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My own attempt at implementing something like transducers in Haskell: http://hackage.haskell.org/package/foldl-transduce.

It depends on the useful "foldl" library of reducers.

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This looks really useful!

Isn't your Transduction the same as doing premap (or lmap from Profunctor)?

Transformations created with premap are stateless, they depend only on the current input. So one can't build UTF8 decoders with them, for example. That said, if you supply a function to premap, the result typechecks as a "Transduction".

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