getMapValues method Null safety

Future<Map<int, dynamic>> getMapValues()

Implementation

Future<Map<int, dynamic>> getMapValues() async {
  Map<int, dynamic> resultList = Map();
  listControllers.asMap().forEach((key, controller) {
    resultList.putIfAbsent(key, () => controller.selectedItem ?? null);
  });
  return resultList;
}