Objective JS?

gistfile1.js

(function(){
	var TestType = function(num){
		var target = {},
		internal = {num10 : num * 10};

		target.firstProp = internal.num10.toString();
		target.firstMethod = function(){ console.log("The first method: " + target.firstProp); };

		return target;
	},
	Test2Type = function(num, age){
		var target = new TestType(num);

		target.firstProp = num + age;
		target.secondMethod = function(){ console.log("Just the second method"); };

		return target;
	};

	new TestType(10).firstMethod();
	new Test2Type(10, 15).firstMethod();
	new Test2Type(10, 15).secondMethod();
})();

Somewhat confused...