[Dart] Mixin

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Mixins are a way of reusing a class’s code in multiple class hierarchies.

void main() {
  Animal animal = Animal();
  Bird().fly();
  Fish().swim();
  Duck().move();
  Duck().swim();
  Duck().fly();
}

mixin CanSwim {
  void swim() {
    print('change poisiton by swimming');
  }
}

mixin CanFly {
  void fly() {
    print('change poisiton by flying');
  }
}

class Animal {

  void move () {

    print('change position');
  }
}

class Fish extends Animal with CanSwim{

  @override
  void move () {
    super.move();
  }
}

class Bird extends Animal with CanFly{

  @override
  void move () {
    super.move();
  }
}

class Duck extends Animal with CanFly, CanSwim{

  @override
  void move () {
    super.move();
  }
}