[dart] Measure execution time of an async function

[Katipunero-]

void main() async {
  print('Started.');
  Stopwatch stopwatch =  Stopwatch()..start();
  String x = await helloAsync();
  print(x);
  print('helloAsync() executed in ${stopwatch.elapsed}');
 
}
Future<String> helloAsync() async{
   await Future.delayed(Duration(seconds:5));
   return 'Message from Future.';
}

Output:
Started.
Message from Future.
helloAsync() executed in 0:00:05.016700