from

RxJS 5 from

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/6.2.1/rxjs.umd.js"></script>
<script src="https://rawgit.com/eu81273/jsfiddle-console/master/console.js"></script>

JavaScript

//emit every 1s
const source$ = rxjs.interval(1000);
//skip emitted values from source while value is less than 5
const example$ = source$.pipe(rxjs.operators.skipWhile(val => val < 5))

//output: 5...6...7...8........
const subscribe = example$.subscribe(val => console.log(val))