicate values.
:package:
:smileycat:
:running:
:vhs:
:moon:
:scroll:
:newspaper:
:bluebook:
Alternatives: unique, isUnique.
Similar: isUnique, isDisjoint, intersection.
This is part of package extra-iterable.
iterable.isUnique(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, -1, -2];
iterable.isUnique(x);
// true
iterable.isUnique(x, (a, b) => Math.abs(a) - Math.abs(b));
// false
iterable.isUnique(x, null, v => Math.abs(v));
// false