const isAnySuccessfulAttempt$: Observable<boolean> = this._quizService.isAnySuccessfulAttempt$().pipe(
  tap((isAnySuccessfulAttempt: boolean) => {
    this.isAnySuccessfulAttempt = isAnySuccessfulAttempt;
  }),
);

const isAnySuccessfulAttempt$: Observable<
  boolean
> = this._quizService.isAnySuccessfulAttempt$().pipe(
  tap((isAnySuccessfulAttempt: boolean) => {
    this.isAnySuccessfulAttempt = isAnySuccessfulAttempt;
  })
);

const isAnySuccessfulAttempt$: Observable<boolean> = 
  this._quizService.isAnySuccessfulAttempt$().pipe(
    tap((isAnySuccessfulAttempt: boolean) => {
      this.isAnySuccessfulAttempt = isAnySuccessfulAttempt;
    })
  );