C-为什么我在这里遇到细分错误？

Question

this.manufacturer.valueChanges
  .pipe(
    filter((value: string) => (value ? value.length > 0 : false)),
    tap(() => (this.loadingAutocomplete = true)),
    debounceTime(500),
    switchMap(val =>
      this.frameService.getItems(val, "manufacturerAutocomplete").pipe(
        catchError(err => {
          handleError(err);
          this.loadingAutocomplete = false;
          return [];
        })
      )
    ),
    tap(() => (this.loadingAutocomplete = false))
  )
  .subscribe(
    manufacturers => {
      this.matchingManufacturers.next(manufacturers);
    },
    err => {
      this.loadingAutocomplete = false;
      this.matchingManufacturers.next([]);
    }
  );

我正在尝试将帧（char [6]）的源mac地址与数组的元素（每个元素是char [6] mac地址）进行比较，如果它在其中，则设置为是的。