kiririmode https://blog.hatena.ne.jp/kiririmode/ 理系学生日記 https://kiririmode.hatenablog.jp/ SICP まず，各ステップで sum の値はどうなっているのか! (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… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkiririmode.hatenablog.jp%2Fentry%2F20080812%2Fp10" title="問題 3-52 (3.5.1 Streams Are Delayed Lists) - 理系学生日記" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2008-08-12 00:00:09 rich https://kiririmode.hatenablog.jp/entry/20080812/p10 1.0 100%