gistfile1.txt

void main() {
  var test = Test(something: [5]);
  test.something[0] = 6;
  print(test.something); //prints 6
  var test2 = Test(something: const [5]);
  //   test2.something[0] = 6; //this will give you an error
  print(test2.something); //prints 6
}

class Test {
  List<int> something;
  Test({required this.something});
}