Scalaz is a Scala library that gives you Haskell in Scala.<p>I&#x27;ve got exactly two imports I require for every Scala project - Scalaz and Scalacheck (quickcheck style testing lib).<p>Also very nice, albeit slow, is scalaz stream.<p><a href="https:&#x2F;&#x2F;github.com&#x2F;scalaz&#x2F;scalaz-stream" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;scalaz&#x2F;scalaz-stream</a>