Basic queue in Dart

queuelist.dart

import 'dart:collection';

/// Basic Queue (LIFO)
class QueueList<T> {
  final ListQueue<T> _list = ListQueue();

  /// Is empty?
  bool get isEmpty => _list.isEmpty;

  /// Not empty?
  bool get isNotEmpty => _list.isNotEmpty;

  /// Put element on top
  void push(T e) {
    _list.addFirst(e);
  }

  /// Get the top of the queue (and remove)
  T pop() {
    final res = _list.first;
    _list.removeFirst();
    return res;
  }

  /// Get the top of the queue (no delete)
  T top() {
    return _list.first;
  }
}