shiny-lessons.org

Empirical Notes on Shiny

• It used to be better for Shinyscreen to retain the bare minimum of observers and keep as much of functionality as possible inside reactive functions. The fluidity of UI experience was reported to be better. Probably the logic of the application got better, too. But, going full reactive can sometimes be exhausting. These days, we build some stuff inside observers. All in moderation, though.
• Assignment to a reactive value does not add a dependency on that value.
• A reactive values list is not adding a dependency on all its members. Not even if it was nested inside some other reactive values list.
• An ordinary list inside reactive values list, if used, will add dependency on all its members. Even if only some of its members are used, the dependency is on all the members.