ã¯ããã« Swiftã®Optionalã«ã¤ãã¦ããããªèªèãããã¾ããã Int? 㯠Int ãå ¥ããããããªããnilãå ¥ããããããªãå ããã ãã®èªèã§ãSwiftã®ããã°ã©ãã³ã°ã¯ååå¯è½ã ã¨æãã¾ãã Optional BindingãOptional Chainingã使ãããªããã°ãOptionalã¨åé以ä¸æ人æªæºã®é¢ä¿ã«ãªã£ãã¨è¨ã£ã¦ããã§ãããã ãã ãããã ãã§ã¯æºè¶³ããããªãããã£ã¨Optionalã®ãã¨ãç¥ãããï¼æ人以ä¸ã®é¢ä¿ã«ãªãããï¼ã¨æãããã«ãªã£ã¦ãã¾ããã Optionalã®å®ç¾© Optionalã®å®ç¾©ã確èªãã¦ã¿ã¾ããï¼ããããçãã¦ãã¾ãã public enum Optional<Wrapped> { case None case Some(Wrapped) } ãã®æç¹ã§Optionalã®èªèãå°ãæ¹ã¾ãã¾ãã Int? 㯠Some(Int
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