kuukaix https://blog.hatena.ne.jp/kuukaix/ kuukaixの日記 https://kuukaix.hatenablog.com/ Swift /* 継承 */ class Vehicle { var numberOfWheels: Int? var maxPassengers: Int? init() { } func description() -> String { // return "numberOfWheels = \(numberOfWheels), maxPassengers = \(maxPassengers)" // warning: string interpolation produces a debug description for an optional value; did you mean to ma… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkuukaix.hatenablog.com%2Fentry%2F2021%2F02%2F27%2F071728" title="継承 - 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 07:17:28 rich https://kuukaix.hatenablog.com/entry/2021/02/27/071728 1.0 100%