agoiabel

func dayType(for day: String) -> String {
  switch day {
    case: "Saturday", "Sunday": return "Weekend"
    case: "Monday", "Tuesday", "Wednessday", "Thursday", "Friday": return "Weekday"
    default: return "This is not a valid date"
  }
}

let result1 = dayType(for: "Sunday") //will return "Weekend"

agoiabel

enum Day {
  case Sunday
  case Monday
  case Tuesday
  case Wednessday
  case Thursday
  case Friday
  case Saturday
}

agoiabel

/** Rewriting the date type function */

func dayType(for day: Day) {
  switch day {
    case .Saturday, .Sunday: 
      return "Weekend"
    case .Monday, .Tuesday, .Wednessday, .Thursday, .Friday 
      return "Weekday"
  }
}

agoiabel

// You can also map to strings
enum Week: String {
    case Sunday = "Weekday"
    case Monday = "Weekday"
    case Tuesday = "Weekday"
    case Wednessday = "Weekday"
    case Thursday = "Weekday"
    case Friday = "Weekend"
    case Saturday = "Weekend"

agoiabel

/** associate without labels */
enum Trade {
  case Buy(String, amount)
  case Sell(String, Int)
}

Trade.Buy("Firstbank PLC", 300)
Trade.Sell("Firstbank PLC", 700)

/** associate with labels */

agoiabel

enum AppleDevice {
  case iPad
  case iPhone
  case AppleTv
  case AppleWatch
  
  func description() -> String {
    return "This is an apple device"
  }
}

agoiabel

enum AppleDevice {
    case iPad, iPhone, AppleTv, AppleWatch
    
    func description() -> String {
        switch self {
        case .iPad: return "\(self) was introduced 2006"
        case .iPhone: return "\(self) was introduced 2007"
        case .AppleTv: return "\(self) was introduced 2010"
        case .AppleWatch: return "\(self) was introduced 2014"
        }

agoiabel

class Street {
    var streetName: String?
}
class House {
    var noOfRooms = 1
    var street: Street?
}
class Person {
    var house: House?
}

agoiabel

if let myHouse = Person.house, let myStreet = myHouse.street {
      print(myStreet) //this will access the street
}

agoiabel

//if the Person.house fails, it wil not get to the street
//which can either return a null or the street

let myStreet = Person.house?.street

//to make sure we get a value, we can include the if let like below
if let myStreet = Person.house?.street {
  print(myStreet)
}