An example of how backbone extends object

hello-world.js

// Javascript function as an object (class)
var Person = {
  sayHello: function (otherPerson) {
    console.log("Hello, "+otherPerson.name+"!");
  },
  name: 'Anon',
  new: function (name) {
    this.name = name;
    return this;
  }
}

// You'd use Person.new(name) to create a person vs. `new Person(name)`
john = Person.new('John Doe');
jane = Person.new('Jane');

// This returns a function object
john.sayHello;

// Properties that return a function can be called with parens
john.sayHello(jane);

jquery-extend.js

// NOTE: Backbone uses underscore not jQuery.

// Skip to the bottom of this function!
// ---
// Loads jQuery as the variable '$'
(function() {
    // Load the script
    var script = document.createElement("SCRIPT");
    script.src = 'https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js';
    script.type = 'text/javascript';
    document.getElementsByTagName("head")[0].appendChild(script);

    // Poll for jQuery to come into existance
    var checkReady = function(callback) {
        if (window.jQuery) {
            callback(jQuery);
        }
        else {
            window.setTimeout(function() { checkReady(callback); }, 100);
        }
    };

    // Start polling...
    checkReady(function($) {
        // Use $ here...
    });
})();

/// Defined Person.extend(otherObject)
var Person = {
  sayHello: function (otherPerson) {
    console.log("Hello, "+otherPerson.name+"!");
  },
  name: 'Anon',
  new: function (name) {
    this.name = name;
    return this;
  },
  extend: function(otherObject) {
    return $.extend(otherObject, this);
  }
}

var HardWorker = Person.extend({
  isReliable: true
});

john = Person.new('John Doe');
console.log(john.name+" is reliable: "+john.isReliable);

jane = HardWorker.new('Jane Doe')
console.log(jane.name+" is reliable: "+jane.isReliable);