How to create playing cards and shuffling them in Swift 4.2

ShufflingPlayingCards-Swift4.2.swift

// CaseIterable gives us the allCases properties
enum Suit : CaseIterable {
  case clubs, hearts, diamonds, spades
}

// CaseIterable gives us the allCases properties
enum Rank : CaseIterable {
  case two, three, four, five, six, seven, eight, nine, ten, jack, queen, king, ace
}

struct PlayingCard {
  let suit: Suit
  let rank: Rank
  
  public static let all: [PlayingCard] = {
    // flatMap to give us a "flat" array of play cards
    return Suit.allCases.flatMap{ (suit) -> [PlayingCard] in
      return Rank.allCases.map({ (rank) -> PlayingCard in
        return PlayingCard(suit: suit, rank: rank)
      })
    }
  }()
}

// using shuffle from Array
let shuffled = PlayingCard.all.shuffled()