{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkiririmode.hatenablog.jp%2Fentry%2F20080329%2Fp3\" title=\"\u554f\u984c3-20 (3.3.1 Mutable List Structure) - \u7406\u7cfb\u5b66\u751f\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>","categories":["SICP"],"version":"1.0","provider_url":"https://hatena.blog","provider_name":"Hatena Blog","description":"cons, car, cdr, set-car!, set-cdr! \u3092 local state \u3068 assignment \u3067\u5b9f\u73fe\u3057\u305f\u4ee5\u4e0b\u306e\u95a2\u6570\u30bb\u30c3\u30c8\uff0e (define (cons x y) (define (set-x! v) (set! x v)) (define (set-y! v) (set! y v)) (define (dispatch m) (cond ((eq? m 'car) x) ((eq? m 'cdr) y) ((eq? m 'set-car!) set-x!) ((eq? m 'set-cdr!) set-y!) (else (error \"Undefined ope\u2026","height":"190","author_url":"https://blog.hatena.ne.jp/kiririmode/","blog_title":"\u7406\u7cfb\u5b66\u751f\u65e5\u8a18","author_name":"kiririmode","url":"https://kiririmode.hatenablog.jp/entry/20080329/p3","blog_url":"https://kiririmode.hatenablog.jp/","type":"rich","width":"100%","title":"\u554f\u984c3-20 (3.3.1 Mutable List Structure)","published":"2008-03-29 00:00:02","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/k/kiririmode/20080328/20080328235815.png"}