[JS] Wzorzec dekorator

console.clear();
var cl = function(text){ console.log(text); }

function Sale(price){
	this.price = price || 100;
}

Sale.prototype.getPrice = function(){
	return this.price;
}

Sale.decorators = {};
Sale.decorators.fedtax = {
	getPrice: function(){
		var price = this.uber.getPrice();
		price += price * 5/100;
		return price;
	}
}

Sale.decorators.quebec = {
	getPrice: function(){
		var price = this.uber.getPrice();
		price += price * 7/100;
		return price;
	}
}

Sale.decorators.money = {
	getPrice: function(){
		return "USD" + this.uber.getPrice().toFixed(2);
	}
}

Sale.prototype.decorate = function(decorator){
	var F = function(){},
	    i,
	    newObj,
	    overrides = this.constructor.decorators[decorator];

	F.prototype = this;
	newObj = new F();
	newObj.uber = F.prototype;
	for (i in overrides){
		if (overrides.hasOwnProperty(i)){
			newObj[i] = overrides[i];
		}
	}
	return newObj;
}


var sale = new Sale(100);
sale = sale.decorate("fedtax");
sale = sale.decorate("quebec");
sale = sale.decorate("money");
sale.getPrice();