{"provider_name":"Hatena Blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Flogicoffee.hatenablog.com%2Fentry%2F2018%2F10%2F24%2F155858\" title=\"Haskell\u306eState\u30e2\u30ca\u30c9\u3092\u5b9a\u7fa9\u304b\u3089\u7406\u89e3\u3059\u308b - logicoffee \u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u52c9\u5f37\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","provider_url":"https://hatena.blog","description":"\u672c\u8a18\u4e8b\u306e\u76ee\u7684 \u89e3\u8aac State\u30e2\u30ca\u30c9\u306e\u5b9a\u7fa9 \u3072\u3068\u3064\u306e\u88dc\u984c \u30b3\u30fc\u30c9\u3092\u8aad\u307f\u89e3\u3044\u3066\u3044\u304f \u307e\u305a\u306f\u90e8\u5206\u7684\u306b \u305d\u3057\u3066\u5168\u4f53\u3078 \u307e\u3068\u3081 \u672c\u8a18\u4e8b\u306e\u76ee\u7684 State\u30e2\u30ca\u30c9\u306e\u6319\u52d5\u3092\u5b9a\u7fa9\u304b\u3089\u5c0e\u51fa\u3057\u305f\u3044. \u305d\u308c\u304c\u672c\u8a18\u4e8b\u306e\u76ee\u6a19\u3067\u3059. State\u30e2\u30ca\u30c9\u306b\u3064\u3044\u3066\u8abf\u3079\u308b\u3068, \u3044\u304f\u3064\u304b\u306e\u8a18\u4e8b\u304c\u30d2\u30c3\u30c8\u3057\u307e\u3059. \u305d\u3053\u3067\u306fState\u30e2\u30ca\u30c9\u306e\u4f7f\u3044\u65b9\u3068\u3057\u3066\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u304c\u5f15\u304d\u5408\u3044\u306b\u51fa\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3057\u3087\u3046. import Control.Monad.State pickHead :: State [Int] Int pickHead = do x:xs <- get -- \u72b6\u614b(\u6574\u6570\u306e\u30ea\u30b9\u30c8)\u3092\u53d6\u5f97 put xs -- \u5148\u982d\u2026","categories":["Haskell"],"title":"Haskell\u306eState\u30e2\u30ca\u30c9\u3092\u5b9a\u7fa9\u304b\u3089\u7406\u89e3\u3059\u308b","height":"190","image_url":null,"blog_url":"https://logicoffee.hatenablog.com/","author_name":"riemann1618","url":"https://logicoffee.hatenablog.com/entry/2018/10/24/155858","author_url":"https://blog.hatena.ne.jp/riemann1618/","width":"100%","blog_title":"logicoffee \u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u52c9\u5f37\u65e5\u8a18","published":"2018-10-24 15:58:58","version":"1.0"}