Example 1: Open and close window at interval
( StackBlitz | jsBin | jsFiddle )
// RxJS v6+import { interval, timer } from 'rxjs';import { windowWhen, tap, mergeAll } from 'rxjs/operators';//emit immediately then every 1sconst source = timer(0, 1000);const example = source.pipe(//close window every 5s and emit observable of collected values from sourcewindowWhen(() => interval(5000)),tap(_ => console.log('NEW WINDOW!')));const subscribeTwo = example.pipe(//window emits nested observablemergeAll()/*output:"NEW WINDOW!"01234"NEW WINDOW!"56789*/).subscribe(val => console.log(val));
windowWhen 📰 - Official docs
📁 Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/windowWhen.ts