JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/5.0.1/Rx.js"></script>

JavaScript

Rx.Observable.forkJoin(
	Rx.Observable.of('hello').delay(2000),
  Rx.Observable.of('world').delay(1000)
)
	.subscribe(console.log)