main.dart

enum Key {
  key1,
  key2;
    
  T mapFor<T>({
    required T Function() key1,
    required T Function() key2,
  }) {
    switch (this) {
      case Key.key1: return key1();
      case Key.key2: return key2();
    }
  }
}

void main() {
  Key key = Key.key1;
  key.mapFor(
    key1: () => print('This was key1'),
    key2: () => print('This was key2'),
  );
}