[Haskell] line-based interactive program

[Colin Runciman]

Christian Maeder wrote:

>>-- a filter program process an entire input to yield some output
>>type FilterProgram = [Line] -> [Line]
>>    
>>
>
>Forget this, if it's not an (old) exercise
>  
>
Yes, people don't write lazy functional programs in Haskell any more. 
In the Era of Monadic Enlightenment, obfuscated imperative programming
is the Way To Go.  :-\  :-)

However, for those who like to indulge the odd moment of nostalgia, in
the Haskell 98 Prelude there is:

interact :: (String -> String) -> IO ()

If this function does not work correctly with the Haskell implementation
you use, do report the fault to the implementors.

Colin R
(purveyor of old exercises)



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