Re: Basic questions about elisp

[Lennart Borgman <lennart.borgman@gmail.com>]

On Thu, Nov 5, 2009 at 12:13 PM, Francis Moreau <francis.moro@gmail.com> wrote:
> Hello,
>
> I'm trying to learn elisp and have a couple of basic questions.
>
> I'm iterating over a list using dotimes, but in the body of dotimes,
> the list can mutate. For example I have:
>
>  (dolist (elt lst)
>    ;; some codes
>    (nconc lst '(2)))
>
> This adds/appends a new element to 'lst' list. It looks like 'dotimes'
> doesn't like it.
>
> So I eventually wrote it like this
>
>    (setq i 0)
>    (while (< i (length lst))
>          ;; some codes
>          (x-nconc lst '(2))))
>      (setq i (1+ i)))
>
> which is a bit ugly, is there another way to do that ?

It is much easier to answer if you define exactly what you want to do
when lst grows.