Monad Maybe?

[Russell O'Connor]

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[To: haskell-cafe@haskell.org]

Is there a nicer way of writing the following sort of code?

case (number g) of
 Just n -> Just (show n)
 Nothing ->
  case (fraction g) of
   Just n -> Just (show n)
   Nothing ->
    case (nimber g) of
     Just n -> Just ("*"++(show n))
     Nothing -> Nothing

- --
Russell O'Connor                           roconnor@math.berkeley.edu
           <http://www.math.berkeley.edu/~roconnor/>
``Any time you skip a commercial [...] you're actually stealing the
programming'' -- Jamie Kellner, CEO of TBS

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