shigemk2 https://blog.hatena.ne.jp/shigemk2/ by shigemk2 https://www.shigemk2.com/ Emacs Lisp add-to-listより短く、また汎変数も利用可能。 (setq l nil) (push 1 l) ; => (1) (macroexpand '(push 1 l)) ; => (setq l (cons 1 l)) l ; => (1) (push 2 l) ; => (2 1) l ; => (2 1) (cons 2 l) ; => (2 2 1) l ; => (2 1) (pushnew 2 l) ; => (2 1) (macroexpand '(pushnew 2 l)) ; => (let ((x 2)) (if (memql x l) l (setq l (cons x… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2F20120423%2F1335125121" title="リスト要素を更新 削除する - 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 2012-04-23 05:05:21 rich https://www.shigemk2.com/entry/20120423/1335125121 1.0 100%