?
?
var str = "Hello, playground"
?
// https://docs.swift.org/swift-book/LanguageGuide/Extensions.html
// Extensions can add new subscripts to an existing type.
?
enum Inning: Int {
? ? case first = 1, second, third, fourth, fifth, sixth, seventh, eighth, ninth
? ? // using a Instance Subscript
? ? subscript(n: Int) -> Inning {
? ? ? ? return Inning(rawValue: n)!
? ? }
}
?
//let current = Inning[1]
let inning = Inning(rawValue: 1)!
let current = inning[8]
print("\(current) inning")
?
?
// Better technique
enum Inning2: Int {
? ? case first = 1, second, third, fourth, fifth, sixth, seventh, eighth, ninth
? ? // using a Type Subscript
? ? static subscript(n: Int) -> Inning2 {
? ? ? ? return Inning2(rawValue: n)!
? ? }
}
?
let current2 = Inning2[1]
print("\(current2) inning")
?
?
?
// Type Subscript from https://docs.swift.org/swift-book/LanguageGuide/Subscripts.html
enum Planet: Int {
? ? case mercury = 1, venus, earth, mars, jupiter, saturn, uranus, neptune
? ? static subscript(n: Int) -> Planet {
? ? ? ? return Planet(rawValue: n)!
? ? }
}
?
let home = Planet[3]
print(home)
?
David Koontz