This repo contains a small demo app that illustrates one way to work with cookies within a Shiny app.
All the real work is offloaded to javascript with information being passed
back into the app through Shiny's javascript interface, specifically,
Shiny.onInputChange().
This aproach is very lightweight, but other approaches also exist such as the cookies package, which you may prefer.
Run the app.R file (Mac and Linux users can also start the app with the
app.sh script) to see an interactive demo of the cookie handling.
Besides the app.R file, the only other requirement is the www/cookies.js
javascript file. This contains some helper functions for use in the embedded
javascript that's inline in app.R.