{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fso-wh.at%2Fentry%2F20070424%2Fp4\" title=\" \u554f\u984c1.31 - so what\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","description":"\u50d5\u306e\u89e3\u7b54 (define (product term a next b) (if (> a b) 1 (* (term a) (product term (next a) next b)))) ;(define (product term a next b) ; (define (iter a result) ; (if (> a b) ; result ; (iter (next a) (* result (term a))))) ; (iter a 1)) (define (factorial n) (product (lambda (x) x) 1 (lambda (x) (+ x 1)\u2026","provider_name":"Hatena Blog","blog_title":"so what","blog_url":"https://so-wh.at/","image_url":null,"author_url":"https://blog.hatena.ne.jp/winebarrel/","height":"190","author_name":"winebarrel","title":" \u554f\u984c1.31","version":"1.0","url":"https://so-wh.at/entry/20070424/p4","type":"rich","published":"2007-04-24 00:00:00","provider_url":"https://hatena.blog","width":"100%","categories":["SICP"]}