Sub-classing-with-extendsSection-es6-es5

by upigilam

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.');
  }
}

// ES5
/* let d = new Dog('Mitzie');
d.speak(); // Mitzie barks.

function Animal (name) {
  this.name = name;  
}

Animal.prototype.speak = function () {
  console.log(this.name + ' makes a noise.');
}

class Dog extends Animal {
  speak() {
    console.log(this.name + ' barks.');
  }
} */

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