OOP in JavaScript

oop.js

// Prototypical Model

var UserPrototype = {};
UserPrototype.constructor = function(name)
{
    this._name = name;
};
UserPrototype.getName = function()
{
    return this._name;
};

var user = Object.create(UserPrototype);
user.constructor('Joe Bloggs');
console.log('user = ' + user.getName());

var AdminPrototype = Object.create(UserPrototype);
AdminPrototype.getName = function()
{
    return UserPrototype.getName.call(this) + ' [Admin]';
};

var admin = Object.create(AdminPrototype);
admin.constructor('Sally Ann');
console.log('admin = ' + admin.getName());

// Classical Model

function User(name)
{
    this._name = name;
}
User.prototype.getName = function()
{
    return this._name;
}

var user = new User('Joe Bloggs')
console.log('user = ' + user.getName());

function Admin(name)
{
    User.call(this, name);

    var secret = 'Hello';

    this.getSecret = function(password)
    {
        return (password === 'cheese')
            ? secret
            : 'It\'s a secret!';
    }
}
Admin.prototype = Object.create(User.prototype);
// Admin.prototype = new User();
Admin.prototype.constructor = Admin;
Admin.prototype.getName = function()
{
    return User.prototype.getName.call(this) + ' [Admin]';
};

var admin = new Admin('Sally Ann');
console.log('admin = ' + admin.getName());
console.log('secret = ' + admin.getSecret('cheese'));

function Student(properties)
{
    var $this = this;

    for (var i in properties) {
        (function(i)
        {
            $this['get' + i] = function()
            {
                return properties[i];
            }
        }(i));
    }
}

var student = new Student({
    Name: 'Joe Bloggs',
    Age: 24
});
console.log(student.getName());
console.log(student.getAge());