js/class_mixins.js at master · ricol/js · GitHub

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alert = console.log

{
	// mixin
  let sayHiMixin = {
    sayHi() {
      alert(`Hello ${this.name}`);
    },
    sayBye() {
      alert(`Bye ${this.name}`);
    }
  };

  // usage:
  class User {
    constructor(name) {
      this.name = name;
    }
  }

  // copy the methods
  Object.assign(User.prototype, sayHiMixin);

  // now User can say hi
  new User("Dude").sayHi(); // Hello Dude!
}

{
  let sayMixin = {
    say(phrase) {
      alert(phrase);
    }
  };

  let sayHiMixin = {
    __proto__: sayMixin, // (or we could use Object.create to set the prototype here)

    sayHi() {
      // call parent method
      super.say(`Hello ${this.name}`); // (*)
    },
    sayBye() {
      super.say(`Bye ${this.name}`); // (*)
    }
  };

  class User {
    constructor(name) {
      this.name = name;
    }
  }

  // copy the methods
  Object.assign(User.prototype, sayHiMixin);

  // now User can say hi
  new User("Dude").sayHi(); // Hello Dude!
}