{"blog_url":"https://okazuki.hatenablog.com/","published":"2012-02-23 09:25:30","height":"190","categories":["C#","LINQ"],"provider_url":"https://hatena.blog","type":"rich","provider_name":"Hatena Blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fokazuki.hatenablog.com%2Fentry%2F20120223%2F1329956730\" title=\"\u95a2\u6570\u7684\u306aMapReduce\u306b\u3088\u308b\u554f\u984c\u89e3\u6c7a via WEB+DB PRESS vol67 - \u304b\u305a\u304d\u306eBlog@hatena\" 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":"okazuki","blog_title":"\u304b\u305a\u304d\u306eBlog@hatena","image_url":null,"url":"https://okazuki.hatenablog.com/entry/20120223/1329956730","width":"100%","author_url":"https://blog.hatena.ne.jp/okazuki/","title":"\u95a2\u6570\u7684\u306aMapReduce\u306b\u3088\u308b\u554f\u984c\u89e3\u6c7a via WEB+DB PRESS vol67","description":"WEB+DB PRESS vol67\u304c\u5bb6\u306b\u5c4a\u3044\u305f\u306e\u3067\u307c\u3061\u307c\u3061\u8aad\u3093\u3067\u307e\u3059\u3002\u7279\u96c6\u306e\u6240\u3067\u300c\u95a2\u6570\u7684\u306aMapReduce\u306b\u3088\u308b\u554f\u984c\u89e3\u6c7a\u300d\u3068\u3044\u3046\u3053\u3068\u3067Haskell\u3092\u4f7f\u3063\u3066Map\u3068Reduce\u3067\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u3088\u3046\u3068\u3044\u3046\u306e\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u30b3\u30fc\u30c9\u306f\u3053\u3093\u306a\u611f\u3058\u3067\u3057\u305f\u3002 # via WEB+DB PRESS vol67 let ret1 = zip [0..] [10, 20, 30, 40, 50] let mul (i, x) = x * i let ret2 = map mul ret1 foldl (+) 0 ret2\u3053\u308c\u3067\u7d50\u679c\u304c400\u306b\u306a\u308b\u3068\u3044\u3046\u611f\u3058\u3067\u3059\u306d\u3002\u3068\u3044\u3046\u3053\u3068\u3067\u3055\u304f\u3063\u3068C#\u3067\u3082\u66f8\u3044\u3066\u307f\u307e\u3057\u305f\u3002\u7121\u9650\u2026","version":"1.0"}