Subject: Re: Removing an item from a list?
From: Erik Naggum <>
Date: Fri, 19 Apr 2002 17:27:31 GMT
Newsgroups: comp.lang.lisp
Message-ID: <>

* Kalle Olavi Niemitalo <>
| Is REMOVE-IF TEST SEQUENCE :COUNT NIL guaranteed to give
| elements to TEST in the same order as they are in SEQUENCE? 
| I don't see why an implementation would do otherwise, though.

  I think this case is fairly obvious (i.e., I would complain if anyone
  were "smart" and did something else), but it is less obvious that
  supplying :from-end t :count nil will call the test on elements in the
  reverse order, since from-end is specified to have an effect only when
  count is non-nil.  All implementations that I can test this on, however,
  do call test in the reverse order.  [I used this simple call to see the
  effect: (remove-if #'print '(1 2 3 4) :from-end t).]

  In a fight against something, the fight has value, victory has none.
  In a fight for something, the fight is a loss, victory merely relief.

  Post with compassion: