Learn how to build robust web applications with JavaScript by following design patterns outlined in the book. The book teaches experienced developers how to write flexible and resilient code that is easier to work with as the code base grows. By separating the application into different layers, organizing code efficiently, and building self-describing APIs, developers can add features without breaking the rest of the code. The book also covers best practices for testing, integrating, and deploying software updates quickly, as well as controlling resource access and expanding the application's reach through internationalization.