[Haskell-beginners] consing an element to a list inside a file

[kane96 at gmx.de]

the problem is the function should be
readMyDatatype :: IO MyDatatype
readMyDatatype = do ...
Is it possible to do it somehow different without a parameter?

-------- Original-Nachricht --------
> Datum: Thu, 11 Feb 2010 21:41:15 +0100
> Von: Daniel Fischer <daniel.is.fischer at web.de>
> An: kane96 at gmx.de
> CC: beginners at haskell.org
> Betreff: Re: [Haskell-beginners] consing an element to a list inside a file

> Am Donnerstag 11 Februar 2010 21:09:37 schrieb kane96 at gmx.de:
> > mysecondlist = 0:mylist
> >
> > that's was I was searching for, but how can I add the element to the
> > same list?
> 
> You can't. When you add an element to a list, it's a different list.
> 
> > I have to get any number of inputs from the user and at the
> > end, if he doesn't want to make more inputs, I have to print a list with
> > all the inputs he did.
> 
> Make the list a parameter of the input loop.
> 
> getInputs previous = do
>     user <- getUserInput
>     if endNow user
>       then printList previous
>       else getInputs (user:previous)

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