JavaScript · Collections, storage and utilities

Set

A collection of unique values with fast membership tests. Iteration keeps insertion order.

javascriptRunnable example javascript course

Syntax

new Set(values)

Example

Try it

const tags = new Set(["css", "html", "css"]);
tags.add("js");
console.log([...tags]);

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.