Factory design pattern

factory.js

// Animal factory
const Animal = function(name){
    const animal = {};
    animal.name = name;
    animal.walk = function(){
        console.log(this.name + " walks");
    }
    return animal;
};

// Robot factory
const Robot = function(name) {
  const robot = {}
  robot.name = name;
  robot.speak = function(message) {
    console.log(robot.name + " speaks " + message)
  }
  return robot;
}

// Mixins
const canKill = {
  kill() {
    console.log("I can kill")
  }
}

const canFly = {
  fly(h) {
    console.log("I can fly " + h "meters high")
  }
}
const canDance = {
  dance() {
    console.log("Look Maa !! I'm dancing")
  }
}
// End Mixins

// note the Object.assign() method in manipulating objects
k1 = Object.assign(Animal("k1"), canKill)  
brian = Object.assign(Animal("brian"), canKill, canFly, canDance)
roboDog = Object.assign(Animal("roboDog"), Robot("roboDog"))


k1.kill();
k1.walk();

brian.walk()
brian.fly(200)
brian.kill()
brian.dance()

killingRoboDog = Object.assign({}, roboDog, canKill)
killingRoboDog.walk()
killingRoboDog.kill()
killingRoboDog.speak("roboDog will kill you")

// resources https://medium.com/front-end-weekly/understand-the-factory-design-pattern-in-plain-javascript-20b348c832bd