# Set collections in JavaScript

`Set` сollections allow you to create arrays without duplicates. Let's see how to work with such collections. First you need to create a collection with the following command:

`let set = new Set;`

Once the collection has been created, new elements can be added to it using the `add` method:

`let set = new Set; set.add(1); set.add(2); set.add(3);`

At the same time, when trying to add an element that already exists in the collection, this element will not be added:

`let set = new Set; set.add(1); set.add(2); set.add(3); set.add(3); // will not be added, because it already exists`

Create a `Set` collection. Use the `add` method to add elements to it. Make sure there are no duplicate elements added.

← →
↑
en ru