{"url":"https://blog.tmtms.net/entry/2015/12/12/crystal","categories":["Crystal","Ruby"],"author_url":"https://blog.hatena.ne.jp/tmtms/","blog_url":"https://blog.tmtms.net/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog.tmtms.net%2Fentry%2F2015%2F12%2F12%2Fcrystal\" title=\"Crystal \u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u304c nilable \u306b\u306a\u3063\u3066\u3064\u3089\u3044 - tmtms \u306e\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":null,"blog_title":"tmtms \u306e\u30e1\u30e2","height":"190","type":"rich","version":"1.0","provider_name":"Hatena Blog","provider_url":"https://hatena.blog","description":"\u3053\u308c\u306f\u300cRuby\u8133\u306b\u306fCrystal\u3064\u3089\u3044 Advent Calendar 2015\u300d\u306e12\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002 qiita.com Crystal \u3067 Ruby \u3068\u540c\u3058\u3088\u3046\u306a\u611f\u899a\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u4f7f\u3046\u3068 nil \u3060\u3068\u6012\u3089\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002 class Hoge def hoge @hoge = \"abc\" @hoge.size end end Hoge.new.hoge % crystal hoge.cr Error in ./hoge.cr:8: instantiating 'Hoge#hoge()' Hoge.new.hoge ^~~~ in ./hoge.cr:4: undefined\u2026","title":"Crystal \u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u304c nilable \u306b\u306a\u3063\u3066\u3064\u3089\u3044","author_name":"tmtms","published":"2015-12-12 00:00:00","width":"100%"}