{"description":"\u307e\u305a\uff0c\u5404\u30b9\u30c6\u30c3\u30d7\u3067 sum \u306e\u5024\u306f\u3069\u3046\u306a\u3063\u3066\u3044\u308b\u306e\u304b! (define sum 0) (define (accum x) (set! sum (+ x sum)) sum) (define seq (stream-map accum (stream-enumerate-interval 1 20))) (define y (stream-filter even? seq)) (define z (stream-filter (lambda (x) (= (remainder x 5) 0)) seq)) (stream-ref y 7) (display-stream z) (stream-m\u2026","height":"190","blog_title":"\u7406\u7cfb\u5b66\u751f\u65e5\u8a18","width":"100%","categories":["SICP"],"title":"\u554f\u984c 3-52 (3.5.1  Streams Are Delayed Lists)","url":"https://kiririmode.hatenablog.jp/entry/20080812/p10","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkiririmode.hatenablog.jp%2Fentry%2F20080812%2Fp10\" title=\"\u554f\u984c 3-52 (3.5.1  Streams Are Delayed Lists) - \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>","version":"1.0","provider_url":"https://hatena.blog","blog_url":"https://kiririmode.hatenablog.jp/","author_name":"kiririmode","provider_name":"Hatena Blog","published":"2008-08-12 00:00:09","type":"rich","author_url":"https://blog.hatena.ne.jp/kiririmode/","image_url":null}