Advanced reactivity

Now that we've warmed up a bit, let's discuss reactivity in a bit more detail. As we've already learned, reactive functions and objects automatically take dependencies on their inputs. We've also seen that it's often a good idea to use reactive objects rather than just output functions because data objects can be created once and then passed around to different output functions. We're now going to discuss, in a bit more detail, the use of reactive objects in Shiny as well as special functions within it to control reactivity. There is more about reactivity and some very helpful diagrams on the Shiny tutorial pages at http://rstudio.github.io/shiny/tutorial/#reactivity-overview.

The default behavior, as we have seen throughout ...

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