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Message-ID:  <7e9c44a0-153f-5211-f4df-7423844bb194@morningstar2.co.uk>
Date:         Sat, 8 Dec 2018 07:29:13 +0000
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From:         Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: Re: Conditional Functions in xparse
To:           LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
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Status: R

On 07/12/2018 19:17, Kelly Smith wrote:
> Hello,
> 
> I’ve seen mentioned here and there that the conditional functions in xparse
> are now considered inappropriate. I wanted to get some clarification about
> that. For example, if I have the command
> 
> \NewDocumentCommand \foo { s m }
>    {
>      \IfBooleanTF { #1 }
>        { \mymodule_foo_star:n { #2 } }
>        { \mymodule_foo_nostar:n { #2 } }
>    }
> 
> is it now preferrable to define it as
> 
> \NewDocumentCommand \foo { s m }
>    { \mymodule_foo:nn { #1 } { #2 } }
> 
> and have \mymodule_foo:nn do the conditional handling internally?
> 
> Warmly,
> Kelly
> 

Hi Kelly,

The idea of xparse remains the same: separating document syntax from 
code/implementation. Most of the time, document-level switches will link 
with different code-level interfaces. So I'd expect to see the 
\IfBooleanTF approach in most cases. Of course, where there is a 
code-level interface which takes a boolean, the second approach may be 
useful, but less common.

Joseph