From: Emanuel Berg <incal@dataswamp.org>
To: help-gnu-emacs@gnu.org
Subject: Re: cond construct for situation when a variable is t
Date: Tue, 22 Aug 2023 21:29:23 +0200 [thread overview]
Message-ID: <877cpm98q4.fsf@dataswamp.org> (raw)
In-Reply-To: fGnRvqkdkFuisqCMc-Q6vHXCCGPfK9HO7K7-95Y_61DGLU3MvVpo7kmPGzhugkdO_ThXbinJqUeE98gC7JxCtDPWgIccs4hGCkPznUUoU4Y=@protonmail.com
Heime wrote:
>>> How can I use the 'cond' construct for the case when
>>> a variable is 't' ?
>>
>> It could look like this but in practice one would probably
>> put it in another way, that looks better.
>>
>> (setq var nil)
>>
>> (cond
>> (var 1)
>> ((not var) 0) )
>
> Which one looks better, the one you wrote with 0 and 1 ?
No, that was for demonstration purposes only, that what you
asked for is possible to do with `cond'.
In practice I think most people would find another solution to
express the same thing, but it is as valid so if you like it,
that is up to you.
>> You can, you totally can. Just don't `setq' t to anything :)
>
> Right, because one can set the letter t to something which
> would then screw up the idea that t means a truth condition.
And all code that relies on that idea :)
--
underground experts united
https://dataswamp.org/~incal
next prev parent reply other threads:[~2023-08-22 19:29 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-18 14:00 cond construct for situation when a variable is t Heime
2023-08-19 22:04 ` Emanuel Berg
2023-08-22 12:18 ` Heime
2023-08-22 16:10 ` [External] : " Drew Adams
2023-08-22 19:31 ` Emanuel Berg
2023-08-23 19:49 ` Drew Adams
2023-08-22 19:29 ` Emanuel Berg [this message]
2023-08-22 12:32 ` Heime
2023-08-22 16:17 ` [External] : " Drew Adams
2023-08-22 20:21 ` Heime
2023-08-22 21:07 ` Drew Adams
2023-08-19 22:43 ` Rudolf Adamkovič
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