const AnimalPrototype = {
  init(noise) {
    this.noise = noise;
    return this;
  },

  eat() {
    console.log("Om nom nom");
  },

  sleep() {
    console.log("Zzzzzzz");
  },

  makeNoise() {
    console.log(this.noise);
  }
};

const WingedCreatureMixin = {
  fly() {
    if (this.canFly) {
      console.log("I'm flyyyying");
    } else {
      console.log("I can't fly, you fools!");
    }
  }
};

const EggLayerMixin = {
  layEgg() {
    console.log("*Plop*");
  }
};

const MudWallowerMixin = {
  wallowInMud() {
    console.log("Aaaahh...");
  }
};

function createBird(noise, canFly = true) {
  const bird = Object.create(AnimalPrototype).init(noise);
  Object.assign(bird, WingedCreatureMixin, EggLayerMixin);
  bird.canFly = canFly;
  return bird;
}

function createFlyingPig() {
  const pig = Object.create(AnimalPrototype).init("Oink!");
  Object.assign(pig, MudWallowerMixin, WingedCreatureMixin);
  pig.canFly = true;
  return pig;
}

const owl2 = createBird("Hoot");
const kiwi2 = createBird("Shriek!", false);
const flyingPig = createFlyingPig();
owl2.makeNoise();
owl2.fly();
owl2.layEgg();
kiwi2.makeNoise();
kiwi2.fly();
kiwi2.layEgg();
flyingPig.makeNoise();
flyingPig.wallowInMud();
flyingPig.fly();
console.log(owl2, kiwi2, flyingPig);