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Re: Creating a list
From: |
David Kastrup |
Subject: |
Re: Creating a list |
Date: |
Thu, 19 Nov 2009 09:35:25 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (gnu/linux) |
Cecil Westerhof <Cecil@decebal.nl> writes:
> At the moment I create a list with:
> (setq ret-val (cons total-amount (cons current-amount ())))
> I thought about doing it with:
> (setq ret-val (cons total-amount '(current-amount)))
>
> But then the second value is the string current-amount
Wrong. The _symbol_ current-amount.
> instead of the value of current-amount. Is there a better way to build
> the list? At this moment it is not a problem, but when I want to build
> a list from 30 values ...
I would really recommend taking a look at the Introduction to Elisp
Programming
(info "(eintr)")
Press C-x C-e here --^
This is sort of obvious:
(setq ret-val (list total-amount current-amount))
If you have a large piece of structure around the variable values and
would prefer to write it in its unevaluated form, you can also use
(setq ret-val `(,total-amount ,current-amount))
namely backquote the entire structure, and put a comma before everything
within the structure that is to evaluated instead of quoted. After
byte-compilation, the resulting code is rather the same.
--
David Kastrup
- Creating a list, Cecil Westerhof, 2009/11/19
- Re: Creating a list,
David Kastrup <=
- Re: Creating a list, Cecil Westerhof, 2009/11/19
- Re: Creating a list, David Kastrup, 2009/11/19
- Re: Creating a list, Cecil Westerhof, 2009/11/19
- Re: Creating a list, Barry Margolin, 2009/11/19
- Re: Creating a list, Cecil Westerhof, 2009/11/19
- Re: Creating a list, Pascal J. Bourguignon, 2009/11/19
- Re: Creating a list, David Kastrup, 2009/11/19
- Re: Creating a list, Cecil Westerhof, 2009/11/19
- Re: Creating a list, Pascal J. Bourguignon, 2009/11/19
Gnus: Some new mails are automatically marked as 'O', Wang Lei, 2009/11/19