nodeify 1.0.0-dev

a nodejs-like Event Listener/Event Emitter library

example/example.dart

import 'package:nodeify/nodeify_events.dart';

/** 
 * note the usage of the [data] parameter, 
 * even though there is no other parameter used 
 */
void test([data]) {
  print("Hello world.");
}

/** 
 * note the usage of the [data] parameter, as it is the last 
 * parameter in the list, after the parameter that is actually 
 * needed
 */
void test1([counter, data]) {
  print("$data has been called $counter times.");
}

/// note the async usage
/// for consistency, ALL methods in this library should be await-ed
/// however, it is most important for `.emit()` and `.removeListener()`
main() async {
  EventEmitter evt = EventEmitter();
  
  //no user-defined args, as only data was provided in the function definition
  await evt.on("test", test); 
  
  /// one user-defined arg, for the [counter] param. This should be
  /// an array with parameters you defined - everything except for data
  await evt.on("test1", test1, [5]); 

  await evt.emit("test"); /// prints: Hello world.
  await evt.emit("test"); /// prints: Hello world.
  await evt.removeListener("test", test); /// returns nothing
  await evt.emit("test"); /// returns nothing
  print(
      "test Listener has been removed - 3 emits were called, but only 2 were executed because of the .removeListener()");

  await evt.emit("test1"); /// prints: test1 has been called 5 times.
  await evt.emit("test1"); /// prints: test1 has been called 5 times.
  await evt.emit("test1"); /// prints: test1 has been called 5 times.
  await evt.removeListener("test1", test1); /// returns nothing
  await evt.emit("test1"); /// returns nothing
  print(
      "test1 Listener has been removed - 4 emits were called, but only 3 were executed because of the .removeListener()");
}