Dart Future exam

dart_future_exam.dart

import 'dart:async';

main() async {
  countSeconds(4);
  await message();
}

void countSeconds(s) {
  for(var i=1; i<=s; i++ ) { 
      Future.delayed(Duration(seconds: i), () => print(i));
   }
}

void message () async {
  print('hi');
  var name = await thinking();
  print('bye $name');
}

Future<String> thinking() {
  return Future.delayed(Duration(seconds: 4), () => 'Mr...Kim?');
}