Good examples of idiomatic scala code

Question

Scala is a large and complex language. In my experience, the best way to learn such a language is to read really good code. Are there any open source examples of such code? What can you recommend?

Answer 1

1. Scalaz. Be aware that it's written in a far more functional style than most Scala code.

2. Twitter Util (already mentioned in @axel22's answer).