{"version":"1.0","url":"https://kazu-yamamoto.hatenablog.jp/entry/20110826/1314352340","description":"\u50d5\u304c Haskell \u3092\u5b66\u3073\u59cb\u3081\u305f\u9803\u3001Haskell \u306e\u6587\u6cd5\u306f\u3059\u3093\u306a\u308a\u3068\u306f\u982d\u306b\u5165\u3063\u3066\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3082\u3068\u3082\u3068\u50d5\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306e\u5b66\u7fd2\u80fd\u529b\u304c\u4f4e\u3044\u306e\u3067\u3001\u50d5\u3060\u3051\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u300c\u306f\u3058\u3081\u304b\u3089\u3053\u3046\u8a00\u3063\u3066\u3082\u3089\u3048\u308c\u3070\u5206\u304b\u3063\u305f\u306e\u306b\u3043\u300d\u3068\u3044\u3046\u3053\u3068\u3092\u66f8\u304d\u307e\u3059\u3002 \u306f\u3058\u3081\u306e\u4e00\u6b69 \u5206\u5c90\u306f case \u3067\u66f8\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b Maybe a \u306b\u5bfe\u3059\u308b\u4f8b\u3092\u66f8\u304d\u307e\u3059\u3002 case mx of Just x -> ... Nothing -> ... \u5ff5\u306e\u305f\u3081\u3001Maybe a \u306e\u5b9a\u7fa9\u3082\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002 data Maybe a = Nothing | Just a \u5217\u6319\u3055\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u69cb\u6210\u5b50\u3092 case \u306b\u5217\u6319\u3067\u304d\u308b\u3053\u3068\u304c\u5206\u304b\u308b\u2026","author_url":"https://blog.hatena.ne.jp/kazu-yamamoto/","type":"rich","provider_name":"Hatena Blog","categories":["Haskell"],"blog_url":"https://kazu-yamamoto.hatenablog.jp/","width":"100%","height":"190","blog_title":"\u3042\u3069\u3051\u306a\u3044\u8a71","title":"Haskell\u306e\u6587\u6cd5(\u5206\u5c90\u7de8)","image_url":null,"provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkazu-yamamoto.hatenablog.jp%2Fentry%2F20110826%2F1314352340\" title=\"Haskell\u306e\u6587\u6cd5(\u5206\u5c90\u7de8) - \u3042\u3069\u3051\u306a\u3044\u8a71\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_name":"kazu-yamamoto","published":"2011-08-26 18:52:20"}