ES6 ES2015: Easily remove duplicates from an Array

Say you have a JavaScript Array containing duplicate values. By creating a Set – which only stores unique values (primitive values or object references) – and then spreading that Set into a new Array you can easily dedupe the given Array:

// Array with duplicates
const arr = [7, 3, 1, 3, 3, 7];

// Dedupe using a Set, which is then spread into a new Array
const deduped = [...new Set(arr)];

// -> [ 7, 3, 1 ]

I really dig the spread operator. There’s some more interesting stuff you can do with it.