Turn a Failing Website into an A+ Progressive Web Application

I will be adding content to this blog on Github using markdown:

import { Observable } from 'rxjs';

const observable = new Observable(subscriber => {
  subscriber.next(1);
  subscriber.next(2);
  subscriber.next(3);
  setTimeout(() => {
    subscriber.next(4);
    subscriber.complete();
  }, 1000);
});

Pull versus Push

Pull and Push are two different protocols that describe how a data Producer can communicate with a data Consumer.

What is Pull? In Pull systems, the Consumer determines when it receives data from the data Producer. The Producer itself is unaware of when the data will be delivered to the Consumer.