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Stringのenumの配列に優先順位をつけて優先度が一番高いものを取得する方法(Comparable使う)

Last updated at Posted at 2021-06-24

Comparable使えば良いよ

public enum Emoji: String, Comparable {
    
    case neko = "😺"
    case inu = "🐶"
    case usi = "🐮"
    
    var priority: Int {
        switch self {
        case .neko:
            return 0
        case .inu:
            return 1
        case .usi:
            return 2
        }
    }
    
    public static func <(_ lhs: Emoji, _ rhs: Emoji) -> Bool {
        return lhs.priority < rhs.priority
    }
}
let emojis: [Emoji] = [.neko, .inu, .usi, .inu]
let topPriorityEmoji = emojis.max()
topPriorityEmoji?.rawValue //"🐮"

Comparable使えば別にStringでなくてもいいし、enumでなくてもよい

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