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Stops a reactive expression or output from executing until all required inputs have non-null values.
Distinct from Reactive Inputs: Distinct from Reactive Inputs: focuses on guarding execution against missing inputs, not on passing reactive data via handles.
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Shiny is a framework for building interactive web applications using R code, eliminating the need for HTML, CSS, or JavaScript. At its core, it provides a reactive programming model that automatically tracks data dependencies and re-executes only the parts of an application that depend on changed inputs. The framework handles server-side UI rendering and maintains persistent WebSocket connections between the browser and server for real-time updates without page reloads. The framework distinguishes itself through deep integration with the R ecosystem, including the ability to embed interactive
Stops reactive expressions from executing until all required inputs have non-null values.