isUnique

Checks if there are no duplicate values.

array.isUnique(x, [fn]);
// x:  an array
// fn: compare function (a, b)
// --> true if no duplicates

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

references

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