From The Well-Grounded Rubyist, Third Edition by Joseph Leo and David A. Black

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The Well-Grounded Rubyist, Third Edition is a perfect tutorial for newcomers to Ruby and a great way for experienced Rubyists to deepen their understanding of the language. This thorough book starts with Ruby fundamentals and offers an in-depth guide to all major language features. In this newly-revised third edition covering Ruby 2.5, expert authors David A. Black and Joe Leo make even familiar concepts seem new and interesting. The slide deck below has more about the book.