Javascript Prototypical Object

JavascriptPrototypicalObject.js

//This file is mean to help show how javascript classes are put together.

//Parent Class constructor
var A = function(foo) {
  //member variable
  this.foo = foo;
};

//member function
A.prototype.getSecret = function() {
  return this.foo;
};

//Child Class constructor
var B = function(foo, bar) {
  //Call parent constructor with arguments
  A.call(this,foo);
  //member variable
  this.bar = bar;
};
//define parent child relationship
B.prototype = Object.create(A.prototype);

//override a member function
B.prototype.getSecret = function() {
  return this.foo+this.bar;
};

var A = new A('hello');
A.getSecret(); //should be 'hello'
var B = new B('hello','world');
B.getSecret(); //should be 'helloworld'