- iterator last on all structures with reversible iterators

stacks/arraystack/arraystack.go

@@ -149,6 +149,14 @@ func (iterator *Iterator) Reset() {
 	iterator.index = -1
 }
 
+// Last moves the iterator to the last element and returns true if there was a last element in the container.
+// If Last() returns true, then last element's index and value can be retrieved by Index() and Value().
+// Modifies the state of the iterator.
+func (iterator *Iterator) Last() bool {
+	iterator.index = iterator.stack.Size()
+	return iterator.Prev()
+}
+
 // String returns a string representation of container
 func (stack *Stack) String() string {
 	str := "ArrayStack\n"