Code Snippets - Unique array in JavaScript

This is another blog post I write about code snippets I find useful (you can check the other blog posts here and here). And today's code snippet is about how to get unique values from an array in JavaScript.

I have seen some versions of this snippet before, but the one I like to recommend the most is the use of a Set object alongside with the spread syntax in JavaScript.

By default, a Set is meant to store unique values and spreading it into an array is enough to give us the desired result.

const uniqueArray = (arr) => [...new Set(arr)]

uniqueArray(['ReactJS', 'NextJS', 'NodeJS', 'ReactJS']) // ['ReactJS', 'NextJS', 'NodeJS']

uniqueArray([1, 2, 2, 3, 3, 3, 4, 4, 4, 4]) // [1, 2, 3, 4]

I hope that's helpful and interesting to you. 👋🏼