whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. XrayAddress? address,
    2. int? port,
    3. int? level,
    4. String? email,
    5. String? password,
    6. String? flow,
    7. List<TrojanServerTarget>? servers,
    )?
)

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(
          XrayAddress? address,
          int? port,
          int? level,
          String? email,
          String? password,
          String? flow,
          List<TrojanServerTarget>? servers)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _TrojanClientConfig() when $default != null:
      return $default(_that.address, _that.port, _that.level, _that.email,
          _that.password, _that.flow, _that.servers);
    case _:
      return null;
  }
}