Chain of Responsibility

class Approver {  constructor() {    this.next = null;  }   handle(request) {    if (this.canApprove(request)) {      this.approve(request);      return;    }    if (this.next !== null) {      this.next.handle(request);    }  }} class Manager extends Approver {  canApprove(request) {    return request.amount <= 1000;  }} class Director extends Approver {  canApprove(request) {    return request.amount <= 10000;  }} class Board extends Approver {  canApprove(request) {    return true;  }} const manager = new Manager();manager.next = new Director();manager.next.next = new Board(); manager.handle({ amount: 500 });manager.handle({ amount: 8000 });manager.handle({ amount: 200000 });