ShamilPP

void main() {
  List<int> months = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
  int userValue = 6; // Change value
  months.sort((a, b) {
    if (userValue <= a) {
      return a.compareTo(b);
    } else if (userValue <= b) {
      return b.compareTo(a);
    } else {
      return a.compareTo(b);

ShamilPP

void main() {
  List<int> months = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
  int userValue = 6; // Change value
  months.sort((a, b) {
    if (userValue <= a && userValue <= b) {
      return a.compareTo(b);
    } else {
      return b.compareTo(a);
    }
  });