Check out this info
http://en.wikibooks.org/wiki/Haskell/Hierarchical_libraries/Maybe


On Tue, May 14, 2013 at 11:21 AM, Adrian May <adrian.alexander.may@gmail.com> wrote:
Hi there,

I have a really annoying scrap of code:

unmaybe Nothing = mempty
unmaybe (Just dia) = dia

It happened because I'm using Diagrams but building my diagram requires looking something up in a list using findIndex, which returns Maybe Int.

How do I rid myself of this blotch?

TIA,
Adrian.



_______________________________________________
Beginners mailing list
Beginners@haskell.org
http://www.haskell.org/mailman/listinfo/beginners