What is Tap Operator - RXJS

In this tutorial, we will learn about the Tap Operator of RXJS.

What is Tap Operator?

The tap Operator is a Utility Operator which is very similar to a helper function,  

Perform a side effect for every emission on the source Observable, but return an Observable that is identical to the source.

The tap operator allows you to perform actions or side effects on an Observable stream without modifying or altering the original stream.

const arr = [1, 2, 3];

const fromArr$ = from(arr);

fromArr$
  .pipe(tap((value) => console.log("Received value: ", value)))
  .subscribe((value) => console.log(`Emitted Values: `, value));

Use of Tap Operator

1.Console log(data)

2. Change Property Value

3. Emit Value in Observable

4. Perform Any Other Action

Instead of doing other like unsubscribing in map better to do it in tap