Returns true . Returns true if there are no items in the collection, false otherwise. Returns true if the collection is sorted relative to the supplied comparator object, false otherwise. Returns the number of items inserted. Returns rwnil if there is no such element.
Returns rwnil if there is no such element.
Returns the number of items removed. Returns the number of items removed. Removes and returns the item at position i in self. This position must be between zero and one less then the number of entries in the collection, otherwise the function throws an exception of type RW BoundsErr . Removes and returns the first item in the collection.