Mastering RStudio – Develop, Communicate, and Collaborate with R

The concept of reactivity

Shiny uses a reactive programming model, and this is a big deal. By applying reactive programming, the framework is able to be fast, efficient, and robust. Briefly, changing the input in the user interface, Shiny rebuilds the related output. Shiny uses three reactive objects:

• Reactive source
• Reactive conductor
• Reactive endpoint

For simplicity, we use the formal signs of the RStudio documentation:

The implementation of a reactive source is the reactive value; that of a reactive conductor is a reactive expression; and the reactive endpoint is also called the observer.

The source and endpoint structure

As taught in the previous