tap

with tap you can perform side-effects when source emits, errors or completes

Open browser console to see the output

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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()'));

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See tap vs finalize comparison