Invisible wrote:
>   filter odd [1, 2, 3, 4]
> It filters out the *even* numbers.

Yes. And the odd numbers stay behind in the filter. If you filter out coffee 
grounds, what do you have when you're done? Grounds, or coffee?

The problem with a real filter is it separates, rather than selects. When 
you filter coffee, are you filtering the grounds or the drinkable stuff? 
Neither: you're separating the two.

I'm kind of surprised "filter" doesn't return both, given it would seem 
(semantically) fairly easy not to calculate whichever half doesn't get used.

-- 
   Darren New, San Diego CA, USA (PST)
   The NFL should go international. I'd pay to
   see the Detroit Lions vs the Roman Catholics.

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