| class Stack<T> { | |
| final List<T> _list = []; | |
| void push(T element) { | |
| _list.add(element); | |
| } | |
| T pop() { | |
| var element = _list.last; | |
| _list.removeLast(); | |
| return element; | |
| } | |
| T peek() { | |
| return _list.last; | |
| } | |
| bool get isEmpty => _list.isEmpty; | |
| bool get isNotEmpty => _list.isNotEmpty; | |
| } | |