creatingSimleObserver.js

import { Observable } from 'rxjs';

var randomNumberGenerator = Observable.create(function(observer) {
  observer.next(Math.floor(Math.random() * 100));
  observer.next(Math.floor(Math.random() * 100));
  observer.next(Math.floor(Math.random() * 100));
  observer.next(Math.floor(Math.random() * 100));
  observer.next(Math.floor(Math.random() * 100));
  observer.next(Math.floor(Math.random() * 100));
  observer.next(Math.floor(Math.random() * 100));
});