Mixins

🎯 Mục tiêu: Code reuse với mixins.

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💡 Định nghĩa Mixin

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!

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📝 Mixin với on constraint

mixin Musical on Animal {
  void play() => print("$name is playing music");
}

class Cat extends Animal with Musical {
  Cat(String name) : super(name);
}

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✅ Checklist

• mixin cho reusable code
• with để apply mixins
• on để constrain mixin

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