kuukaix https://blog.hatena.ne.jp/kuukaix/ kuukaixの日記 https://kuukaix.hatenablog.com/ Swift /* プロトコルと拡張 */ protocol ExampleProtocol { var simpleDescription: String { get } mutating func adjust() } extension Int: ExampleProtocol { var simpleDescription: String { return "The number \(self)" } mutating func adjust() { self += 42 } } print("7.simpleDescription = \(7.simpleDescription)") var n … 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkuukaix.hatenablog.com%2Fentry%2F2021%2F02%2F27%2F071042" title="プロトコルと拡張 - kuukaixの日記" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2021-02-27 07:10:42 rich https://kuukaix.hatenablog.com/entry/2021/02/27/071042 1.0 100%