working_with_streams.dart

  blocLocation = BlocLocation();
    blocLocation.locations
      .debounce(Duration(milliseconds: 500))
      .where((locationData) => true)
      .transform(combineLatest(filter, (a, b) => LFData(a, b)))
      .asyncMap((data) => _getPins(
        categoryId: data.filter.categoryIds[0],
        lat: data.location.latitude,
        lon: data.location.longitude,
        radius: data.filter.radius,
        rating: data.filter.rating,
      ))
      .listen((pins) => _screenMap.add(pins));