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

like have been mention there is now Set on JS. Depending on your purposes you also may be interested on https://github.com/fsvieira/cset (I am its author), its a lazzy set lib, with common set operation, including cartesian product.