What is the purpose of the callback in this utility function?
function debounce(fn, delay, callback) {
let timeoutId;
return function(...args) {
clearTimeout(timeoutId);
timeoutId = setTimeout(() => {
const result = fn.apply(this, args);
callback(null, result);
}, delay);
};
}
The callback in this debounce implementation provides asynchronous access to the debounced function's result. Benefits: 1) Allows handling the result after the debounce delay, 2) Maintains asynchronous flow control, 3) Enables error-first callback pattern compatibility, 4) Provides a way to process the result without modifying the original function, 5) Separates result handling from the debounce logic. This pattern is useful when debounced operations need to provide their results to other parts of the application.