Immutable Instances

void main() {
  //immutable instances

  final employee1 =
      new Employee(id: 1, name: "John Doe", position: "CTO", companyname: "A");

  // print(employee1.toString());

//    employee1.id =2 ;

//    employee1.name = "Jane Doe";

  print(employee1.toString());
}

class Employee {
  final int id;

  final String name;

  final String position;

  final String companyname;

  @override
  String toString() {
    return "id: $id , name: $name ,  position : $position , companyname: $companyname";
  }

  Employee({this.id, this.name, this.position, this.companyname});
}