IO is the trickiest of operations to tackle in a functional way. Try to make IO efficient, non-leaky, composable, and pure, and the problem becomes virtually unsolvable.
In this talk, John A. De Goes, CTO at Precog, discusses three different approaches to functional IO in Scala, beginning with iteratees, and continuing on to stream processors and transducers.
John's Slides:
The Northeast Scala Symposium is a yearly gathering of the Scala community, made possible by efforts of Boston, Philadelphia and New York Scala enthusiasts.