{"published":"2018-03-28 21:04:25","height":"190","width":"100%","version":"1.0","blog_title":"Arantium Maestum","provider_url":"https://hatena.blog","description":"Exercise F \u7b2c\u4e00\u90e8 \u4efb\u610f\u306e\u6709\u9650\u30ea\u30b9\u30c8xs\u306b\u3064\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u7b49\u5f0f\u304c\u6210\u308a\u7acb\u3064\u3053\u3068\u3092\u8a3c\u660e\u305b\u3088\uff1a foldl f e xs = foldr (flip f) e (reverse xs) \u5e30\u7d0d\u6cd5\u3067\u89e3\u304f\u3002 Case [] \u5de6\u8fba foldl f e [] = {foldl\u306e\u5b9a\u7fa9} e Case [] \u53f3\u8fba foldr (flip f) e (reverse []) = {reverse [] = []} foldr (flip f) e [] = {foldr\u306e\u5b9a\u7fa9} e Case []\u306f\u8a3c\u660e\u3067\u304d\u305f\u3002 Case x:xs \u5de6\u8fba foldl f e (x:xs) = {foldl\u306e\u5b9a\u7fa9} foldl\u2026","url":"https://zehnpaard.hatenablog.com/entry/2018/03/28/210425","blog_url":"https://zehnpaard.hatenablog.com/","categories":["Haskell","Thinking Functionally with Haskell"],"author_url":"https://blog.hatena.ne.jp/zehnpaard/","type":"rich","author_name":"zehnpaard","title":"Thinking Functionally with Haskell\u52c9\u5f37\u30e1\u30e2: \u7b2c\uff16\u7ae0\u554f\u984c\uff12","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fzehnpaard.hatenablog.com%2Fentry%2F2018%2F03%2F28%2F210425\" title=\"Thinking Functionally with Haskell\u52c9\u5f37\u30e1\u30e2: \u7b2c\uff16\u7ae0\u554f\u984c\uff12 - Arantium Maestum\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":"https://chart.apis.google.com/chart?cht=tx&chl=%7B%5Csum_%7Bn%3D0%7D%5E%7B%5Cinfty%7D%20%5Cfrac%7B1%7D%7Bn%21%7D%20%3D%20e%7D","provider_name":"Hatena Blog"}