JohnSundell

protocol Randomizer {
    func randomNumber(upperBound: UInt32) -> UInt32
}

class DefaultRandomizer: Randomizer {
    func randomNumber(upperBound: UInt32) -> UInt32 {
        return arc4random_uniform(upperBound)
    }
}

JohnSundell

class CardGame {
    private let deck: Deck
    private let randomizer: Randomizer
    
    init(deck: Deck, randomizer: Randomizer = DefaultRandomizer()) {
        self.deck = deck
        self.randomizer = randomizer
    }
    
    func drawRandomCard() -> Card {

JohnSundell

extension User {
    func toJSON() -> [String : Any] {
        var json = [String : Any]()
        json["firstName"] = firstName
        json["lastName"] = lastName
        json["age"] = age
        json["friends"] = friends.map { $0.toJSON() }
        json["coworkers"] = coworkers.map { $0.toJSON() }
        json["favorites"] = favorites.map { $0.toJSON() }
        json["messages"] = messages.map { $0.toJSON() }

JohnSundell

extension User {
    func toJSON() -> [String : Any] 
        return [
            "firstName": firstName,
            "lastName": lastName,
            "age": age,
            "friends": friends.map { $0.toJSON() },
            "coworkers": coworkers.map { $0.toJSON() },
            "favorites": favorites.map { $0.toJSON() },
            "messages": messages.map { $0.toJSON() },

JohnSundell

extension IntegerConvertible {
    func add<T: IntegerConvertible>(_ number: T) -> CustomNumber {
        return CustomNumber(int: int + number.int)
    }
}

func addNumbers() -> CustomNumber {
    return CustomNumber(int: 1).add(CustomNumber(int: 2))
                               .add(CustomNumber(int: 3))
                               .add(CustomNumber(int: 4))

JohnSundell

func addNumbers() -> CustomNumber {
    return CustomNumber(int: 1) +
           CustomNumber(int: 2) +
           CustomNumber(int: 3) +
           CustomNumber(int: 4) +
           CustomNumber(int: 5)
}

JohnSundell

func +<A: IntegerConvertible, B: IntegerConvertible>(lhs: A, rhs: B) -> CustomNumber {
    return CustomNumber(int: lhs.int + rhs.int)
}

JohnSundell

startime=$(<buildtimes.log)
endtime=$(date +%s)
deltatime=$((endtime-startime))
newline=$'\n'
echo "[Start] $startime$newline[End] $endtime$newline[Delta] $deltatime" > "buildtimes.log"

JohnSundell

echo "$(date +%s)" > "buildtimes.log"

JohnSundell

class ModelLoader {
    func loadAllModels() -> AnySequence<Model> {
        return AnySequence { () -> AnyIterator<Model> in
            var index = 0
            
            return AnyIterator {
                let model = database.model(at: index)
                index += 1
                return model
            }