decorator11.md

class ListingProcessor[F[_]: Monad](transform: RawListing => FullListing, 
                       save: Sink[F, Seq[FullListing]]) {

    def process(listings: Seq[RawListing]): F[Unit] = {
      val fullListings = listings.map(transform) 
      // ...logic, etc
      save(fullListings)
    }
}