Acknowledgements

I would like to extend my thanks to everyone who has paid for this book. Your payment, no matter how big, gives me encouragement to keep working on this book.

I would like to thank my friend, Paweł, who kind of pushed me into actually doing this.

A big thank you to Yukihiro Matsumoto for creating Ruby back in 1993 so that I could discover it two decades later.

I welcome suggestions for future revisions of this book.