flutter - 如何在Dart/Flutter中迭代2个不同数组中的每个值？

Question

请提供有关Dart逻辑的帮助，
我有2个数组:

option1 = ["green", "yellow", "purple"
option2 = [32,33]

我想将它们迭代为:

mergedArray = [["green", 32], ["green", 33], ["yellow", 32], ["yellow",33], ["purple",32], ["purple",33]]

帮助将不胜感激，谢谢🙏

Answer 1

您可以为此使用两个for循环。循环遍历option2，然后在其内部循环遍历option1。在option1的for循环内，您可以将其添加到列表中。

void main() {
  final List<String> option1 = ["green", "yellow", "purple"];
  final List<int> option2 = [32, 33];
  List<List<dynamic>> myList=[];
  for (var item2 in option2) {
    for (var item1 in option1) {
      myList.add([item1, item2]);
    }
  }
  print(myList);
}

输出:

[[green, 32], [yellow, 32], [purple, 32], [green, 33], [yellow, 33], [purple, 33]]