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Re: Remove last element in a list


From: Barry Margolin
Subject: Re: Remove last element in a list
Date: Tue, 17 Nov 2009 16:26:04 -0500
User-agent: MT-NewsWatcher/3.5.3b3 (Intel Mac OS X)

In article 
<address@hidden>,
 LanX <address@hidden> wrote:

> ----------- M-x ielm
> ELISP> list
> (a b c d e f g h i)
> 
> ELISP> (nbutlast list 1)
> (a b c d e f g h)
> 
> ELISP> list
> (a b c d e f g h)
> -------------
> 
> see  "5.3 Accessing Elements of Lists" in  Elisp-Info
> 
> HTH
>   LanX

ELISP> list
(a)

ELISP> (nbutlast list 1)
nil

ELISP> list
(a)

Moral: always assign the result back to the variable, even when using 
destructive operations, e.g.

ELISP> (setq list (nbutlist list 1))
nil

ELISP> list
nil

-- 
Barry Margolin, address@hidden
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***


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