Null Aware Operators

main.dart

void main() {
  String bonusItem1;

  if (bonusItem1 == null) {
    print('Your 1st bonus is a Powerbank');
  } else {
    print('Your 1st bonus is a $bonusItem1');
  }

  String bonusItem2;
  print('Your 2nd bonus is ${bonusItem2 ?? 'LCD Screen'} ');

  String bonusItem3;
  bonusItem3 ??= 'External Drive';

  print('Your 3rd bonus is $bonusItem3');
}