Swift - 대소문자 바꾸기 (아스키코드, map) 2가지 방법

func solution(_ my_string:String) -> String {
    return my_string.map { $0.isUppercase ? $0.lowercased() : $0.uppercased() }.joined()
}

func solution(_ my_string:String) -> String {
    var arr: String = ""
    for i in my_string {
        if i.asciiValue! > 96 {
            arr.append(Character(UnicodeScalar(i.asciiValue! - 32)))
        } else {
            arr.append(Character(UnicodeScalar(i.asciiValue! + 32)))
        }
    }
    return arr.description
}