Acknowledgments

Many people have contributed to what’s good in this book. The problems and errors that remain are the authors’ alone.

Thanks to everyone at the Pragmatic Bookshelf. Thanks to Dave Thomas and Andy Hunt for creating a fun platform for writing technical books and for betting on the passions of their authors.

Thanks to our editors, Jackie Carter, Katie Dvorak, Susannah Davidson Pfalzer, and especially Andrea Stewart. Their advice made the book way better.

Thanks to our technical reviewers for all your comments and helpful suggestions, including Antonio Cangiano, Brian J. Cardiff, Pieter-Jan Coenen, Ashish Dixit, Kevin Gisi, Derek Graham, Gábor László Hajba, Michael Keeling, Nigel Lowry, Dary Merckens, Sean Miller, Russ Olsen, Frank Ruiz, Peter Schols, Gianluigi Spagnuolo, and Tom Verbesselt. Your remarks made this book so much better.

Thanks to all the people who posted suggestions in the forum and on the book’s errata page.

Thanks to Ary Borenszweig and the Crystal developers team for creating this marvelous language and fostering a community around it.

Thanks to Ivo’s wife, Christiane, for endless love and encouragement, and to Simon’s wife, Angelika, who supported his exploration of new paths.

We hope that this book will be your guide for adding Crystal to your toolbelt and encourage you to start your own Crystal projects!

Happy Crystalling ♥