The book itself is constantly updated by the author and community, people add particular language flavors. Scala flavor[1] (along with the original Haskell one) is already part of the book, OCaml flavor[2] is being worked on and mostly finished.

[1] https://github.com/hmemcpy/milewski-ctfp-pdf/releases/tag/v1...

[2] https://github.com/hmemcpy/milewski-ctfp-pdf/pull/201