All coding examples in this book can be found online at the Pragmatic Programmers web page for this book. You’ll also find a discussion forum where you can ask questions and receive feedback, as well as an errata submission form where issues with the text can be reported.
You are encouraged to get involved with the budding Elixir community and jump aboard to share your knowledge with interested newcomers. Elixir’s website has instructions for getting your system set up as well as helpful links to get involved. The elixir-lang-talk mailing list and the #elixir-lang freenode IRC channel are fantastic resources for fast access to help.