[Haskell-cafe] Java - Haskell adjustment

pierre k.pierre.k at gmail.com
Mon Oct 15 11:16:08 EDT 2007

On Mon, Oct 15, 2007 at 03:49:44PM +0100, Ryan Bloor wrote:
> Hi, its Ryan here...
> I've just come from an intensive course in java and have been thrown into the imperative world of haskell. 
> The problem that I have is extremely simple in java but I am having trouble adjusting my old mindset. 
> A multiset is a collection of items. 
> Each item may occur one or more times in the multiset. All items are of the same type. 
> The scenario we could use is a students' grades for their A levels: 3A, 4B and 2C grades for our pupil 'x'. 
> A multiset may be implemented by a list... so ['A', 'A', 'A', 'B', 'B', 'B', 'B, 'C', 'C'] but this very ineffiecient and tedious. 

You might try, for example, rle encoding : [(3, 'A'), (4, 'B'), (2, 'C')]. Don't know if this would be more efficient for your task, but if you wish to 'just optimize something' you can give that a try.
> How might one set out into putting this into action.... thanks...
> Any help that complements my ideas is welcome
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