Swift extension #6 Nested Types

Nested Types

예

1. extension Int {
2. enum Kind {
3. case Negative, Zero, Positive
4. }
5. var kind: Kind {
6. switch self {
7. case 0:
8. return .Zero
9. case let x where x > 0:
10. return .Positive
11. default:
12. return .Negative
13. }
14. }
15. }

1. func printIntegerKinds(numbers: [Int]) {
2. for number in numbers {
3. switch number.kind {
4. case .Negative:
5. print("- ", appendNewline: false)
6. case .Zero:
7. print("0 ", appendNewline: false)
8. case .Positive:
9. print("+ ", appendNewline: false)
10. }
11. }
12. print("")
13. }
14. printIntegerKinds([3, 19, -27, 0, -6, 0, 7])
15. // prints "+ + - 0 - 0 +"