103. 가위 바위 보

import Foundation

func solution(_ rsp:String) -> String {

    var answer : String = ""
    var arr : [String] = []

    arr = rsp.map{String($0)}

    for i in arr.indices{
        switch arr[i] {
            case "2" : answer += "0"
            case "0" : answer += "5"
            case "5" : answer += "2"
            default : answer = ""
        }
    }

    return answer
}

import Foundation

func solution(_ rsp:String) -> String {
    return rsp.map{$0 == "0" ? "5" : $0 == "2" ? "0" : "2"}.joined()
}