Is there a library for a Set data type in Javascript?

Question

Since Javascript doesn't have a built in set datatype has anyone come across a decent library for sets and set operations like union, intersection, etc?

Answer 1

Have a look at JS.Set.

The JS.Set class can be used to model collections of unique objects. A set makes sure that there are no duplicates among its members, and it allows you to use custom equality methods for comparison as well as JavaScript’s === operator.

It contains methods like union, intersection, merge, etc ...