{"url":"https://bitterharvest.hatenablog.com/entry/2017/02/23/071611","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/b/bitterharvest/20170222/20170222104958.png","published":"2017-02-23 07:16:11","author_name":"bitterharvest","height":"190","version":"1.0","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/bitterharvest/","blog_url":"https://bitterharvest.hatenablog.com/","width":"100%","categories":["\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u305f\u3081\u306e\u570f\u8ad6 (\u521d\u7d1a\u7de8\uff1a\u570f\u8ad6\u3068Haskell)"],"type":"rich","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbitterharvest.hatenablog.com%2Fentry%2F2017%2F02%2F23%2F071611\" title=\"\u95a2\u624b\u30fc\u53cc\u95a2\u624b - 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>","title":"\u95a2\u624b\u30fc\u53cc\u95a2\u624b","blog_title":"bitterharvest\u2019s diary","description":"\uff16\uff0e\uff15 \u53cc\u95a2\u624b \uff11\uff09\u95a2\u624b\u3068\u3057\u3066\u306e\u7a4d\u3068\u4f59\u7a4d \u524d\u3005\u56de\u306e\u8a18\u4e8b\u3067\u3001Haskell\u304c\u7528\u610f\u3057\u3066\u3044\u308b\u95a2\u624b\u306e\u30ea\u30b9\u30c8\u3092\u793a\u3057\u305f\u3002 Prelude> :i Functor class Functor (f :: * -> *) where fmap :: (a -> b) -> f a -> f b (<$) :: a -> f b -> f a {-# MINIMAL fmap #-} -- Defined in \u30fbeGHC.Base\u2019 instance Functor (Either a) -- Defined in \u2018Data.Either\u2019 instance Functor [] -- Defined in\u2026"}