Simple Factory Method

class Transport {  deliver(shipment) { throw new Error('abstraktná metóda'); }} class Truck extends Transport {  deliver(shipment) {    // by road  }} class Ship extends Transport {  deliver(shipment) {    // by sea  }} class Drone extends Transport {  deliver(shipment) {    // by air  }} // The only place in the application that names the concrete classes.class TransportFactory {  static forRoute(route) {    if (route === 'road') return new Truck();    if (route === 'sea') return new Ship();    if (route === 'air') return new Drone();    throw new Error('unknown route: ' + route);  }} const a = TransportFactory.forRoute('road');const b = TransportFactory.forRoute('sea');const c = TransportFactory.forRoute('air'); a.deliver(shipment);   // the client wrote no new at all