Mastering Shiny

Part IV. Best Practices

When you start using Shiny, it’ll take you a long time to make even small apps, because you have to learn the fundamentals. Over time, however, you’ll become more comfortable with the basic interface of the package and the key ideas of reactivity, and you’ll be able to create larger, more complex applications. As you start to write larger apps, you’ll encounter a new set of challenges: keeping a complex and growing code-base organized, stable, and maintainable. This will include problems like:

• “I can’t find the code I’m looking for in this huge file.”

• “I haven’t worked on this code in six months, and I’m afraid I’m going to break it if I make any changes.”

• “Someone else started working with me on the application, and we keep standing on each other’s toes.”

• “The app works on my computer but doesn’t work on my collaborator’s or in production.”

In this, the “best practices,” part of the book, you’ll learn some key concepts and tools from software engineering that will help you overcome these challenges:

• In Chapter 17, I’ll briefly introduce you to the big ideas of software engineering.

• In Chapter 18, I’ll show you how to extract code out of your Shiny app into independent apps and discuss why you might want to do so.

• In Chapter 19, you’ll learn about Shiny’s module system, which allows you to extract coupled UI and server code into isolated and reusable components.

• In Chapter 20, I’ll show you how to turn your app in R package and show you ...