match.dart

typedef MatchValue<T> = T Function();

TValue match<TOptionType, TValue>(
  TOptionType selectedOption,
  Map<TOptionType, MatchValue<TValue>> branches, {
  MatchValue<TValue> defaultValue,
}) {
  if (branches.containsKey(selectedOption)) {
    return branches[selectedOption]();
  }

  defaultValue ??= () => null;

  return defaultValue();
}

enum Status {
  hello,
  world,
}

void main() {
  var status = Status.hello;

  match(
    status,
    {
      Status.hello: () => print('hello'),
      Status.world: () => print('world'),
    },
    defaultValue: () => print('Default'),
  );
}