[Haskell-cafe] Question on a common pattern
chris at chrisdornan.com
Mon Mar 14 17:12:06 CET 2011
Your first line is entirely natural.
The alternative doesn't look right at all.
I am not aware of a more concise alternative to this general construction
(assuming there are multiple case alternative, and that the work can't be
done with library functions).
From: haskell-cafe-bounces at haskell.org
[mailto:haskell-cafe-bounces at haskell.org] On Behalf Of tsuraan
Sent: 14 March 2011 15:49
To: haskell-cafe at haskell.org
Subject: [Haskell-cafe] Question on a common pattern
In my code, I'm doing this quite a lot:
x <- someIO
case x of
Opt1 -> ...
Having a line for extracting the value from the IO (or STM) and then
acting on the value seems unnatural. Is there a more concise way to
do this? This code:
case someIO of
Opt1 -> ...
Doesn't work, but is there something like that, that is valid?
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