{"blog_title":"kuukaix\u306e\u65e5\u8a18","provider_name":"Hatena Blog","height":"190","categories":["Swift"],"author_url":"https://blog.hatena.ne.jp/kuukaix/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkuukaix.hatenablog.com%2Fentry%2F2021%2F02%2F24%2F205153\" title=\"NULL\u3082\u5165\u308b\u5909\u6570\u306e\u5ba3\u8a00 - kuukaix\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","type":"rich","description":"/* NULL\u3082\u5165\u308b\u5909\u6570\u306e\u5ba3\u8a00 */ var flag: Bool? var num: Int? if (flag == nil) { print(\"flag == NULL\") } // if (flag) { // error: value of optional type 'Bool?' must be unwrapped to a value of type 'Bool' if (flag ?? false) { print(\"flag == true\") } else { print(\"flag == false\") } flag = true if (flag ?? false) \u2026","blog_url":"https://kuukaix.hatenablog.com/","width":"100%","url":"https://kuukaix.hatenablog.com/entry/2021/02/24/205153","published":"2021-02-24 20:51:53","author_name":"kuukaix","version":"1.0","provider_url":"https://hatena.blog","image_url":null,"title":"NULL\u3082\u5165\u308b\u5909\u6570\u306e\u5ba3\u8a00"}