An example showing the difference between prototypal inheritance and raw object usage in JavaScript

classy.js

function Foo(who) {
    this.me = who;
}

Foo.prototype.identify = function() {
    return "I am " + this.me;
};

function Bar(who) {
    Foo.call(this,who);
}

Bar.prototype = Object.create(Foo.prototype);
// NOTE: .constructor is borked here, need to fix

Bar.prototype.speak = function() {
    alert("Hello, " + this.identify() + ".");
};

var b1 = new Bar("b1");
var b2 = new Bar("b2");

b1.speak(); // alerts: "Hello, I am b1."
b2.speak(); // alerts: "Hello, I am b2."

rawObject.js

var Foo = {
    init: function(who) {
        this.me = who;
    },
    identify: function() {
        return "I am " + this.me;
    }
};

var Bar = Object.create(Foo);

Bar.speak = function() {
    alert("Hello, " + this.identify() + ".");
};

var b1 = Object.create(Bar);
b1.init("b1");
var b2 = Object.create(Bar);
b2.init("b2");

b1.speak(); // alerts: "Hello, I am b1."
b2.speak(); // alerts: "Hello, I am b2."

Object.create() polyfill: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create#Polyfill