From: Barry Margolin <barmar@alum.mit.edu>
To: help-gnu-emacs@gnu.org
Subject: Re: a little help with basic elisp
Date: Fri, 20 Feb 2015 02:39:04 -0500 [thread overview]
Message-ID: <barmar-26A115.02390420022015@88-209-239-213.giganet.hu> (raw)
In-Reply-To: ILAFw.813229$394.409278@fx25.am4
In article <ILAFw.813229$394.409278@fx25.am4>,
Glen Stark <mail@glenstark.net> wrote:
> Hi everyone
>
> I'm having trouble with the basics of lisp, and I'd like some help
> understanding and correcting what I am doing wrong in the following mce:
>
>
> (defun gas-push-sr-pair ()
> "I want to add a apair consisting of a the string I prompted for at the
> mini-buffer, and the string yo"
> (interactive)
> (let (to-string)
> (setq to-string (read-from-minibuffer (concat (thing-at-point
> 'symbol) " to: ")))
> (add-to-list 'gas-sr-stack '(to-string . "yo") )
> )
> )
>
>
> When I run this, and do (insert (pop gas-sr-stack)), I get the
> following:
>
> gas-pop-word: Wrong type argument: char-or-string-p, (to-string . "yo")
>
> From this I can see that I probably can't insert a char-or-string-p. I
No, you can ONLY insert a char-or-string-p. It's telling you what type
it's supposed to be. Since it wasn't, you got an error.
> guess I can figure that out -- it's not really part of my end goal
> problem anyway.
>
> What's tripping me up is it seems that the values stored in the char-or-
> string-p are to-string and "yo".
(to-string . "yo") is a cons. Its car is the symbol to-string, its cdr
is the string "yo". You can't insert a cons.
>
> I wanted to store the value which is currently in to-string, and "yo".
When you quote something, you prevent evaluation of the contents. If you
want to get the value of to-string, you have to access it without
quoting:
(add-to-list 'gas-sr-stack (cons to-string "yo"))
>
> Can someone please explain to me what I am doing wrong? I'd like to
> understand the language better, and of course solve my concrete problem.
>
> Cheers
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
next prev parent reply other threads:[~2015-02-20 7:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-20 6:47 a little help with basic elisp Glen Stark
2015-02-20 7:39 ` Barry Margolin [this message]
2015-02-20 7:52 ` Drew Adams
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