Dart: Isolate example in a funny way

main.dart

import 'dart:isolate';

//This is the worker
void worker(SendPort request) {
  ReceivePort response = new ReceivePort();
  request.send(response.sendPort);
  response.listen((message){
    print("Boss: $message");
    request.send("....");
    response.close();
  });
}

//This is the boss
main() {
  ReceivePort response = new ReceivePort();
  SendPort request;
  Isolate.spawn(worker, response.sendPort);
  response.listen((message){
    if(message is SendPort) {
      request = message;
      request.send("Ummmm Yeeeahh if you could get this TPS report done today. That'd be great.");
    } else {
      print("Worker: $message");
      response.close();
    }
  });
}