handlerFunction

A handler function is a programming construct that is designed to respond to a specific event or request. It is a piece of code that is executed when a particular condition is met, such as a button click, a network request arriving, or a timer expiring. The primary purpose of a handler function is to encapsulate the logic for dealing with such occurrences, making the overall program structure more organized and manageable.

In many programming paradigms, handler functions are associated with event-driven programming models. When an event occurs, the system identifies the appropriate handler function and passes it any relevant data associated with the event. The handler function then performs the necessary actions, which could involve updating the user interface, processing data, or triggering other system events.

The specific implementation and naming of handler functions can vary significantly across different programming languages and frameworks. However, the underlying concept remains consistent: a dedicated function responsible for managing and reacting to specific events or requests. This modular approach allows developers to isolate concerns and makes code easier to test, debug, and maintain. For instance, in web development, functions that handle HTTP requests are often referred to as request handlers.