Javascript new with apply

factory.js

var Adder = function Adder() {
	console.log(arguments);
	this.list = Array.prototype.slice.apply(arguments);
};

Adder.prototype.sum = function sum() {
	var sum = 0;
	this.list.forEach(function(x) {
		sum += x;
	});
	return sum;
};

var l = new Adder(1,2,3);
console.log(l.sum());	// 6

var numbers = [1,2,3];
l = new (Function.prototype.bind.apply(Adder, numbers));
console.log(l.sum()); // 5 ??

// Correct solution
// 
// http://stackoverflow.com/a/1608546/388351
var construct = function construct(constructor, args) {
	function F() {
	 	return constructor.apply(this, args);
 	}

	F.prototype = constructor.prototype;
 	return new F();
};

l = construct(Adder, numbers);
console.log(l.sum()); // 6