Facade

class Warehouse {  reserve(item) {    // lowers the available quantity  }} class Payment {  charge(amount) {    // posts the amount  }} class Shipping {  schedule(address) {    // creates a shipment  }} // The facade knows the order of steps. The client does not have to.class OrderFacade {  constructor() {    this.warehouse = new Warehouse();    this.payment = new Payment();    this.shipping = new Shipping();  }   complete(order) {    this.warehouse.reserve(order.item);    this.payment.charge(order.amount);    this.shipping.schedule(order.address);  }} const facade = new OrderFacade();facade.complete(order);   // one call instead of three