The [jTypes](http://www.jtypes.com/) front-page example, formatted for visualizing on [Object Playground](http://www.objectplayground.com/).

jTypes-Object-Playground

/*! ------------------------------------------------------------------------
//                                jTypes 2.1.1
//  ------------------------------------------------------------------------
//
//                   Copyright 2013 Gaulinsoft Corporation
//
//       Licensed under the Apache License, Version 2.0 (the "License");
//      you may not use this file except in compliance with the License.
//                   You may obtain a copy of the License at
//
//                 http://www.apache.org/licenses/LICENSE-2.0
//
//     Unless required by applicable law or agreed to in writing, software
//      distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//     See the License for the specific language governing permissions and
//                       limitations under the License.
*/
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{});

var Person = $$(function($fName, $lName, $age)
{
    this.firstName = $fName;
    this.lastName  = $lName;
 
    this._age = $age;
},
{
    'public readonly firstName': '',
    'public readonly lastName':  '',
 
    'protected _age': 0,
 
    'public getFullName': function()
    {
        return this.firstName + ' ' + this.lastName;
    },
 
    'public virtual triggerOneYearOlder': function()
    {
        this._age++;
    },
 
    'public age':
    {
        'get': function()
        {
            return this._age;
        },
        'set': function($v)
        {
            if ($v > 0)
                this._age = $v;
        }
    }
});

var Employee = $$(Person, function($fName, $lName, $age, $salary)
{
    this.__base($fName, $lName, $age);
    
    this._salary = $salary;
},
{
    'protected _salary': 0,
 
    'public override triggerOneYearOlder': function()
    {
        this.__base.triggerOneYearOlder();
 
        this._salary *= 1.03;
    },
 
    'public salary':
    {
        'get': function()
        {
            return this._salary;
        }
    }
});

var p = new Person('John', 'Doe', 30);
var e = new Employee(p.firstName, p.lastName, p.age, 75000);

this.p = p;
this.e = e;