The Pragmatic Bookshelf | Seven Languages in Seven Weeks. Check this book out, concise neat examples. Author def. sets the pace right at the introduction saying this is not for learning each languages. Ruby discussion is great, you always want to learn Scala and how it supports concurrent programming. Perfect way to kick start what one wants to learn. We will try to get some example and interoperate with all languages discussed in the book. Seriously great effort and good book. Have fun.