swift 在swift中使用枚举的高级应用程序

Posted 2021-05-19

//playground for experimenting with enums

enum pair {
    case First(Int)
    case Second(Int)
    //add to the first case
    mutating func addToFirst(amount:Int) {
        switch(self){
        case .First(let current):
            self = .First(current + amount)
        default: break
        }
    }
    //returns the value of the enum
    func getValue() -> Int {
        switch(self){
        case .First(let current):
            return current
        case .Second(let current):
            return current
        }
    }
    //computed property
    var string: String {
        switch(self){
        case .First(let current): return String(current)
        case .Second(let current): return String(current)
        }
    }
}



var f = pair.First(4)
f.addToFirst(4)
print(f.getValue())
f.string
//"8\n"