CODEWITHSUNDEEP
angularrxjs
Lucas Tony
Lucas Tony

Reputation: 117

What role does .pipe(take(1)) have here?

What role does pipe(take(1)) have when calling the method from authService? 

this.authService
  .signIn(email, password)
  .pipe(take(1))
  .subscribe(...)

Upvotes: 4

Views: 5570

Answers (2)

Nicholas K
Nicholas K

Reputation: 15443

From the rxjs-docs:

Take returns an Observable that emits only the first count values emitted by the source Observable. If the source emits fewer than count values then all of its values are emitted. After that, it completes, regardless if the source completes.

Upvotes: 1

Kurt Hamilton
Kurt Hamilton

Reputation: 13515

take(1) will unsubscribe after 1 value has been received. This is useful for tidying up subscriptions to long running observables when you know you only want the first result.

Upvotes: 6

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