التعدادات (Enums)

enum Direction {
    case up, down, left, right
}

let d = Direction.up
switch d {
case .up: print("للأعلى")
default: print("اتجاه آخر")
}

enum Planet: Int {
    case mercury = 1, venus, earth   // 1, 2, 3
}
print(Planet.earth.rawValue)        // 3
let p = Planet(rawValue: 1)         // Optional(.mercury)

enum Result {
    case success(String)
    case failure(Int)
}

let r = Result.success("تمّ")
switch r {
case .success(let msg): print(msg)
case .failure(let code): print("خطأ \(code)")
}

enum Light {
    case red, green
    func action() -> String {
        switch self {
        case .red: return "قف"
        case .green: return "سر"
        }
    }
}