🔥 Any와 AnyObject를 위한 타입 캐스팅

var things: [Any] = []
 
things.append(0)            // Int 값 추가
things.append(0.0)          // Double 값 추가
things.append(42)           // 또 다른 Int 값 추가
things.append(3.14159)      // 또 다른 Double 값 추가
things.append("hello")      // String 값 추가
things.append((3.0, 5.0))   // (Double, Double) 타입의 튜플 추가
things.append(Movie(name: "Ghostbusters", director: "Ivan Reitman"))  // Movie 인스턴스 추가
things.append({ (name: String) -> String in "Hello, \(name)" })        // String을 받아 String을 반환하는 클로저 추가
swift복사

for thing in things {
    switch thing {
    case 0 as Int:
        print("zero as an Int")
    case 0 as Double:
        print("zero as a Double")
    case let someInt as Int:
        print("an integer value of \(someInt)")
    case let someDouble as Double where someDouble > 0:
        print("a positive double value of \(someDouble)")
    case is Double:
        print("some other double value that I don't want to print")
    case let someString as String:
        print("a string value of \\"\(someString)\\"")
    case let (x, y) as (Double, Double):
        print("an (x, y) point at \(x), \(y)")
    case let movie as Movie:
        print("a movie called \(movie.name), dir. \(movie.director)")
    case let stringConverter as (String) -> String:
        print(stringConverter("Michael"))
    default:
        print("something else")
    }
}
 
// zero as an Int
// zero as a Double
// an integer value of 42
// a positive double value of 3.14159
// a string value of "hello"
// an (x, y) point at 3.0, 5.0
// a movie called Ghostbusters, dir. Ivan Reitman
// Hello, Michael
swift복사