[Haskell-beginners] Fwd: My first functioning haskell project - a steganography utility

[Brandon S Allbery KF8NH]

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On 7/13/10 11:20 , Tim Cowlishaw wrote:
> actually, looking at it again, it'd be something like
> 
> maybeMonoid :: (Monoid a) =>  Maybe a -> Maybe a -> a
> maybeMonoid ::  x y = (fromMaybe mempty x) `mappend` (fromMaybe mempty y)

Which in turn can be written as:

> maybeMonoid = mappend `on` (fromMaybe mempty)

("on" is in Data.Function:  "g `on` f" expresses the "\x y -> (f x) `g` (f
y)" idiom.)

- -- 
brandon s. allbery     [linux,solaris,freebsd,perl]      allbery at kf8nh.com
system administrator  [openafs,heimdal,too many hats]  allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university      KF8NH
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