R Shiny reactivity

  1. Reactive : define reactive expression that is impacted by input
  2. Observe : similar with print function, which allow the user to observe what is happening inside the app
  3. EventReactive: define reactive expression that is impacted by specific input
  4. ObserveEvent: similar with Eventreactive, while it will not return any value, nor the value could be accessed out side of…

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