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

[Daniel Fischer]

Am Donnerstag 11 Februar 2010 23:04:01 schrieb kane96 at gmx.de:
> but the exercise was nearly complete on the sheet and I just have to
> complete two parts and one of them is to ask the user if he want's to do
> more input. If so, I have to let him input a new value (triple) for
> MyDatatype, otherwise I have to print the list with all triples
>

But to print it, you need to have a reference to the list of inputs. The 
easiest way is to have it as a parameter in the worker loop.

What *exactly* is your task? What is given and what are the specifications 
for a solution?

> >
> > Am Donnerstag 11 Februar 2010 22:34:45 schrieb 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?
> >
> > Separate the worker from the API function.
> >
> > API:
> >
> > readMyDatatype :: IO MyDatatype
> > readMyDatatype = call worker with appropriate arguments
> >
> > worker:
> >
> > readMD :: t1 -> t2 -> ... -> tn -> IO MyDatatype