Subject: Re: novice: mapcan use?
From: rpw3@rpw3.org (Rob Warnock)
Date: Sat, 03 Sep 2005 22:01:11 -0500
Newsgroups: comp.lang.lisp
Message-ID: <0pidnUSpg8nq_ofeRVn-gQ@speakeasy.net>
Pascal Costanza <pc@p-cos.net> wrote: +--------------- | It's a pity that both solutions have to do an extra pass through the | processed list as a last step. It would be nice if there were a way to | avoid that... +--------------- There is, but it involves keeping your own tail-pointer to the list you're (manually) COLLECT'ing, and then RPLACD the tail to point to the rest... -Rob ----- Rob Warnock <rpw3@rpw3.org> 627 26th Avenue <URL:http://rpw3.org/> San Mateo, CA 94403 (650)572-2607