if case let, if case let where

gistfile1.txt

//////////////////////////////////
enum Media {
  case book(title: String, author: String, year: Int)
  case movie(title: String, director: String, year: Int)
  case website(urlString: String)
}

let m = Media.movie(title: "Captain America: Civil War", director: "Russo Brothers", year: 2016)

if case let Media.movie(title, _, _) = m {
  print("This is a movie named \(title)")
}

switch m {
  case let Media.movie(title, _, _): print("This is a movie named \(title)")
  default: () // do nothing, but this is mandatory as all switch in Swift must be exhaustive
}

if case let Media.movie(_, _, year) = m, year < 1888 {
    print("Something seems wrong: the movie's year is before the first movie ever made.")
}