[Haskell-cafe] IO Help

[Mark Wallsgrove]

Thank you all for your help, you have been invaluable

Thomas Davie wrote:
> 
> On 8 May 2008, at 16:31, Mark Wallsgrove wrote:
> 
>> Was there? I have been google'ing that problem for ages..
>>
>> Just one more thing. I have to make a menu system where the user 
>> chooses what functionality they want. Because you cannot change a 
>> value once it is set I have used recursion so that when something 
>> changes it then calls the menu back up. I feel this is way to memory 
>> consuming. Is there another way?
> 
> While this method feels like it should consume lots of memory, it in 
> fact doesn't.  Remember that you're dealing with a graph machine, and 
> that no stack is maintained of all the calls you've made.  The garbage 
> collector will simply follow you through the menu system clearing up the 
> memory behind you.
> 
> Bob
>