How to check if all elements in an array are unique in JavaScript?

i9hzdt.js

function hasDuplicates(array) {
    return (new Set(array)).size !== array.length;
}

console.log(hasDuplicates(["M", "A", "S", "A", "U", "T", "T"])); // --> true
console.log(hasDuplicates(["M", "A", "R", "E", "K"])); // --> false

// https://stackoverflow.com/questions/7376598/in-javascript-how-do-i-check-if-an-array-has-duplicate-values