Example of Enum with fields and methods implemented using Extensions. This example uses a constant list instead of switch.

main.dart

main(List<String> arguments) {
  final cat = Cat.white;
  print('cat name: ${cat.name}');

  cat.talk();
}

enum Cat {
  black,
  white,
  grey,
}

extension CatExtension on Cat {

  static const names = {
    Cat.black: 'Black Cat',
    Cat.white: 'White Cat',
    Cat.grey: 'Grey Cat',
  };

  String? get name => names[this];

  void talk() {
    print('meow');
  }
}