一个自定义的dart list 示例

custom_list.dart

import 'dart:collection';

class MyList<E> extends Object with ListMixin<E> implements List<E> {
  var _array = <E>[];

  @override
  int get length => _array.length;

  @override
  void set length(int newLength) => _array.length = newLength;

  @override
  E operator [](int index) {
    return _array[index];
  }

  @override
  void operator []=(int index, E value) {
    _array[index] = value;
  }

  void insertFirst(E e) {
    this.insert(0, e);
  }
}

main(List<String> arguments) async {
  var myList = MyList<int>();
  myList.add(1);
  myList.add(2);
  myList.add(3);
  myList.add(4);
  myList.insertFirst(0);

  print(myList);
  print(myList.length);
}