isUnique

Checks if there are no duplicate values. 🏃 📼 📦 🌔 📒

Alternatives: compare, map.

array.isUnique(x, [fc], [fm]);
// x:  an array
// fc: compare function (a, b)
// fm: map function (v, i, x)

⏱️ Compare function => O(n²).

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

var x = [1, 2, -1, -2];
array.isUnique(x);
// true

array.isUnique(x, (a, b) => Math.abs(a) - Math.abs(b));
// false

array.isUnique(x, null, v => Math.abs(v));
// false

references

• Data.List.Unique.isUnique: Haskell
• List-Extra.allDifferent: elm
• List-Extra.allDifferentBy: elm
• is-iterable-uniq: @Richienb