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I’ve given Rubyisms in Rails a quick skim.

It’s an excellent book for someone who knows the basics of Ruby and wants to learn a little bit about how Rails is influenced by Ruby’s language design. You’ll find out why symbols are used, why and how 30.seconds.ago

I like how it compares Java/C++ to Ruby—for example, it shows you how you’d implement the Iterator pattern in C++ and Java, and then shows the Ruby and Rails way of doing it.

I’d recommend this book for anyone who, again, knows the basics of Ruby and wants a quick and concise read on how to use Ruby’s best features.