{"image_url":null,"title":"unfold\u306e\u4f7f\u3044\u65b9\u3092\u628a\u63e1\u3059\u308b","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/trotr/","author_name":"trotr","blog_url":"https://trotr.hatenadiary.org/","type":"rich","width":"100%","published":"2008-04-13 18:26:39","url":"https://trotr.hatenadiary.org/entry/20080413/1208078799","provider_url":"https://hatena.blog","description":"fold\u3068\u5bfe\u306b\u306a\u308bunfold\u3068\u3044\u3046\u95a2\u6570\u304c\u5b58\u5728\u3059\u308b\u307f\u305f\u3044\u3002 fold unfold list -> anything anything -> list fold\u306f\u4f7f\u3044\u65b9\u304c\u5927\u4f53\u5206\u304b\u3063\u305f\u3088\u3046\u306a\u6c17\u304c\u3059\u308b\u3002 \u3067\u3082\u3001unfold\u306e\u4f7f\u3044\u9053\u304c\u3088\u304f\u308f\u304b\u3089\u306a\u3044\u3002 \u3057\u3070\u3089\u304f\u3001unfold\u3092\u4f7f\u3063\u3066\u3067\u304d\u305d\u3046\u306a\u3053\u3068\u3092\u63a2\u3057\u3066\u307f\u3088\u3046\u3068\u601d\u3063\u305f\u3002 (define (unfold p f g seed . arg) (let ((tail-gen (get-optional arg (lambda (x) '())))) (if (p seed) (tail-gen seed) (cons (f seed) (unfold p \u2026","version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftrotr.hatenadiary.org%2Fentry%2F20080413%2F1208078799\" title=\"unfold\u306e\u4f7f\u3044\u65b9\u3092\u628a\u63e1\u3059\u308b - trotr\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","height":"190","blog_title":"trotr\u306e\u65e5\u8a18","categories":["scheme"]}