# Sets

Sets are an unordered collection of unique objects. Typical methods are add() which will take only one argument at a time. In the example below, no error is raised when I try to add the number 2 a second time, the set is a collection of unique objects, the add is ignored.

<figure><img src="https://content.gitbook.com/content/waPIks0TDQHpI0Cy8Jml/blobs/C2moJetv8HED6vAJOgqo/image.png" alt=""><figcaption></figcaption></figure>

This can be useful!
