I recently did data (log) analysis with Clojure. So far, really enjoyed it. I use gorilla-repl, which is the reason I picked Clojure in the first place. Be able to use (in browser) REPL to play with data, and display table/charts just using Clojure in browser really helps.

I have studied and still a fan of Haskell, only did some small sideline project with Haskell before. Would love to read this book. and maybe use it in the future.