exposition on arrows in haskell

Question

What would be a good place to go to understand arrows? Ideally, I am just looking for some place with a concise definition with motivation from some good examples, something similar to Wadler's exposition on monads.

Answer 1

http://en.wikibooks.org/wiki/Haskell/Understanding_arrows

Answer 2

I found Hughes' original paper ("Generalizing Monads to Arrows") to be fairly accessible. You can read an older draft of it here . It has some differences from the original paper, which are noted on the bibliography page of Ross Patterson's own overview of Arrows .

Answer 3

If you learn better from practice than theory, try using HXT for XML manipulation, or PArrows for general parsing. They both have APIs centered around arrows.