factory.js

function CarFactory (){}

CarFactory.prototype.drive = function(){
	console.log(`i have ${this.doors} doors`);
}

CarFactory.make = function(type){  
	if(typeof CarFactory[type] !== "function" ){
  	throw Error("Car not found");
  }
	
  CarFactory[type].prototype = new CarFactory();
 	return new CarFactory[type]();  
}

CarFactory.Compact = function () {
  this.doors = 4;
};
CarFactory.Convertible = function () {
  this.doors = 2;
};
CarFactory.SUV = function () {
  this.doors = 24;
};

const test1 = CarFactory.make("Convertible");
const test2 = CarFactory.make("Compact")

test1.drive();
test2.drive();