ho-js.5.2.js

/* Object Oriented JavaScript */
class Animal { 
  constructor(name) {
    this.name = name;
  }
  
  speak() {
    console.log(`${this.name} makes a noise.`);
  }
}

class Dog extends Animal {
  constructor(name) {
    super(name); // call the super class constructor and pass in the name parameter
  }

  speak() {
    console.log(`${this.name} barks.`);
  }
}

/*
  let d = new Dog('Mitzie');
  d.speak(); // Mitzie barks.
*/