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var HelloWorld = Class.extend(function() { // default name of .extend() can be changed via constant
	this.greeting = 'Hello '; // public property

	var world = 'World!'; // private property

	this.constructor = function(greeting) { // default name of .constructor() can be changed via constant
		if (typeof greeting != 'undefined') {
			this.greeting = greeting;
		}
	};

	this.say = function() { // public method
		return privileged.call(this);
	};

	function privileged() { // private/privileged method
		return this.greeting + world;
	}
});

var helloWorld = new HelloWorld()
helloWorld.say() // 'Hello World!'
helloWorld instanceof HelloWorld // true

var hiWorld = new HelloWorld('Hi ')
hiWorld.say() // 'Hi World!'
hiWorld instanceof HelloWorld // true

function isNonEmptyString(value) {
	return typeof value == 'string' && value.length > 0;
}

var Base = Class.extend(function() {
	this.name = '';

	this.constructor = function(name) {
		this.name = name;
	};

	// check name
	this.isValid = function() {
		return isNonEmptyString(this.name);
	};
});


var Extended = Base.extend(function(parent) {
	this.address = '';

	this.constructor = function(name, address) {
		parent.constructor.call(this, name); // call parent constructor
		// could be also written as: this.name = name;

		this.address = address;
	};

	// check name and address
	this.isValid = function() {
		return parent.isValid.call(this) && isNonEmptyString(this.address);
		// could be also written as: return isNonEmptyString(this.name) && isNonEmptyString(this.address);
	};
});

var emptyExample = new Extended(null, null);
emptyExample.isValid() // false

var nameExample = new Extended('John', null);
nameExample.isValid() // false

var addressExample = new Extended(null, 'London');
addressExample.isValid() // false

var validExample = new Extended('John', 'London');
validExample.isValid() // true