With this book you can learn Ruby in a breeze. Whether that's more the fault of this book or of Ruby I haven't figured out.

Bought the new version from Pragprog. Added a few errors on the errata list. Don't read this with an iPad. Go try the code samples. Some may not work on 1.9.3. Overall I am happy to have spent time reading "what I assume to have always known" about Ruby. It remains to be the most fascinating language I use. I am happy with how this book is written even if it is obviously not perfect (but looking forward to revisions). Their credits to the Japanese programmers who improve the language is good. Ruby 2.0 would even be better because of GC improvements.

Essential.

This is a pretty awful book. The author has at best a tenuous grasp on object oriented programming. Pick up The Ruby Way instead.

Great book, read the first part to get a good comprehension of the basics of this great language

This is a great intro to learning Ruby.

Old but gold, back to the time where lamdba is frequently called Proc, reflection for the term metaprogramming, not surprising surprisingly Profiler. For me the diamonds are `Object-Oriented Design Libraries` and `Sharing Data Between Ruby and C` makes me think about native approachs POROs more than the go-get a library.

It provides a ground surface for new developer who wanted to step into Ruby, a beautiful interpreter language supporting OOP-first in its design. The patch for this book should be Ancestry chain to know deeper about the inheritance and newer Enum map-reduce for FP paradigm.

There are many ways to achieve a purpose in Ruby, the freedom of choice, to sail a ship into the ocean, to know the vast ocean, to gain the knowledge. Writing Ruby is a joy!

Better for the more advanced programmer / Rubyist. Avoid if you are new to Programming and Ruby. Awesome reference versus tutorial.
This book is all over the map.

If you are an experienced programmer wanting to learn Ruby, this book is for you. A word of warning, though: go take a look at Chapter 27, Metaprogramming. That's the place where the object model of Ruby is explained. Without it, the rest of the book will seem to rely a bit too much on your faith. Unless, of course, you enjoy discovering the truth behind the magic for yourself. I'm sure it is possible and fun, but if you cannot spend the extra time, do take a peek at that chapter.

Another warning: the book (or at least it's ebook version) has quite a few typos, especially in Part 4.

Great book

A very comprehensive look at Ruby and the aspects of the language people seem to enjoy. Explanations on the difference between Ruby 1.9 and previous iterations are also very thorough.

Great reference work that also manages to be a good introduction to the language itself. Not the bets place for Ruby on Rails, but an essential addition to your Ruby library.