Thought about learning object-oriented programming, and in particular the Ruby language? With a free book, life will be easier.
LifeHacker has
posted a short note about a free book available
online or
for download (pdf) for those who are starting to learn Ruby.
The book in a light and humorous form introduces the world of Ruby. Chapter Zero is titled simply and without frills: "What are you talking about, Mr.?"
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In the comments on LifeHacker, visitors remembered two more books: