{"description":"Ruby \u30e9\u30a4\u30af\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e crystal \u306b\u3064\u3044\u3066\u52c9\u5f37\u3057\u3066\u307e\u3059\u3002\u4eca\u56de\u306f\u578b\u306e\u5224\u5b9a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3067\u3059\u3002 crystal \u3067 is_a? \u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3068\u3001\u578b\u306e\u5224\u5b9a\u304c\u884c\u3048\u307e\u3059\u3002 \u5b9f\u969b\u306b\u4f7f\u3046\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u3059\u3002\u30e6\u30cb\u30aa\u30f3\u578b\u306e\u5909\u6570\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3059\u3002 icr(0.33.0) > if 1 + 2 == 3 icr(0.33.0) > a = 1 icr(0.33.0) > else icr(0.33.0) > a = nil icr(0.33.0) > end => 1 icr(0.33.0) > typeof(a) => (Int32 | Nil) icr(0.33.0) > a =>\u2026","height":"190","author_url":"https://blog.hatena.ne.jp/a1026302/","blog_url":"https://a1026302.hatenablog.com/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fa1026302.hatenablog.com%2Fentry%2F2021%2F12%2F12%2F085639\" title=\" Crystal - \u578b\u306e\u5224\u5b9a\u65b9\u6cd5 \u3010is_a?\u3011 - \u3082\u306e\u3065\u304f\u308a\u306e\u30d6\u30ed\u30b0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2021-12-12 08:56:39","categories":["Crystal","Crystal-\u69cb\u6587"],"url":"https://a1026302.hatenablog.com/entry/2021/12/12/085639","width":"100%","type":"rich","blog_title":"\u3082\u306e\u3065\u304f\u308a\u306e\u30d6\u30ed\u30b0","provider_name":"Hatena Blog","version":"1.0","author_name":"a1026302","image_url":null,"title":" Crystal - \u578b\u306e\u5224\u5b9a\u65b9\u6cd5 \u3010is_a?\u3011","provider_url":"https://hatena.blog"}