a gist describing function inheritance using three kinds [new , .prototype , util.inherits(constructor , super constructor) ] .. and extending two child objects with [.call() and .apply()]

app.js

var util = require('util');

function Person(firstname, lastname) {
	this.firstname = firstname;
	this.lastname = lastname;
}

Person.prototype.greet = function() {
	console.log('Hello ' + this.firstname + ' ' + this.lastname);
	console.log('badge number:'+this.badgenumber);
};

function Policeman() {
	Person.call(this, 'peter' , 'policeman');
	this.badgenumber = '1234';
} 
function colonel() {
	Person.apply(this, ['peter', 'colonel']);
	this.badgenumber = '9999';
}

util.inherits(Policeman, Person);
util.inherits(colonel, Person);
var officer = new Policeman();
var officer2 = new colonel();
officer.greet();
officer2.greet();

officer._proto_._proto_ = greet() // a prototype of a prototype