[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
use of mapcan
- To: firstname.lastname@example.org
- Subject: use of mapcan
- From: email@example.com (Dan Stanger)
- Date: Wed, 22 Feb 1995 14:52:48 -0700
- Cc: firstname.lastname@example.org
i have a question regarding mapcan used as a filter. if i want to avoid
possible problems of side effects can i just return a cons containing
the value i want to keep? for example
(defun x (a) (if (keep a) (cons a nil) nil))
(mapcan #'x '(a b c d)).
will this avoid possible problems?