forall quantifier

[Tomasz Zielonka]

On Wed, Jun 04, 2003 at 02:46:59PM +0200, Markus.Schnell@infineon.com wrote:
> 
> Now I want to print part of the record. What I would like to do is the
> following
> > putStrLn $ concatMap show [a,c,d]
> 
> !!! bang !!!
> 
> So what I actually do is 
> > putStrLn $ concat [show a, show c, show d]
> 
> Works, but a little bit clumsy, especially with long lists.
> Is there a nice solution?

You can do something like this:

  infixr 5 +++

  (+++) :: Show a => a -> [String] -> [String]
  a +++ l = show a : l

  concat $ a +++ b +++ c +++ []

Best regards,
Tom


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