飞镖：不带运行功能的返回变量

我有一系列看起来像这样的物品：

  final List<Map<String, String>> dateIdeas = [
    {'Description': 'Drink Cocktails','Image': 'assets/images/cocktailsfull.jpg'},
    {'Description': 'Go for dinner!', 'Image': "assets/images/dinner.jpg"},
];

当用户点击按钮时，第一项将从数组中删除。

removeItem() {
    setState(() {
      dateIdeas.removeAt(index);
    });
  }

这可以正常工作。但是，我希望用户能够撤消此操作。我对此的解决方案是执行以下操作：

1. Have the removeItem function return what the array looked like before the removal:

  Map<String, String> removeItemLiked() {
    final removed = dateIdeas[index];
    setState(() {
      _controller.reset();
      likes.add(dateIdeas[index]['Description']);
      dateIdeas.removeAt(index);
    });
    return removed;
  }

2. Have an undo function that adds the item back into the array at index 0:

  void undo() {
    setState(() {
      Map<String, String> result = removeItemLiked();
      dateIdeas.insert(0, result);
    });
  }

The issue here is that when triggering the undo function it also retriggers removeItem. How can I have the old array stored to a variable so I can always use it later on?