BadFL Example Code (helper/throttle)

main.dart

import 'dart:async';

class BadThrottler {
  /// default action to be called when the throttler is called without a action
  final FutureOr<void> Function()? defaultAction;

  bool _running = false;

  BadThrottler({this.defaultAction});

  Future<void> call([FutureOr<void> Function()? action]) async {
    if (_running) return;

    assert(
      action != null || defaultAction != null,
      'can only call throttler without action when defaultAction is provided',
    );

    _running = true;
    await (action ?? defaultAction)!();
    _running = false;
  }
}

void main() async {
  final throttler = BadThrottler(defaultAction: () async {
    await Future.delayed(const Duration(milliseconds: 500));
    print('default action');
  });

  // call the default action
  throttler();

  // this call will be ignored
  throttler(() async {
    print('hello');
  });

  // call with a custom action
  await Future.delayed(const Duration(seconds: 1));
  throttler(() async {
    print('hello again');
  });
}

// Output:
// default action
// hello again