I'm curious to know what the biggest or most interesting-to-you changes were with this edition - were you excited to jump into new language features, or to rethink how you'd approached existing ones?
Also - this looks like a book that might have been pretty helpful to me a few years ago when I needed to refresh my Ruby knowledge after a break, and it looks like it'll be useful now as I am trying to scrape a bit of the rust off my Ruby knowledge. Wish I'd come across it earlier!
Very glad you’re finding the book helpful! One big change was the addition of an entirely new chapter on functional programming in Ruby. The book was brought up to date for Ruby 2.5, and lots of examples and exercises were revised or added. A lot stayed the same but the whole book got a big facelift!
Ruby training coming up in September! David A. Black and Erik Kastner team up for fast-paced, four-day Ruby intro, in New Jersey, September 14-17. See http://rubyurl.com/vmzN or contact David.