Get the chain of internal prototypes for a given object

getPrototypeChainOf.js

function getPrototypeChainOf(obj){
  var chain = [];
	var __prototype__ = Object.getPrototypeOf(obj);
	//any protype chain ends in Object.prototype.__proto__, that is null
	while (__prototype__){
		chain.push(__prototype__);
		__prototype__ = Object.getPrototypeOf(__prototype__);
	}
	return chain;
}

//let's test it
function Animal(){}

function Person(){}
Person.prototype = new Animal();
Person.prototype.constructor = Person;

function Asturian(){}
Asturian.prototype = new Person();
Asturian.prototype.constructor = Asturian;


var items = [
	{}, 
	new Animal(),
	new Person(),
	new Asturian()
].forEach(function(item){
	console.log("prototype chain for instance of " + item.constructor.name + " type:\n"
	+ getPrototypeChainOf(item).map(function(item){ 
		return item.constructor.name;
	}).join(", "));
});