How to get unique values in an array

Question

How can I get a list of unique values in an array? Do I always have to use a second array or is there something similar to java\'s hashmap in JavaScript?

I am going

Answer 1

If you don't need to worry so much about older browsers, this is exactly what Sets are designed for.

The Set object lets you store unique values of any type, whether primitive values or object references.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set

const set1 = new Set([1, 2, 3, 4, 5, 1]);
// returns Set(5) {1, 2, 3, 4, 5}