Iteratee

Iteratees were pretty hard concept to grasp for me. Thanks to nice article http://mandubian.com/2012/08/27/understanding-play2-iteratees-for-normal-humans/ I managed to understand what it is and how it works, but event then it wasn’t clear for me why one may need it - mentioned features seem to be achievable with simpler tools like Scala lazy Streams (http://scala-lang.org/api/current/#scala.collection.immutable.Stream) and RxScala observables (http://reactivex.io/documentation/observable.html): Backpressure (produce data with such speed that consumer has time to process it) - lazy Streams do exactly this thing: element of Stream isn’t evaluated until someone attempts to retrieve it.