如何在dart中反转地图？有没有内置函数

void main() {
  Map<String, int> originalMap = {
    'one': 1,
    'two': 2,
    'three': 3,
  };

  Map<int, String> reversedMap = {};
  originalMap.forEach((key, value) {
    reversedMap[value] = key;
  });

  print(reversedMap); // 输出: {1: one, 2: two, 3: three}
}

void main() {
  Map<String, int> originalMap = {
    'one': 1,
    'two': 2,
    'anotherOne': 1,
  };

  Map<int, List<String>> reversedMap = {};
  originalMap.forEach((key, value) {
    if (reversedMap.containsKey(value)) {
      reversedMap[value].add(key);
    } else {
      reversedMap[value] = [key];
    }
  });

  print(reversedMap); // 输出: {1: [one, anotherOne], 2: [two]}
}