whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String? packets,
    2. XrayInt32Range? length,
    3. XrayInt32Range? delay,
    4. XrayInt32Range? maxSplit,
    )?
)

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? packets, XrayInt32Range? length,
          XrayInt32Range? delay, XrayInt32Range? maxSplit)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _FragmentMask() when $default != null:
      return $default(
          _that.packets, _that.length, _that.delay, _that.maxSplit);
    case _:
      return null;
  }
}