Swift - Class definition and hierarchy

class_hierarchy.swift

class NamedShape {
    var numberOfSides = 0
    var name: String

    init(name: String) {
       self.name = name
    }

    func simpleDescription() -> String {
       return "A shape with \(numberOfSides) sides."
    }
}

let namedShape = NamedShape(name: "my named shape")

class Square: NamedShape {
    var sideLength: Double

    init(sideLength: Double, name: String) {
        self.sideLength = sideLength
        super.init(name: name)
        numberOfSides = 4
    }

    func area() ->  Double {
        return sideLength * sideLength
    }

    override func simpleDescription() -> String {
        return "A square with sides of length \(sideLength)."
    }
}
let testSquare = Square(sideLength: 5.2, name: "my test square")
testSquare.area()
testSquare.simpleDescription()

enum.swift

enum Rank: Int {
    case Ace = 1
    case Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten
    case Jack, Queen, King
    func simpleDescription() -> String {
        switch self {
            case .Ace:
                return "ace"
            case .Jack:
                return "jack"
            case .Queen:
                return "queen"
            case .King:
                return "king"
            default:
                return String(self.rawValue)
        }
    }
}
let ace = Rank.Ace
let aceRawValue = ace.rawValue


struct Statuses {
  var inactive: Status
  var active: Status
  func toString() -> String {
    return "Statuses: \(inactive) and \(active)"
  }
}

let statuses = Statuses(inactive: .Inactive, active: .Active)
statuses.toString()

protocol.swift

protocol Person {
  var gender: String { get }
  func talkAboutMyself() -> String
}

class Male: Person {
  var name: String
  var gender: String = "male"
  
  init(name: String) {
    self.name = name
  }
  
  func talkAboutMyself() -> String {
    return "I'm a \(gender) named \(name)"
  }
}

let person = Male(name: "Tiago")
person.talkAboutMyself()