vialyx

struct Car {
     let vin: String
     var number: String?
}

var newCar = Car(vin: "ZNA123051252OK", number: nil)
newCar.number = "4440PX7"
// Error, vin is constant
// newCar.vin = ""

vialyx

let existedUser = User()
let adminUser = User()
let superUser = existedUser

if existedUser === adminUser {
    print("existedUser, adminUser both refer to same instance")
}

if existedUser === superUser {
    print("existedUser, superUser both refer to same instance")

vialyx

class User {
     var name: String?
     var source: String?
}

let guest = User()
guest.source = "Facebook"

let newUser = guest
newUser.name = "Medusa"

vialyx

let speedCamFine = Fine(id: UUID().uuidString, date: Date(), number: "104520", amount: NSNumber(value: 12.5))
var highSpeedFine = speedCamFine
highSpeedFine.id = UUID().uuidString
highSpeedFine.number = "708908"

print("speedCamFine number: \(speedCamFine.number)")
print("highSpeedFine number: \(highSpeedFine.number)")

vialyx

let newFine = Fine(id: UUID().uuidString, date: Date(), number: "104520", amount: NSNumber(value: 12.5))

vialyx

print("fine id: \(fine.id)")

iabService.loadProducts()

vialyx

let fine = Fine()
let iabService = IAPService()

vialyx

struct Fine {
    
    var id: String = UUID().uuidString
    var date: Date? = Date()
    var number: String = ""
    var amount: NSNumber = NSNumber(value: 0.0)
    
}

typealias IAPServiceRetriveResult = () -> Void

vialyx

struct YourStructure {
  // Definition
}
class YourClass {
  // Definition
}

vialyx

    func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool {
        if let shortcut = Shortcuts(rawValue: userActivity.activityType) {
            NotificationCenter.default.post(name: shortcut.notification, object: userActivity)
        }
        
        return true
    }