windowWhen

signature: windowWhen(closingSelector: function(): Observable): Observable

Close window at provided time frame emitting observable of collected values from source.

Examples

Example 1: Open and close window at interval

( jsBin | jsFiddle )

import { timer } from 'rxjs/observable/timer';
import { interval } from 'rxjs/observable/interval';
import { windowWhen, tap, mergeAll } from 'rxjs/operators';

//emit immediately then every 1s
const source = timer(0, 1000);
const example = source.pipe(
  //close window every 5s and emit observable of collected values from source
  windowWhen(val => interval(5000)),
  tap(_ => console.log('NEW WINDOW!'))
);

const subscribeTwo = example.pipe(
  //window emits nested observable
  mergeAll()
  /*
  output:
  "NEW WINDOW!"
  0
  1
  2
  3
  4
  "NEW WINDOW!"
  5
  6
  7
  8
  9
*/
  .subscribe(val => console.log(val));

Additional Resources


:file_folder: Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/patching/operator/windowWhen.ts

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