null checks

readme.md

null checks

Created with <3 with dartpad.dev.

main.dart

extension on int? {
  p() => print('int, ${this.runtimeType}');
}
extension on Null {
  p() => print('null');
}
const _defaultNull = null;
// class Ii implements int {}


test({int? a = _defaultNull, int? b = _defaultNull}) {
  final bool withA = a != _defaultNull;
  final bool withB = b != _defaultNull;
//   final bool withA = a is Null;
//   final bool withB = b is Null;
  print('a provided: $withA');
  print('b provided: $withB');
//   _defaultNull.p();
//   if (a == null) (a as Null).p();
  a.p();
  b.p();
//   if (b == null) (b as Null).p();
}


// copyWith({int? value}) --> copyWith({V<int?>? value} = const V<int?>()) (edited)
// white_check_mark
// +1
// heavy_check_mark





// 10:02
// copyWith();.
// copyWith(value: V(10));
// copyWith(value: V(null)); (edited)
// 10:04
// copy((b) => b.value = 10); (edited)