{"provider_name":"Hatena Blog","author_name":"faith_and_brave","blog_title":"Faith and Brave - C++\u3067\u904a\u307c\u3046","version":"1.0","blog_url":"https://faithandbrave.hateblo.jp/","author_url":"https://blog.hatena.ne.jp/faith_and_brave/","height":"190","published":"2011-09-12 15:42:27","categories":["Haskell"],"width":"100%","provider_url":"https://hatena.blog","type":"rich","title":" takeWhile\u3067take\u3001dropWhile\u3067drop\u3092\u5b9a\u7fa9\u3059\u308b","url":"https://faithandbrave.hateblo.jp/entry/20110912/1315809747","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ffaithandbrave.hateblo.jp%2Fentry%2F20110912%2F1315809747\" title=\" takeWhile\u3067take\u3001dropWhile\u3067drop\u3092\u5b9a\u7fa9\u3059\u308b - Faith and Brave - C++\u3067\u904a\u307c\u3046\" 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":null,"description":"\u3061\u3087\u3063\u3068\u524d\u306b id:uskz \u5148\u751f\u306b\u300cPStade.Oven\u306ftakenWhile\u304b\u3089taken\u3092\u5b9a\u7fa9\u3057\u3066\u308b\u304b\u3089\u3001Haskell\u3067\u3082\u3067\u304d\u308b\u3093\u3058\u3083\u306a\u3044\u3067\u3059\u304b\u300d\u3068\u30cd\u30bf\u632f\u308a\u3057\u3066\u305f\u306e\u3067\u3001\u66f8\u3044\u3066\u307f\u307e\u3057\u305f\u3002 \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u30ea\u30b9\u30c8\u3068\u4e00\u7dd2\u306b\u30eb\u30fc\u30d7\u3057\u3066\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u6bd4\u8f03\u3059\u308b\u8ff0\u8a9e\u3092xxxWhile\u306b\u6e21\u3057\u307e\u3059\u3002 \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30ea\u30b9\u30c8\u306f\u7d50\u679c\u3068\u3057\u3066\u3044\u3089\u306a\u3044\u306e\u3067\u3001\u6700\u5f8c\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u9664\u3044\u305f\u30ea\u30b9\u30c8\u3092\u62bd\u51fa\u3002 take\u3002 take2 :: Int -> [a] -> [a] take2 n xs = map snd (takeWhile (preds n) (zxs xs)) where zxs xs = zip (enumF\u2026"}