shigemk2 https://blog.hatena.ne.jp/shigemk2/ by shigemk2 https://www.shigemk2.com/ Emacs Lisp (defmacro for-wrong1 (var start end &rest body) (declare (indent 3)) `(let ((,var ,start)) (while (<= ,var ,end) ,@body (setq ,var (1+ ,var))))) ;; 123nil ;; でもendが関数だったら、副作用も一緒に繰り返される ;; そして評価回数は4回となる。 (for-wrong1 i 1 3 (princ i)) ; => nil ;; 333nil (for-wrong1 i 1 3 (princ 3)) ; => nil ;; 3333333n… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2F20120419%2F1334806700" title="評価回数と変数補足 - by shigemk2" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> http://ecx.images-amazon.com/images/I/51Wg39T8KAL.jpg Hatena Blog https://hatena.blog 2012-04-19 12:38:20 rich https://www.shigemk2.com/entry/20120419/1334806700 1.0 100%