The Well-Grounded Rubyist 3rd Edition
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About the Author
Ruby teacher and advocate Joseph Leo III is the founder of Def Method and lead organizer of the Gotham Ruby Conference.
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Here's my beef--it's hard to read this book as a beginning. It's also hard to read it as someone with a few years of experience in Ruby. There were a few delightfully rich pieces of new information in this book, and a few other areas where I learned more about something that I already knew. However, there were also a lot of boring "string.reverse will reverse a string" sort of examples that felt like a waste of my time.
I have seen a few textbooks do a better job of highlighting which areas are best for beginnings, and which are best for more experienced readers. I wish this book had better organized its content in that way.
From a content perspective, I think my only criticism is the lack of information on structures. There's one spot in the book where they foreshadow that they will talk more about structures, but then they never get around to it, as far as I can recall.
The bootstrapping section describes the language design at a level of detail that an experienced programmer like me wants. The endless tutorials on line wasted so much time. This is infinitely better. It should be your first book if starting Ruby with a strong programming background