whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(@JsonKey.new(name: 'system') String? system, String? network, String? level, String? opt, String? value, String? type,)?)

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(@JsonKey(name: 'system') String? system, String? network,
          String? level, String? opt, String? value, String? type)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _CustomSockoptConfig() when $default != null:
      return $default(_that.system, _that.network, _that.level, _that.opt,
          _that.value, _that.type);
    case _:
      return null;
  }
}