This chapter gave you the tools necessary to write the client-server Dart applications that store their data in the server databases. You learned how to work with command-line arguments by using the Options class, and how to work with files, storing data in the JSON format. We stored our data in a typical relational database (MySQL), using the sqljocky driver for Dart. Then, we gave you an introduction to the document database system MongoDB, and showed you how to use it from a Dart app with the mongo_dart connector.

This brings us to the end of our Dart journey in this book. We hope you've enjoyed it as much as we enjoyed developing the code and writing the text for it. You now have the tools to develop all sorts of apps using Dart. Join the Dart community and start using your coding talents! Perhaps, we'll meet again in the Dartiverse.