pattern-example.js

var Human = function (name, age) {
	return {
		init: function () {
			this.setName(name);
			this.setAge(age);
		},

		setName: function (name) {
			this.setName = name;
		},

		setAge: function (age) {
			this.setAge = age;
		}
	}
}

var einstein = new Human('Albert Einstein', 40);
einstein.init();

Human.getName = function () {
	return this.name;
}

Human.prototype.getAge = function () {
	return this.age;
}

console.log(einstein.getName()); //throws an error
console.log(einstein.getAge());  //throws an error

////////////////////////////////////////////////

var Nazgul = function (name, age) {
	this.init(name, age);
}

Nazgul.prototype.init = function (name, age) {
	this.setName(name);
	this.setAge(age);
}

Nazgul.prototype.setName = function (name) {
	this.name = name;
}

Nazgul.prototype.setAge = function (age) {
	this.age = age;
}

var witchKing = new Nazgul('Witch King', 500);

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

console.log(witchKing.getName()); //Witch King