Flutter/Dart中计算Map里value的出现最大次数

代码如下:

void main() {
  Map<String, Map<String, int>> numsList = {
    "1": {"appeared": 1},
    "2": {"appeared": 2},
    "3": {"appeared": 3},
    "4": {"appeared": 9},
    "5": {"appeared": 5},
  };


  int? maxAppearedValue = numsList.values
      .map((e) => e["appeared"])
      .reduce((a, b) => a! > b! ? a : b);
  print(maxAppearedValue);
}

利用map遍历numList里的每个value,然后通过reduce里的逻辑来获取最大的value(对map本身并无影响)