<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><br></div><div><br>On 09 Jan 2014, at 20:52, Vlatko Basic <<a href="mailto:vlatko.basic@gmail.com">vlatko.basic@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div>
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Hi Brandon,<br>
<br>
> ... you did not think out your program sufficiently beforehand
...<br>
Yes, that is quite possible. I consider myself an FP beginner still.<br>
I encountered that mixing Maybe and Either problem few months ago
and I think it was about using parseUri and simpleHTTP and I had to
`case` them separately to provide a meaningful error message.
Haven't been able to simply chain them. In other words, it was not a
nice looking function. <br>
Maybe today I'd write it differently.<br></div></blockquote><div><br></div><div>I suggest taking a loon at the 'errors' package mentioned earlier in this thread, it somewhat simplified my issues with unifying Maybe/Either/EitherT</div><br><blockquote type="cite"><div>
<br>
> ... what exactly is the problem with using appropriate data
types in appropriate places ...<br>
It is a good thing. Very good. But I do not think all library
writers are using it in correct places. But that's another problem.<br>
<br>
<br>
vlatko<br>
<br>
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<div class="moz-cite-prefix">-------- Original Message --------<br>
Subject: Re: [Haskell-cafe] Why Maybe exists if there is
Either?<br>
From: Brandon Allbery <a class="moz-txt-link-rfc2396E" href="mailto:allbery.b@gmail.com"><allbery.b@gmail.com></a><br>
To: Vlatko Bašić <a class="moz-txt-link-rfc2396E" href="mailto:vlatko.basic@gmail.com"><vlatko.basic@gmail.com></a><br>
Cc: Johannes Erber <a class="moz-txt-link-rfc2396E" href="mailto:Hannes_E@gmx.de"><Hannes_E@gmx.de></a>,
<a class="moz-txt-link-rfc2396E" href="mailto:haskell-cafe@haskell.org">"haskell-cafe@haskell.org"</a> <a class="moz-txt-link-rfc2396E" href="mailto:haskell-cafe@haskell.org"><haskell-cafe@haskell.org></a><br>
Date: 09.01.2014 17:32<br>
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<br>
<br>
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<div class="gmail_quote">On Thu, Jan 9, 2014 at 11:25 AM,
Vlatko Basic <span dir="ltr"><<a moz-do-not-send="true" href="mailto:vlatko.basic@gmail.com" target="_blank">vlatko.basic@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
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<div style="" bgcolor="#FFFFFF" text="#000000">> ... is
letting the programmer do what they need to do with a
minimum of fuss or extra work ...<br>
But doesn't the need of mixing Maybe and Either cause
more work for the programmer? Programmer of library, or
programmer using the library?<br>
</div>
</blockquote>
<div><br>
</div>
<div>Arguably if you need to switch from Maybe to Either
then you did not think out your program sufficiently
beforehand. And if you did think it out, what exactly is
the problem with using appropriate data types in
appropriate places?</div>
<div><br>
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-- <br>
<div dir="ltr">
<div>brandon s allbery kf8nh
sine nomine associates</div>
<div><a moz-do-not-send="true" href="mailto:allbery.b@gmail.com" target="_blank">allbery.b@gmail.com</a>
<a moz-do-not-send="true" href="mailto:ballbery@sinenomine.net" target="_blank">ballbery@sinenomine.net</a></div>
<div>unix, openafs, kerberos, infrastructure, xmonad <a moz-do-not-send="true" href="http://sinenomine.net" target="_blank">http://sinenomine.net</a></div>
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