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use of mapcan
- To: email@example.com
- Subject: use of mapcan
- From: firstname.lastname@example.org (Dan Stanger)
- Date: Wed, 22 Feb 1995 14:52:48 -0700
- Cc: email@example.com
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?