swift. Type matching - 2. Type별

Type matching의 두번째입니다.

각 데이터 타입별로 값을 비교하는 방법입니다.

// Tuples
 
let point = CGPoint(x: 7, y: 0)
switch (point.x, point.y) {
case (0,0): print("On the origin!")
case (0,_): print("x=0: on Y-axis!")
case (_,0): print("y=0: on X-axis!")
case (let x, let y) where x == y: print("On y=x")
default: print("Quite a random point here.")
}
 
// Char, String의 경우
 
let char: Character = "J"
switch char {
case "A", "E", "I", "O", "U", "Y": print("Vowel")
default: print("Consonant")
}
 
let str = "A"
switch str {
case "A", "E", "I", "O", "U", "Y": print("Vowel")
default: print("Consonant")
}
 
// Ranges
 
let count = 7
switch count {
case Int.min..<0: print("Negative count, really?")
case 0: print("Nothing")
case 1: print("One")
case 2..<5: print("A few")
case 5..<10: print("Some")
default: print("Many")
}
 
// lamda의 function 대입
 
func charType(_ car: Character) -> String {
    switch car {
    case "A", "E", "I", "O", "U", "Y", "a", "e", "i", "o", "u", "y":
        return "Vowel"
    case "A"..."Z", "a"..."z":
        return "Consonant"
    default:
        return "Other"
    }
}
print("Jules Verne".characters.map(charType))
// ["Consonant", "Vowel", "Consonant", "Vowel", "Consonant", "Other", "Consonant", "Vowel", "Consonant", "Consonant", "Vowel"]
 
// Array의 protocol type을
protocol Titleable {
    var title: String { get }
}
struct Book: Titleable {
    let title: String
    let author: String
    let year: Int
}
struct Movie: Titleable {
    let title: String
    let director: String
    let year: Int
}
struct WebSite: Titleable {
    let url: NSURL
    let title: String
}
 
// And an array of Media to switch onto
let media: [Titleable] = [
    Book(title: "20,000 leagues under the sea", author: "Jules Verne", year: 1870),
    Movie(title: "20,000 leagues under the sea", director: "Richard Fleischer", year: 1955)
]
 
for element in media {
    switch element {
    case let book as Book:
        print("book = \(book)")
    case let movie as Movie:
        print("movie = \(movie)")
    case is WebSite:
        print("website")
    default:
        print("element = \(element)")
    }
}