[Haskell-cafe] Nice way to calculate character frequency in a string

[Ketil Malde]

Scherrer, Chad wrote:

>Sorry to drag this thread out, but here's one more thing you might
>try...
>  
>
(This is the café, isn't it? :-)

Another option is perhaps to pack both char and count in one Int and use 
some kind of Set.
This should save some space, and possibly time as well (presuming 
bitwise ops are less expensive
than pointer dereferences, which I believe have been a safe assumption 
since the mid-90s), but requires a Set being searchable for ranges.  (Do 
any of the implementations support this, BTW?)

-k