For a list of corrections included is this release, please see errata.
This beta release includes the Haskell chapter, the final language of the seven languages.
This beta release includes a new chapter covering the sixth of the seven languages, Clojure, which is the youngest language in this book and one with a passionate following.
This beta release introduces the Erlang language for the first time. You’ll see some familiar features from the Prolog language, but also a radically different approach to concurrency and reliability. Bruce has also cleaned up much of the errata submitted so far.