scalaz-stream

Scalaz is a Scala library that gives you Haskell in Scala. I've got exactly two imports I require for every Scala project - Scalaz and Scalacheck (quickcheck style testing lib). Also very nice, albeit slow, is scalaz stream. https://github.com/scalaz/scalaz-stream

Or you could use a library explicitly designed with these considerations in mind, that offers the same powerful, familiar combinators, with resource safety and speed. e.g., Machines in Haskell: https://hackage.haskell.org/package/machines Scalaz Stream in Scala: https://github.com/scalaz/scalaz-stream I've no doubt an equivalent exists for Clojure, too, although I'm not familiar enough with the language to point you in the right direction. One of the most amazing things about writing the IO parts of your program using libraries like these is how easy they become to test. You don't have to do any dependency injection nonsense, as your combinators work the same regardless of whether they're actually connected to a network socket, a file, or whether they're just consuming a data structure you've constructed in your program. So writing unit t

Whatever, https://github.com/ekmett/machines https://github.com/scalaz/scalaz-stream

For high performance/throughput, the JVM beats both Go and Node.js. As an anecdote, I implemented a web service that was handling about 6000 requests per second of real traffic, per EC2 c1.medium server instance. In terms of dealing with concurrency, I/O, reactive stuff and everything else related, you've got: - Actors (local or remote): http://akka.io/ - STM: http://nbronson.github.io/scala-stm/ - Futures/Promises in the standard library: http://docs.scala-lang.org/overviews/core/futures.html - Async (e.g. C#'s async): https://github.com/scala/async - RxJava Observables: https://github.com/Netflix/RxJava - Iteratees: http://www.playframework.com/documentation/2.2.1/Iteratees - Scalaz Streams: https://github.com/scalaz/scalaz-stream And the list can go on.

Scalaz has some nice (usefully typed) concurrency tools: https://github.com/scalaz/scalaz/tree/scalaz-seven/concurren... https://github.com/scalaz/scalaz-stream Like everything with Scalaz, the tools are great but almost completely undocumented.