{"blog_url":"https://sirocco.hatenadiary.org/","type":"rich","url":"https://sirocco.hatenadiary.org/entry/20110413/1302727814","height":"190","author_url":"https://blog.hatena.ne.jp/sirocco/","version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fsirocco.hatenadiary.org%2Fentry%2F20110413%2F1302727814\" title=\"List \u3082\u30e2\u30ca\u30c9 - 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>","published":"2011-04-13 05:50:14","width":"100%","author_name":"sirocco","description":"\u3042\u3069\u3051\u306a\u3044\u8a71 / QA\u3067\u5b66\u3076Monad\u3092\u8aad\u3093\u3067\u3044\u307e\u3059\u3002 fmap \u306f\u540d\u524d\u304b\u3089\u3057\u3066 map \u306e\u89aa\u621a\u3067 \u95a2\u6570\u3092 List \u306b\u6458\u8981\u3055\u305b\u308b\u306e\u304b\u3068\u601d\u3063\u305f\u3089\u3001\u9055\u3063\u305f\u2026Orz ghci> :m Control.Applicative ghci> :t map map :: (a -> b) -> [a] -> [b] ghci> :t fmap fmap :: (Functor f) => (a -> b) -> f a -> f b > map (+1) [1,2,3] -- => [2,3,4] > fmap (+1) [1,2,3] -- => [2,3,4] > fmap (+1) [Just 1,\u2026","provider_name":"Hatena Blog","categories":["Haskell"],"image_url":null,"title":"List \u3082\u30e2\u30ca\u30c9","provider_url":"https://hatena.blog","blog_title":"sirocco \u306e\u66f8\u3044\u3066\u3082\u3059\u3050\u306b\u5fd8\u308c\u308b\u30e1\u30e2"}