swiftでfizzbuzz。 caseクラスぽいやつとタプルのパターンマッチと演算子オーバーロード使ってやりました。

fizzbuzz.swift

enum FizzBuzz{
    case None
    case Fizz
    case Buzz
    case FizzBuzz
    case Num(i : Int)
    
    func print(){
        switch self{
        case .Fizz:
            println("Fizz")
        case .Buzz:
            println("Buzz")
        case .FizzBuzz:
            println("FizzBuzz")
        case let Num(i):
            println(i)
        default:
            ()
        }
    }
}

@infix func + (left: FizzBuzz, right: FizzBuzz) -> FizzBuzz {
    switch (left, right){
        case let (.Fizz, .None):
            return .Fizz
        case let (.None, .Buzz):
            return .Buzz
        case let (.Fizz, .Buzz):
            return .FizzBuzz
        case let (.Fizz, .Num):
            return .Fizz
        case let (.Buzz, .Num):
            return .Buzz
        case let (.FizzBuzz, .Num):
            return .FizzBuzz
        case let (.None, .Num(i)):
            return .Num(i: i)
        default:
            return .None
    }
}

func fizz(i: Int) -> FizzBuzz {
    if i % 3 == 0 {
        return .Fizz
    }
    return .None
}
func buzz(i: Int) -> FizzBuzz {
    if i % 5 == 0 {
        return .Buzz
    }
    return .None
}
func num(i: Int) -> FizzBuzz {
    return .Num(i:i)
}

for i in 1...100{
    (fizz(i) + buzz(i) + num(i)).print()
}