{"author_url":"https://blog.hatena.ne.jp/boscono/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fboscono.hatenablog.com%2Fentry%2F20060610%2Fp1\" title=\" Haskell\u306e\u52c9\u5f37 (4) - \u30ea\u30b9\u30c8 (1) - \u3066\u304d\u3068\u3046\u306a\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","url":"https://boscono.hatenablog.com/entry/20060610/p1","categories":["Haskell"],"title":" Haskell\u306e\u52c9\u5f37 (4) - \u30ea\u30b9\u30c8 (1)","provider_name":"Hatena Blog","height":"190","published":"2006-06-10 00:00:00","description":"\u57fa\u672c\u7684\u306a\u30ea\u30b9\u30c8\u51e6\u7406\u95a2\u6570\u306fPreludeList\u306e\u4e2d\u306b\u3042\u308b\uff0eHaskell 98 Report\u306b\u5b9f\u88c5\u306e\u30b5\u30f3\u30d7\u30eb\u304c\u8a18\u8ff0\u3055\u308c\u3066\u3044\u308b\uff0ehttp://www.haskell.org/onlinereport/standard-prelude.html head, tail, last, init, null head :: [a] -> a head (x:_) = x head [] = error \"Prelude.head: empty list\" tail :: [a] -> [a] tail (_:xs) = xs tail [] = error \"Prelude.tail: empty li\u2026","provider_url":"https://hatena.blog","image_url":null,"blog_url":"https://boscono.hatenablog.com/","author_name":"boscono","type":"rich","version":"1.0","blog_title":"\u3066\u304d\u3068\u3046\u306a\u30e1\u30e2","width":"100%"}