gistfile1.scala

object OptionGolf {
  import scalaz._
  import Scalaz._

  val moviel = Map("title" -> "South Park",
		  "user" -> "Terrence",
		  "rating" -> "3")

  val incompleteMovie = Map("name" -> "Jaws")

  case class MovieReview(revTitle: String, revUser: String, revReview: String)

  /*
   * Channing Walton's solution
   */
  def rev3(movie: Map[String,String]): Option[MovieReview] =
    movie.get("title") <*> (movie.get("user") <*> (movie.get("rating") ∘ MovieReview.curried))

  /*
   * Slightly different solution!
   */
  def rev4(movie: Map[String,String]) =
    (movie.get("title") <|**|> (movie.get("user"), movie.get("rating"))) ∘ MovieReview.tupled

  def main(args: Array[String]) {
    println(rev4(moviel))
    println(rev4(incompleteMovie))
  }