This is working but results are not correct - needs tweaking!

fcfsv3.dart

void main() {
  // function call
  fcfs([
    // then this, secondly
    Task(
    't1', 10, 20,
    ),
    // by rule, this should exec. first
    Task(
    't2', 0, 25,
    ),
    // then this, lastly
    Task(
    't3', 15, 30,
    ),
  ]);
  
  // TODO: add total time taken
}

class Task {
  String taskName;
  int arrivalTime;
  int exeTime;
  
  Task(this.taskName, this.arrivalTime, this.exeTime);
  
  // doTask function
  void doTask(int taskId) {
    // TODO: find ways to automate this potentially long if-else statements
    
    if (taskId == 10) {
      print("task 1 started!");
    } else if(taskId == 0) {
      print("task 2 started!");
    } else {
      print("task 3 started!");
    }
  }
}

void fcfs(List<Task> tasks) async {
  
  // stopwatch
  final stopwatch = Stopwatch();
  // sort
  tasks.sort((a, b) => a.arrivalTime.compareTo(b.arrivalTime));
  
  // todo
  for(Task myTask in tasks) {
    // print(myTask.arrivalTime);
    print(myTask.taskName);
    
    
    // call myTask.doTask and pass arg
    int i = myTask.arrivalTime;
    
    // add next task to queue
    stopwatch.start();
    await Future.delayed(Duration(seconds: 2), () {
      // todo
      print("next task added to queue!");
      stopwatch.stop();
      print("- ${stopwatch.elapsed}");
    });
    print("wait time: ${myTask.exeTime - i}s");
    myTask.doTask(i);
    print("completed in ${myTask.exeTime}s");
  }
  
  print("\n\nall tasks completed!");
}