Mixins trong Dart

mixin Flyable {
  void fly() => print("Flying!");
}
 
mixin Swimmable {
  void swim() => print("Swimming!");
}
 
class Duck with Flyable, Swimmable {
  void quack() => print("Quack!");
}
 
var duck = Duck();
duck.fly();   // Flying!
duck.swim();  // Swimming!
duck.quack(); // Quack!

mixin Musical on Animal {
  void play() => print("$name is playing music");
}
 
class Cat extends Animal with Musical {
  Cat(String name) : super(name);
}