[Haskell-beginners] Unmaybe

[Mats Rauhala]

maybe mempty id

On Tue, May 14, 2013 at 05:21:44PM +0800, Adrian May 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.

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-- 
Mats Rauhala
MasseR