Returns true . Returns true if there are no items in the collection, false otherwise. Returns a reference to the maximum or minimum element in self. Client data may be passed through parameter d . 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. Client data may be passed through parameter d . Removes and returns the item at position i in self. Removes and returns the first item in the collection.