{"published":"2011-02-26 05:30:44","author_url":"https://blog.hatena.ne.jp/sirocco/","width":"100%","author_name":"sirocco","title":"liftM\u3092\u5b66\u3076(\u30e2\u30ca\u30c9\u306b\u95a2\u6570\u3092\u9069\u7528\u3059\u308b)","type":"rich","provider_name":"Hatena Blog","blog_url":"https://sirocco.hatenadiary.org/","description":"liftM \u306e\u4f7f\u3044\u65b9\u304c\u5206\u304b\u3089\u306a\u304b\u3063\u305f\u306e\u3067\u8abf\u3079\u3066\u307f\u307e\u3057\u305f\u3002 ghci> :m + Control.Monad ghci> :t liftM liftM :: (Monad m) => (a1 -> r) -> m a1 -> m r liftM \u306f a1 \u3092\u5f15\u6570\u306b r \u3092\u5e30\u3059\u95a2\u6570\u3068 \u30e2\u30ca\u30c9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9 a1 \u3092\u5f15\u6570\u306b\u3068\u308a\u3001 \u30e2\u30ca\u30c9\u306e r \u3092\u8fd4\u3059\u3002 \u3064\u307e\u308a\u3001a1 \u3092\u5f15\u6570\u306b r \u3092\u5e30\u3059\u666e\u901a\u306e\u95a2\u6570\u3092\u30e2\u30ca\u30c9\u306b\u3082\u9069\u7528\u51fa\u6765\u308b\u3088\u3046\u306b\u3059\u308b\u3082\u306e\u3001\u3063\u3066\u7406\u89e3\u3067\u826f\u3044\u304b\u306a\u3002\u300cliftM\u95a2\u9023 - \u304a\u3063\u3071\u3044\u5927\u9b54\u795e\u306e\u65e5\u8a18\u300d\u306e\u4f8b\u304c\u5206\u304b\u308a\u3084\u3059\u3044\u3002 import Control.Monad str = return \"Haskel\u2026","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fsirocco.hatenadiary.org%2Fentry%2F20110226%2F1298752244\" title=\"liftM\u3092\u5b66\u3076(\u30e2\u30ca\u30c9\u306b\u95a2\u6570\u3092\u9069\u7528\u3059\u308b) - 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>","height":"190","url":"https://sirocco.hatenadiary.org/entry/20110226/1298752244","version":"1.0","blog_title":"sirocco \u306e\u66f8\u3044\u3066\u3082\u3059\u3050\u306b\u5fd8\u308c\u308b\u30e1\u30e2","categories":["Haskell"],"provider_url":"https://hatena.blog"}