swift 枚举の実験1

Posted 2021-05-19

//: Playground - noun: a place where people can play

import Foundation

var str = "Hello, playground"

enum Planet_whoAreYou {
    case Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
    
    func next() -> Planet_whoAreYou {
        switch self {
        case .Mercury: return .Venus
        case .Venus: return .Earth
        case .Earth: return .Mars
        case .Mars: return .Jupiter
        case .Jupiter: return .Saturn
        case .Saturn: return .Uranus
        case .Uranus: return .Neptune
        case .Neptune: return .Mercury
        }
    }
    
    func prev() -> Planet_whoAreYou {
        switch self {
        case .Mercury: return .Neptune
        case .Venus: return .Mercury
        case .Earth: return .Venus
        case .Mars: return .Earth
        case .Jupiter: return .Mars
        case .Saturn: return .Jupiter
        case .Uranus: return .Saturn
        case .Neptune: return .Uranus
        }
    }
    
}

enum Planet_Int: Int {
    case Mercury = 1, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
}

enum Planet_String: String {
    case Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
}

let MAX = 1
let somebodyArray = Array<Planet_whoAreYou>(count:MAX, repeatedValue: .Earth)
let stringArray = Array<Planet_String>(count:MAX, repeatedValue: .Mercury)
let intArray = Array<Planet_Int>(count:MAX, repeatedValue: .Jupiter)

func toStringYYY(val:Planet_whoAreYou) -> String {
    return String(val)
}

for x in somebodyArray {
    
    print(x)
    // -> Earth
    print(x.next())
    // -> Mars
    
    switch String(x) {
    case "Mercury":print(x)
    default: break
    }
}

for x in stringArray {
    let strA = String(x)
    print(strA)
    // -> Mercury
    print(x)
    // -> Mercury
    print("\(x) = \(x.rawValue)")
    // -> Mercury
    
    switch x.rawValue {
    case "Mercury":print(x)
    default: break
    }
}

for x in intArray {
    print(String(x))
    // -> Jupiter
    //print(Int(x)) initializerはinvokeできない
    print("\(x) = \(x.rawValue)")
    // -> Jupiter = 5
    
    switch String(x) {
    case "Mercury":print(x)
    default: break
    }
}