MultiThread

To use compute method

   var result = await compute(computeFactorials, 1000);

To use isolate method

   var result = await _runIsolate(1000);

Isolate runner function

 Future<int> _runIsolate(int limit) async {
   final receivePort = ReceivePort();
   await Isolate.spawn(_isolateEntry, [receivePort.sendPort, limit]);
   return await receivePort.first;
 }

Entry function for Isolate

 void _isolateEntry(List<dynamic> args) {
   final sendPort = args[0] as SendPort;
   final limit = args[1] as int;
   final result = computeFactorials(limit);
   sendPort.send(result);
 }

The isolate runs the computeFactorials function in the background and sends the result back to the main thread, which is then displayed in the UI.

Heavy task Method

 int computeFactorials(int limit) {
   int sum = 0;
   for (int i = 1; i <= limit; i++) {
   sum += factorial(i);
   }
 return sum;
 }