Dart Async Await Exam

dart_async_await_exam.dart

import 'dart:async';

int a = 0;
void main() async {

  print('first');
  func();
  print('second');
  await func();
  print('third');
}

void func() async {
    await Future.delayed(Duration(milliseconds:1500), ()=> print('--async-- : ${a++}'));
}