From: Florian Beck <abstraktion@t-online.de>
To: help-gnu-emacs@gnu.org
Subject: Re: Checking if all values of a list are true
Date: Fri, 11 Jul 2008 13:51:19 +0200 [thread overview]
Message-ID: <87bq14oczs.fsf@sophokles.streitblatt.de> (raw)
In-Reply-To: 2d973602-87f8-4d16-a031-a99bab267a36@y21g2000hsf.googlegroups.com
Nordlöw <per.nordlow@gmail.com> writes:
> On 11 Juli, 13:33, Nordlöw <per.nord...@gmail.com> wrote:
>> On 11 Juli, 13:23, Nordlöw <per.nord...@gmail.com> wrote:
>>
>> > How do I check if all values of a list are true?
>>
>> > This is my attempt:
>> > (reduce 'and '(t t))
>>
>> > but I get the error: and (invalid-function and)
>>
>> > (functionp 'and)
>>
>> > gives true so why on earth doesn't this work?
Maybe because 'and is a special form, not a function.
Try (reduce #'(lambda (x y) (and x y)) '(t t t t t t t))
> It would be even better if Emacs already had a function typically
> named any-p(arg-list) that returned t if all values in arg-list are
> non-nil.
Something like
(defmacro every-p (list)
(cons 'and (eval list)))
CL has 'every:
(every 'eval '(t t t))
--
Florian Beck
next prev parent reply other threads:[~2008-07-11 11:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-11 11:23 Checking if all values of a list are true Nordlöw
2008-07-11 11:33 ` Nordlöw
2008-07-11 11:37 ` Nordlöw
2008-07-11 11:51 ` Florian Beck [this message]
2008-07-11 11:56 ` Joost Kremers
2008-07-11 16:38 ` David Kastrup
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