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Using take(1) with an Observable<boolean>?


By : user2174436
Date : October 18 2020, 08:10 AM
around this issue Yes it will take only once its kinda the same as reading snapshot.
In this case of canActivate its a question if you need it since you are NOT subscribing, so angular will handle freeing resources since you are returning observable. So I would not use take in this case
code :


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RxJava: Know when observable is finished and return Boolean Observable to the caller


By : kmaslov
Date : March 29 2020, 07:55 AM
wish of those help If I have understood your question correctly, then this is what you are searching:
code :

    client.authenticateWithClientCredentials()
          .map(token -> {
              // save `token` into cache
              return token;
          })
          .flatMap(integer -> Observable.just(Boolean.TRUE))
          .subscribe(aBoolean -> {
              // success
          }, throwable -> {
              // error
          });

    client.authenticateWithClientCredentials()
          .flatMapCompletable(integer -> {
              // save `token` into cache
              return Completable.complete();
          })
          .subscribe(() -> {
              // success
          }, throwable -> {
              // error
          });

Return an Observable<boolean> instead of Observable<HttpResponse> for HttpClient.post


By : aumanpj
Date : March 29 2020, 07:55 AM
I hope this helps you . How can I return an Observable in my method instead of the Observable>? , Use the map operator and return the observable.
code :
login(username: string, password: string) {
  const body = {username: username, password: password};
  return this.http.post<AuthResponse>(`${this.baseUrl}`, body, { observe: 'response' }).map(response => {
    const user = response.body;
    if (user && user.token) {
       localStorage.setItem(this.localStorageKey, JSON.stringify(user));
      return true;
    }

    localStorage.removeItem(this.localStorageKey);
    return false;
  });
}

CanActivate: Converting Observable<Observable<boolean>> to Observable<boolean>


By : RECEPTORES AZ
Date : March 29 2020, 07:55 AM
To fix the issue you can do Use .switchMap in order to flatten the observable. Read about it more here: https://www.learnrxjs.io/operators/transformation/switchmap.html
Essentially if you chain .switchMap to a source observable and an inner observable is returned, that observable will be subscribed to and its value emitted rather than the observable itself being emitted:
code :
return this.userService.authState().switchMap(auth => {
return this.userService.authState().switchMap(auth =>
  this.userService.getByUid(auth.uid)
).map(user => user.username === username);

RXJS - Angular : Two Observable<booleans> should return Observable<boolean>


By : Mike
Date : March 29 2020, 07:55 AM
wish of those help I think you could use forkJoin here and you'll need to map these two observables into one value using map operator.
code :
forkJoin([observable1, observable2]).pipe(
    map(([bool1, bool2]) => {
        return bool1 & bool2;
    })
);

Route guard: how to transform Observable<Response> into Observable<boolean>


By : tudor789 tudor789
Date : March 29 2020, 07:55 AM
I hope this helps . You can create another observable, which returns the desired data. For ex.:
code :
testFunction(): Observable<Boolean> {
  return Observable.create(observer => {
    this.http
    .get('http://example.com', { withCredentials: true})
    .map((res:Response) => { observer.next(res.status == 200); });
  });
}
testFunction().subscribe(result => {
  // here is the result
});
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