ES5/ES6 classes

es5-es6-classes.js

// ES5 does technically not have classes, and so the closest approximation would be something like this:
function Animal( name ) {
  this.name = name;
}

function Dog() {
  Animal.call( this, "Dog" );
}

Dog.prototype = Object.create(Animal.prototype);

Dog.prototype.bark = function bark() {
  alert("Woof!");
}

// ES6 adds a class keyword and allows you to "mimic" classical inheritance, but ultimatly it's just syntactic sugar.
  class Animal {
    constructor(name) {
      this.name = name;
    }
  }
  
  class Dog extends Animal {
    constructor() {
      super("Dog");
    }
    
    bark() {
      alert("Woof!");
    }
  }