{"blog_url":"https://sirocco.hatenadiary.org/","width":"100%","author_name":"sirocco","height":"190","title":" Maybe \u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3","author_url":"https://blog.hatena.ne.jp/sirocco/","provider_url":"https://hatena.blog","provider_name":"Hatena Blog","published":"2011-10-13 11:44:13","url":"https://sirocco.hatenadiary.org/entry/20111013/1318473853","blog_title":"sirocco \u306e\u66f8\u3044\u3066\u3082\u3059\u3050\u306b\u5fd8\u308c\u308b\u30e1\u30e2","type":"rich","categories":["Haskell"],"image_url":null,"version":"1.0","description":"Maybe \u578b\u3092\u4fbf\u5229\u306b\u64cd\u4f5c\u3059\u308b\u95a2\u6570\u300cHaskell 98 \u8a00\u8a9e\u3068\u30e9\u30a4\u30d6\u30e9\u30ea \u6539\u8a02\u30ec\u30dd\u30fc\u30c8 / 18 Maybe \u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u300d\u3092\u5199\u7d4c\u3057\u3066\u307f\u307e\u3059\u3002\u4eca\u307e\u3067\u81ea\u5206\u3067\u4f5c\u3063\u3066\u3044\u307e\u3057\u305f\u30fb\u30fb\u30fbOrz isJust :: Maybe a -> Bool > isJust (Just 10) -- > True > isJust Nothing -- > False isNothing :: Maybe a -> Bool > isNothing (Just 2) -- > False > isNothing Nothing -- > True fromJust :: Maybe a -> a > fromJu\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fsirocco.hatenadiary.org%2Fentry%2F20111013%2F1318473853\" title=\" Maybe \u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3 - sirocco \u306e\u66f8\u3044\u3066\u3082\u3059\u3050\u306b\u5fd8\u308c\u308b\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>"}