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From: Jesper Harder <harder@ifa.au.dk>
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Subject: Re: Using CL in Gnus
Date: Sat, 29 Nov 2003 10:10:47 +0100
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Miles Bader <miles@gnu.org> writes:

> Jesper Harder <harder@ifa.au.dk> writes:
>
>> But in a lot of places the list isn't copied first.  In that case
>> -- and if speed matters -- `dolist' would degrade performance and
>> consing slightly.
>
> Huh?  dolist doesn't copy the list...

dolist establishes a let-binding for the list, which is often
unnecessary.  E.g.

(defun foo (list)
  (let (x)
    (while (setq x (pop list))
      ...)))

vs.

(defun bar (list)
  (let ((temp list) x)
    (while temp
      (setq x (car temp))
      (setq temp (cdr temp))
      ...))