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If you want to learn "functional" aspect and not only library and syntax, I would recommend SICP.

How much of this book is "functional" aspect and how much is everything else? Going through the TOC, it looks like the book tries to start from 0.

Would you recommend any particular sections for someone who's looking to only understand the functional parts?

Your comment tells me you should start from the beginning and read the whole thing. :)

Just give it a try. I was hooked after first chapter!

atleast go through initial 4 chapters. then go through the coursera lecture of Odersky. Though SICP is lisp, the structure is very similar to scala.