vialyx

struct Payment {
     
     var amount: Float
     var comission: Float
  
     var totalAmount: Float {
          return amount + comission
     }
  
}

vialyx

struct Pin {
     
     var value: String {
          willSet {
               print("new pin value: \(newValue)")
          }
          didSet {
               print("old pint value: \(oldValue)")
          }
     }

vialyx

struct PropertyStruct {
  
     static var storedTypeProperty = "1"
     static var computedTypeProperty: Double {
          return 10.0
     }
  
}

print("struct type property: \(PropertyStruct.storedTypeProperty)")

vialyx

class Player {
  
  var playing: Bool = false
  
  func play() {
       playing = true
  }
  
  func stop() {
       playing = false

vialyx

struct NameComponents {
  
     var firstName: String
     var lastName: String
  
     mutating func change(firstName: String, lastName: String) {
          self.firstName = firstName
          self.lastName = lastName
     }
  

vialyx

struct PropertyStructM {
  
     static func typeMethod() {
          // Code
     }
  
}

PropertyStructM.typeMethod()

vialyx

// PUT code into playground
var globalVariable = "globalString"

func fly() {
     var localVariable = "localString"
}

struct Airplane {
     // Local Variable
     var number: String

vialyx

class VideoPlayer: Player {
  
     var file: String
     var width: Int
     var height: Int
  
}

vialyx

class AudioPlayer: Player {
  
     // Overriding Property Observers
     override var playing: Bool {
          didSet {
               print("\(self) did set playing")
          }
     }
  
     // Overriding Methods

vialyx

class Setting: NSObject {
    
    enum State {
        case off, on
    }
    
    enum Action {
        case setup, open
    }