whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String? email,
    2. int? level,
    3. String id,
    4. String? flow,
    5. String? seed,
    6. String? encryption,
    7. VLessReverseConfig? reverse,
    8. int? testpre,
    9. List<int>? testseed,
    )?
)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  TResult? Function(
          String? email,
          int? level,
          String id,
          String? flow,
          String? seed,
          String? encryption,
          VLessReverseConfig? reverse,
          int? testpre,
          List<int>? testseed)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _VLessUser() when $default != null:
      return $default(
          _that.email,
          _that.level,
          _that.id,
          _that.flow,
          _that.seed,
          _that.encryption,
          _that.reverse,
          _that.testpre,
          _that.testseed);
    case _:
      return null;
  }
}