如果响应为空，如何调用函数

Question

如果响应为空，我如何调用 openSnackbar 函数但 return 如果响应不为空，我如何调用 LoadUserSuccess。我似乎找不到有效的解决方案。

  @Effect()
  validateOtp$: Observable<Action> = this.actions$.pipe(
    ofType<otpActions.Otp>(otpActions.OTP),
    switchMap((action) => {
      return this.otpService.validateOtp(action.payload).pipe(
        map(
          (response) => new userActions.LoadUserSucess(response)

          // this.openSnackBar()
        )
      );
    })
  );

  openSnackBar() {
    this.snackBar.open('Code invalid / expired', 'Close', {
      duration: 3500,
    });
  }

Answer 1

只需按照以下示例操作即可：

validateOtp$: Observable <Action> = this.actions$.pipe(
    ofType<otpActions.Otp>(otpActions.OTP),
    switchMap((action) => {
        return this.otpService.validateOtp(action.payload).pipe(
            tap(x => !x && this.openSnackBar()),
            filter(x => !!x),
            map(x => new userActions.LoadUserSucess(x))
        );
    })
);

如果响应为空，如何调用函数

How can I call a function if response is empty

rxjs

ngrx-effects

angular