Final Swift challenge Zephyz

ZephyzSubmission.swift

import Foundation

enum Suit {
    case Clubs, Diamonds, Hearts, Spades
}

enum Rank {
    case Jack, Queen, King, Ace
    case Num(Int)
}

struct Card {
    let suit: Suit
    let rank: Rank
}


//clearest solution I could come up with 11 lines
func countHand1(cards: [Card], previousCard: Card = Card(suit:Suit.Spades, rank:Rank.Num(0))) -> Int {
    if cards.isEmpty { return 0 }
    else {
        let fn : () -> Int = { return countHand(Array(dropFirst(cards)), previousCard: cards[0])}
        switch (previousCard.suit, previousCard.rank, cards[0].suit, cards[0].rank) {
        case (Suit.Diamonds, Rank.Num(5), _ , Rank.Ace)              : return 100 + fn()
        case (Suit.Hearts, _ , _ , Rank.Num(let a)) where a % 2 == 1 : return a*2 + fn()
        default: return fn()
        }
    }
}

I think you should rename your function to coundHand (without '1'), otherwise line 22 will result in a compiler error.