difference method
override
Returns a new set with the the elements of this that are not in other
.
That is, the returned set contains all the elements of this Set that are
not elements of other
according to other.contains
.
Note that the returned set will use the default equality operation, which may be different than the equality operation this uses.
Implementation
Set<E> difference(Set<Object> other) =>
where((element) => !other.contains(element)).toSet();