Scammy items

Problem

Our problem is almost solved. We know how to go from an item to a list of reviews, all we need is some simple logic to decide whether these reviews suggest something suspicious.

We can do something fiendishly clever, such as looking for occurrences of the word scam in their body.

def scammyReviews(reviews: List[Review]): Boolean =
  reviews.exists(r => r.body.contains("scam"))

At this point, all that remains is putting everything together. First, by implementing scammyItem, then scammyItemF.

I’ve laid out the type signatures of these functions here:

def scammyItem[F[_]](
  loadSeller: SellerId => F[Seller],
  loadReview: ReviewId => F[Review],
  item      : Item
): F[Boolean] =
  ???

def scammyItemF[F[_]](
  scammyItem: Item => F[Boolean],
  fitem     : F[Item]
): F[Boolean] =
  ???

Here’s the entire problem viewed as a diagram:

And now it’s your turn to do a little work. You have everything you need, let me know what you come up with!