{"type":"rich","categories":["Haskell\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8b1b\u5ea7\uff08\u4e2d\u7d1a\u7de8\uff09"],"width":"100%","provider_name":"Hatena Blog","published":"2014-09-21 06:49:20","author_url":"https://blog.hatena.ne.jp/bitterharvest/","version":"1.0","description":"\uff11\uff0e\u9577\u3055\u3092\u5e30\u7d0d\u7684\u306b\u8868\u73fe\u3057\u305f\u6ce8\u91c8\u3064\u304d\u30ea\u30b9\u30c8 \u5143\u306b\u623b\u3063\u3066\u3001\u30ea\u30b9\u30c8\u306e\u9577\u3055\u3092\u6574\u6570\u3067\u306f\u306a\u304f\u5e30\u7d0d\u7684\u8868\u73fe\u3067\u306e\u30ea\u30b9\u30c8\u306e\u751f\u6210\u6cd5\u3092\u8003\u3048\u308b\u3002\u6700\u521d\u306b\u81ea\u7136\u6570Nat\u3092\u4ee3\u6570\u7684\u30c7\u30fc\u30bf\u578b\u3067\u5b9a\u7fa9\u3059\u308b\u3002 data Nat n = Z | S (Nat n) deriving Show \u3053\u3053\u3067\u3001Z\u306f\u81ea\u7136\u6570\u306e\u59cb\u307e\u308a\u3092\u793a\u3057\u3001S (Nat n)\u306f\u81ea\u7136\u6570(Nat n)\u306e\u6b21\u306e\u81ea\u7136\u6570\u3092\u8868\u3059\u3002Nat\u306f\u578b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3001n\u306f\u578b\u5f15\u6570\u3001Z\u3068S\u306f\u5024\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u3042\u308b\u3002\u6b21\u306b\u3001\u81ea\u7136\u6570\u3092\u5b9f\u969b\u306e\u6574\u6570\u306b\u5bfe\u5fdc\u3055\u305b\u308b\u305f\u3081\u306b\u95a2\u6570toInt\u3092\u7528\u610f\u3059\u308b\u3002 toInt :: Nat n -> Int toInt Z = 0 toInt (S n) = 1 + (toInt \u2026","url":"https://bitterharvest.hatenablog.com/entry/2014/09/21/064920","author_name":"bitterharvest","blog_title":"bitterharvest\u2019s diary","blog_url":"https://bitterharvest.hatenablog.com/","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbitterharvest.hatenablog.com%2Fentry%2F2014%2F09%2F21%2F064920\" title=\" \u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30fb\u30e2\u30ca\u30c9\u3067\u5929\u56fd\u3068\u5730\u7344\u3092\u884c\u3063\u305f\u308a\u6765\u305f\u308a\uff08\uff13\uff09 - bitterharvest\u2019s diary\" 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,"title":" \u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30fb\u30e2\u30ca\u30c9\u3067\u5929\u56fd\u3068\u5730\u7344\u3092\u884c\u3063\u305f\u308a\u6765\u305f\u308a\uff08\uff13\uff09","height":"190"}