Hello,
I am soon to be in my final year at university and am looking for some good
ideas for a final year project, relating to HUGS or Haskell. Any ideas?
Thanks
Andrew
> ----------
> From: Rainer Joswig[SMTP:[EMAIL PROTECTED]]
> Sent: 10 June 1999 12:40
> To: [EMAIL PROTECTED]
> Subject: Re: how to write a simple cat
>
> At 16:37 Uhr +0200 09.06.1999, Friedrich Dominicus wrote:
>
> > > I think exercise with the purely functional, non-I/O core (and perhaps
> > > interact like someone else suggested) teaches you the mode of
> > > thinking in purely functional languages. That thinking can also
> > > help you understand the way I/O is implemented in a referentially
> > > transparent way.
> >
> >I disagree, small scripts spend most of the time doing I/O if I don't
> >understand how to do that I'm not able to even write the most simple
> >things. This is eg. true for my cat ...
>
> I disagree. You need to know more about Functional Programming
> (and also the Haskell type system and its IO system) before
> you should try to solve your problems. It's like you want
> to drive without knowing anything about the engine, brakes, ...
>
> There are many great introductory books which would
> give you an idea about some of the basic building blocks
> of "functional" software development. I don't think
> "Haskell" is the problem - it's the way of thinking - you
> need to "unlearn" previous knowledge about coding
> algorithms. For your pleasure ;-) , lazy FP code in Lisp:
>
> (defun longerThan (filename lenlim)
> (series:iterate ((l (series:choose-if
> (lambda (l) (> (length l) lenlim))
> (series:scan-file filename #'read-line))))
> (print l)))
>
> Which is really similar in spirit to Hannah Schroeter's:
>
> longerThan :: String {- filename -} -> Int {- length limit -} -> IO ()
> longerThan fn lenlim = do
> content <- readFile fn
> let li = lines content
> fl = filter (\l -> length l > lenlim) li
> putStr (unlines fl)
>
> I think both versions are really simple to write.
>
>
> Rainer Joswig, "Lavielle" EDV Systemberatung GmbH & Co. KG, Lotharstrasse
> 2b,
> D22041 Hamburg, Tel: +49 40 658088, Fax: +49 40 65808-202,
> Email: [EMAIL PROTECTED] , WWW: http://www.lavielle.de/
>
