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Thanks for your interest in Becoming Functional. On page v of this title it describes the languages being used as such:
"Java - I assume that all readers are familiar with the Java syntax. The version used
in this book is 1.7.0.
• Groovy - This language allows us to keep most of our existing Java syntax; this helps us begin our transition into a fully functional language. I’ll explain the main parts of the Groovy syntax as they are needed. The version used in this book is 2.0.4.
• Scala - A fully functional language which we will slowly be transitioning into. As
with Groovy, I will explain the syntax as we introduce it. The version used in this
book is 2.10.0."
I hope this helps and have a great day!
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