magic_trick.dart

abstract class BaseObject {
  final String species;

  BaseObject(this.species);
}

class Rabbit extends BaseObject {
  Rabbit(String species) : super(species);
}

class Orange extends BaseObject {
  Orange(String species) : super(species);
}

T doMagicPerformance<T extends BaseObject>(BaseObject object) {
  // Hide orange in hat
  final hiddenObject = object.species;

  // Do magic
  for (var i = 0; i <= 10; i++) {
    print('Abracadabra'[i]);
  }
   final newObject = T(hiddenObject.species);

   // Abracadabra!
   return newObject;
}

void main() {
  Orange orange = Orange('Citrus sinesis');
  Rabbit rabbit = doMagicPerformance<Rabbit>(orange);
  print(rabbit.species);
}