{"description":"7.3 \u7573\u8fbc\u95a2\u6570 foldr \u304b\u3089\u3067\u3059 \u5f15\u6570\u306b\u30ea\u30b9\u30c8\u3092\u53d6\u308b\u95a2\u6570\u306b\u3088\u304f\u3042\u308b\u30d1\u30bf\u30fc\u30f3 f [] = v f (x:xs) = x `op` f xs -- op \u306f\u6f14\u7b97\u5b50 foldr \u3092\u4f7f\u3046\u3068\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u95a2\u6570\u3068\u3057\u3066\u62bd\u51fa\u3067\u304d\u308b foldr (op) v \u304c \u4e0a\u3068\u540c\u3058\u306b\u306a\u308b \u7b2c6\u7ae0\u3067\u518d\u5e30\u3092foldr\u3067\u66f8\u304d\u76f4\u3057\u305f\u3088\u3046\u306b\u3001\u518d\u5e30\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u306f foldr \u306e\u4e2d\u306b\u9589\u3058\u8fbc\u3081\u3089\u308c\u308b foldr (op) [x0,x1,x2,...] = x0 `op` (x1 `op` (x2 `op` ....)) \u3068\u3044\u3046\u3053\u3068\u306f\u53f3\u9023\u7d50\u306a\u6f14\u7b97\u5b50\u306a\u306e\u3067\u5de6\u9023\u7d50\u306a\u30d1\u30bf\u30fc\u30f3\u3082\u2026\u2026\u3068\u3044\u3046\u306e\u304c\u5b9f\u306f\u3042\u3063\u3066\u305d\u308c\u304c foldl \u3060\u305d\u3046\u3067\u3059\u304c\u305d\u308c\u2026","author_url":"https://blog.hatena.ne.jp/morning_reading/","provider_url":"https://hatena.blog","type":"rich","width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmorning-reading.hatenadiary.org%2Fentry%2F20110223%2Fp1\" title=\"\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0 Haskell \u7b2c7\u7ae0 \u9ad8\u968e\u95a2\u6570 \u305d\u306e2 - \u6bce\u671d30\u5206\u8aad\u66f8\u4f1a\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0 Haskell \u7b2c7\u7ae0 \u9ad8\u968e\u95a2\u6570 \u305d\u306e2","published":"2011-02-23 00:00:00","blog_url":"https://morning-reading.hatenadiary.org/","provider_name":"Hatena Blog","blog_title":"\u6bce\u671d30\u5206\u8aad\u66f8\u4f1a","author_name":"morning_reading","height":"190","url":"https://morning-reading.hatenadiary.org/entry/20110223/p1","version":"1.0","categories":[],"image_url":null}