What is the role of runApp ()?

The runApp() function takes the given Widget and makes it the root of the widget tree .

runApp: Run Shiny Application Runs a Shiny application . This function normally does not return; interrupt R to stop the application (usually by pressing Ctrl+C or Esc).

In Dart, main() acts as the entry point for the program whereas runApp() attaches the given widget to the screen . According to this post, it’s possible to establish configuration variables before actually attaching the first widget. This makes the separation between main() and runApp() pretty useful.15 Kas 2019