[Haskell-cafe] monadic MapReduce
dave at zednenem.com
Tue Mar 3 18:20:53 EST 2009
On Mon, Mar 2, 2009 at 6:57 PM, Anish Muttreja <anishmuttreja at gmail.com> wrote:
> How about this. Is there a reason why I can't
> replace the variables b and c in the type signature of mapReduce with with (IO b')
> and (IO c'). b and c can be any types.
> mapReduce :: Strategy (IO b') -- evaluation strategy for mapping
> -> (a -> IO b') -- map function
> -> Strategy (IO c') -- evaluation strategy for reduction
> -> ([IO b'] -> (IO c')) -- reduce function
> -> [a] -- list to map over
> -> (IO c')
> Just remember to wrap all values back in the IO monad.
This is possible, but it probably won't do what you want. The input to
the reduce function will be a list of "IO a" values, not the results
of performing the IO.
Dave Menendez <dave at zednenem.com>
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