Jean-Laurent Huynh (@huynhjl), San Diego Scala Meetup, Thu May 17 1 Introduction1.1 What are Iteratees? An iteratee is a stream processor, it takes a number of elements from an input stream, performs a calculation with them, and returns the value of the calculation. After completion, the elements used by the iteratee should be removed from the stream John W Lato (one of the author of the Haskell i