What is the JavaScript equivalent to a C# HashSet?

Question

I have a list of a few thousand integer keys. The only thing I need to do with this list is say whether or not a given value is in the list.

For C# I would use a

Answer 1

Use an object. To add a key to the set, do:

object[key] = true;

To test whether a key is in the set, do:

if (object.hasOwnProperty(key)) { ... }

To remove a key from the set, do:

delete object[key]