{"version":"1.0","blog_title":"Yohpapa\u2019s note","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fyohpapa.hatenadiary.org%2Fentry%2F20100808%2F1281272595\" title=\" \u30e2\u30ca\u30c9 - Yohpapa\u2019s note\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_url":"https://blog.hatena.ne.jp/yohpapa/","title":" \u30e2\u30ca\u30c9","width":"100%","url":"https://yohpapa.hatenadiary.org/entry/20100808/1281272595","image_url":null,"author_name":"yohpapa","blog_url":"https://yohpapa.hatenadiary.org/","categories":["haskell"],"height":"190","type":"rich","provider_name":"Hatena Blog","published":"2010-08-08 22:03:15","description":"11.2 Maybe\u30e2\u30ca\u30c9 \u3061\u3087\u3063\u3068\u5fa9\u7fd2 \u524d\u56de\u3001\u95a2\u6570\u304cMaybe a\u578b\u623b\u308a\u5024\u3092\u8fd4\u3059\u3053\u3068\u3067\u7d9a\u304f\u95a2\u6570\u3092\u5b9f\u884c\u3057\u306a\u3044\u3053\u3068\u304c\u53ef\u80fd\u3068\u66f8\u304d\u307e\u3057\u305f\u3002 \u307e\u3041\u3001\u6a21\u5f0f\u7684\u306b\u66f8\u304f\u3068\u3053\u3093\u306a\u611f\u3058\u3002 func a -> Maybe a -> Maybe a func a Nothing = Nothing func a (Just b) = \u4f55\u3089\u304b\u306e\u8a08\u7b97\u7d50\u679c\u3092\u8fd4\u3059 func 1 $ func 2 $ func 3 $ func 4 \u4f55\u3089\u304b\u306e\u5f15\u6570 func\u3092\u6458\u8981\u3059\u308b\u9014\u4e2d\u3067\u8a08\u7b97\u7d50\u679c\u304cNothing\u306b\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u3089\u3001 \u305d\u308c\u4ee5\u964d\u306e\u95a2\u6570\u9069\u7528\u3067\u306f\u3001\u4f55\u3082\u305b\u305a\u306bNothing\u3092\u8fd4\u3059\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002 (>>=)\u3068return\u306b\u3064\u3044\u3066 \u3053\u308c\u3092\u2026","provider_url":"https://hatena.blog"}