<div dir="ltr">FWIW I've added this to data-extra <a href="http://chrisdone.com/data-extra/Data-Bool-Extra.html">http://chrisdone.com/data-extra/Data-Bool-Extra.html</a> for the meanwhile.<br></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On 11 September 2013 00:02, Oliver Charles <span dir="ltr"><<a href="mailto:ollie@ocharles.org.uk" target="_blank">ollie@ocharles.org.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello,<br>
<br>
I would like to propose that the following is added to Data.Bool in base:<br>
<br>
bool :: a -> a -> Bool -> a<br>
bool f _ False = f<br>
bool _ t True  = t<br>
<br>
(Aka, bool f t b = if b then t else f)<br>
<br>
The purpose of this is hopefully evident from its definition. I find<br>
myself reaching for this in cases similar to where I would use 'maybe' -<br>
often when I'm working with 'fmap' and don't want to start introducing<br>
names for the function I am using to map over some functor.<br>
<br>
I suggested this in #haskell and other people also seem frustrated this<br>
doesn't exist, and would like to see it happen - hopefully they will<br>
voice their support as a reply here.<br>
<br>
A quick search on FPComplete's Hoogle [1] shows five equivalent<br>
functions on the first page - and I'm sure there are more on subsequent<br>
pages.<br>
<br>
Thoughts?<br>
- ocharles<br>
<br>
---<br>
[1]:<br>
<a href="https://www.fpcomplete.com/hoogle?q=Bool+-%3E+a+-%3E+a+-%3E+a&env=ghc-7.4.2-stable-13.09" target="_blank">https://www.fpcomplete.com/hoogle?q=Bool+-%3E+a+-%3E+a+-%3E+a&env=ghc-7.4.2-stable-13.09</a><br>
<br>
<br>_______________________________________________<br>
Libraries mailing list<br>
<a href="mailto:Libraries@haskell.org">Libraries@haskell.org</a><br>
<a href="http://www.haskell.org/mailman/listinfo/libraries" target="_blank">http://www.haskell.org/mailman/listinfo/libraries</a><br>
<br></blockquote></div><br></div>