union ( bag : Bag(T) ) : Bag(T)

Returns a Bag containing all elements of self and all elements of *bag*.

Expression	Result
Bag{'a', 'b', 'a'}->union(Bag{'b', 'c'})	Bag{'a', 'b', 'a', 'c'}
Set{1,2,3}->union(Set{2,3,4})	Set{1,2,3,4}