{"version":"1.0","author_url":"https://blog.hatena.ne.jp/tmurata/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftmurata.hatenadiary.org%2Fentry%2F20090525%2F1243208451\" title=\"SICP\u554f\u984c2.36 - tmurata\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>","provider_url":"https://hatena.blog","published":"2009-05-25 08:40:51","blog_title":"tmurata\u306e\u65e5\u8a18","categories":["SICP"],"height":"190","title":"SICP\u554f\u984c2.36","type":"rich","blog_url":"https://tmurata.hatenadiary.org/","provider_name":"Hatena Blog","description":"\u5168\u3066\u304c\u540c\u6570\u306e\u8981\u7d20\u304b\u3089\u306a\u308b\u4e26\u3073\u306e\u4e26\u3073\u3092\u3068\u308b\u624b\u7d9a\u304d accumulate-n \u306e\u5b9a\u7fa9 (define (first-item seqs) (if (pair? seqs) (cons (car (car seqs)) (first-item (cdr seqs))) seqs)) (define (next-item seqs) (if (pair? seqs) (cons (cdr (car seqs)) (next-item (cdr seqs))) seqs)) (define (accumulate-n op init seqs) (if (null? (car seqs)) () (co\u2026","width":"100%","image_url":null,"author_name":"tmurata","url":"https://tmurata.hatenadiary.org/entry/20090525/1243208451"}