oop-robodog.js

import {Animal, Dog} from './animals';
import {Robot} from './robots';

class RoboDog {
  constructor(animal, dog, robot) {
    this.animal = new animal();
    this.dog = new dog();
    this.robot = new robot();
  }
  move() {
    return this.animal.move();
  }
  bark() {
    return this.dog.bark();
  }
  chargeBattery() {
    return this.robot.chargeBattery();
  }
  roboBark() {
    return 2 * this.dog.bark();
  }
}

const roboDog = new RoboDog(Animal, Dog, Robot);
roboDog.roboBark();