the number of (unique) elements in Set.
Appends a new element with a specified value to the end of the Set.
Removes a specified value from the Set.
Returns true if an element in the Set existed and has been removed, or false if the element does not exist.
a boolean indicating whether an element with the specified value exists in the Set or not.
Despite its name, returns an iterable of the values in the set.
Returns an iterable of values in the set.
Set for Longs.
Uses fast string representation internally