[Haskell-cafe] IO Help

[Daniel Fischer]

Am Donnerstag, 8. Mai 2008 14:59 schrieb Mark Wallsgrove:
> Thank you very much for your fast response!
>
> Ok, that is now changed, but everything else in my program is expecting
> Catalogue without IO. Is there a way to change IO Catalogue into Catalogue?
>
Not a recommendable way. But there's no need to, your programme will probably 
look like

main = do
	args <- getArgs
	let realArgs = parseArgs args
	catalogue <- loadData
	doSomething realArgs catalogue

and doSomething might e.g. construct an updated catalogue and write it to a 
file.