with tap
you can perform side-effects when source emits, errors or completes
Open browser console to see the output
const { rxObserver } = require('api/v0.3');const { timer } = require('rxjs');const { tap, take } = require('rxjs/operators');timer(0, 5).pipe(take(10),tap(v => console.log('tap', v))).subscribe(rxObserver('tap()'));
See tap vs finalize comparison