This concept covers the reactive callback model used in declarative UI frameworks (exemplified by Dash for Python): a component tree is expressed as a hierarchy of HTML-like elements, and interactivity is achieved by registering callback functions that declare one or more Inputs (component properties to listen to) and Outputs (component properties to update), such that a change in an Input property automatically triggers re-invocation of the callback and propagation of its return value to the bound Output. This belongs to the domain of declarative, component-based user interface architecture (a paradigm shared with frameworks like React), where UI state is derived from data flow bindings rather than imperative event handlers, and falls within the broader discipline of software design/UI architecture rather than any single language feature.
This concept covers the reactive callback model used in declarative UI frameworks (exemplified by Dash for Python): a component tree is expressed as a hierarchy of HTML-like elements, and interactivi…