Dart generic methods

bunny.dart

abstract class Bunny {
  String name;
  void attack();
}

class Fluffy extends Bunny {
  void attack() {
    print('Licks hands violently');
  }
}

class BloodBunny extends Bunny {
  void attack() {
    print('Rips throat open');
  }
}

T createBunny<T extends Bunny>(String name)  {
  Bunny bunny;
  if (T is Fluffy) {
    bunny = new Fluffy()
      ..name = name;
  } else if (T is BloodBunny) {
    bunny = new BloodBunny()
      ..name = name;
  } else {
    print('Fatal: Unexpected type T: ' + T.toString());
  }
  return bunny;
}

main() {

  final bunny = createBunny<Fluffy>('Priscilla');
  bunny.attack();

}

Will output:

Fatal: Unexpected type T: dynamic
Unhandled exception:
NoSuchMethodError: The method 'attack' was called on null.
Receiver: null
Tried calling: attack()
#0 Object._noSuchMethod (dart:core-patch/object_patch.dart:43)
#1 Object.noSuchMethod (dart:core-patch/object_patch.dart:47)
#2 main (file:///C:/Users/aszepeshazi/IdeaProjects/video-service-connector/bin/bunny.dart:35:9)
#3 _startIsolate. (dart:isolate-patch/isolate_patch.dart:265)
#4 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:151)