void main() {
  var futureObject = getPostFromServer();
  printPost(futureObject);
}

getPostFromServer() async {
  var duration = Duration(seconds: 5);
  var computation = () {
    return "You will get it in future";
  };

  var futureObject = await Future.delayed(duration, computation);
  return futureObject;
}

printPost(var futureObject) async {
  print(await futureObject);
}