{"image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhigepon.hatenablog.com%2Fentry%2F20080526%2F1211809257\" title=\" do \u306e\u30d0\u30b0\u306e\u4fee\u6b63\u5b8c\u4e86 - higepon blog\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","provider_name":"Hatena Blog","provider_url":"https://hatena.blog","url":"https://higepon.hatenablog.com/entry/20080526/1211809257","author_name":"higepon","version":"1.0","description":"\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30de\u30af\u30ed\u3092\u5b9a\u7fa9\u3057\u3066 do \u306e\u30d0\u30b0\u3092\u4fee\u6b63\u3057\u305f\u3002(\u30de\u30af\u30ed\u306e\u5143\u30cd\u30bf\u306fR6RS) (define-macro (do . sexp) (match sexp [(((var init step ...) ...) (test expr ...) command ...) `(letrec ((loop (lambda (,@var) (if ,test (begin #f ; avoid empty begin ,@expr) (begin ,@command (loop ,@(map (lambda (v s) `(do \"step\" ,v ,@s)) var step))))))) (l\u2026","blog_url":"https://higepon.hatenablog.com/","title":" do \u306e\u30d0\u30b0\u306e\u4fee\u6b63\u5b8c\u4e86","author_url":"https://blog.hatena.ne.jp/higepon/","type":"rich","categories":["mosh","scheme"],"height":"190","published":"2008-05-26 22:40:57","blog_title":"higepon blog","width":"100%"}