Can you explain the principle of the debounce method in RxDart and its purpose?

The debounce method in RxDart is used to filter events in a data stream so that only those events that are not "overridden" by subsequent events within a specified time interval are passed through. This means that if events occur too frequently, debounce will wait for a pause between them, and only after no new event appears for the specified time will it pass the last event further.

This is useful, for example, when processing user input, to avoid reacting to every keystroke, and instead only respond after the user has stopped typing for a certain period.

Example of usage:

import 'package:rxdart/rxdart.dart';

void main() {
  final subject = PublishSubject<String>();

  subject
      .debounceTime(Duration(milliseconds: 300))
      .listen((value) => print('Debounced: $value'));

  subject.add('H');
  subject.add('He');
  subject.add('Hel');
  // If these events occur within less than 300 ms, only the last 'Hel' will be printed
}