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.

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Published by Bramus!

Bramus is a frontend web developer from Belgium, working as a Chrome Developer Relations Engineer at Google. From the moment he discovered view-source at the age of 14 (way back in 1997), he fell in love with the web and has been tinkering with it ever since (more …)

Unless noted otherwise, the contents of this post are licensed under the Creative Commons Attribution 4.0 License and code samples are licensed under the MIT License

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