Preface
This is the fifth edition of Programming Ruby, which many Ruby developers call “The Pickaxe Book.” It covers Ruby up to and including Ruby 3.3.
Since the previous edition of this book, Ruby has continued to grow and evolve. New syntax has been added; old syntax has been refined. Major new features, such as pattern matching and type signatures, are now part of the language. Tools that didn’t exist or were in their early stages of development then are now in constant use by Ruby developers around the world. The entire ecosystem is thriving.
The Pickaxe Book continues to be your guide to learning Ruby the language and understanding how Ruby’s parts work together and how you can use the most popular and important Ruby tools.
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