How to pass arguments (besides SendPort) to a spawned isolate in Dart

Question

In this article, they spawned an isolate like this:

import 'dart:isolate';

void main() async {
  final receivePort = ReceivePort();
  final isolate = await Isolate.spawn(
    downloadAndCompressTheInternet,
    receivePort.sendPort,
  );
  receivePort.listen((message) {
    print(message);
    receivePort.close();
    isolate.kill();
  });
}

void downloadAndCompressTheInternet(SendPort sendPort) {
  sendPort.send(42);
}

But I can only pass in the receive port. How do I pass in other arguments?

I found an answer so I'm posting it below.

Answer 1

We can get back the type safety by creating a custom class with fields

class RequiredArgs {
   final SendPort sendPort;
   final int id;
   final String name;

   RequiredArgs(this.sendPort, this.id, this.name);
 }

void downloadAndCompressTheInternet(RequiredArgs args) {
  final sendPort = args.sendPort;
  final id = args.id;
  final name = args.name;

  sendPort.send("Hello $id:$name");
}

Code will be much cleaner and safer in this way ?