How to properly unsubscribe from subscriptions in Angular?

Question

Angular

Do I need to unsubscribe from a subscription to a subscription? Or can you get away with the 1st unsubscribe?

this.authService.getUuid()
      .pipe(untilDestroyed(this)) // 1-я отписка
      .subscribe(phraseFromServer => {
        this.authService.sendPhraseToPlugin()
          .pipe(untilDestroyed(this)) // 2-я отписка
          .subscribe(signedCert => {
          this.signedCert = signedCert;
        }
      }

Answer 1

Better like this:

this.authService.getUuid().pipe(
  switchMap(phraseFromServer => this.authService.sendPhraseToPlugin()),
  untilDestroyed(this),
).subscribe(signedCert => {
  this.signedCert = signedCert;
})