when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(int id, int userId, int attributeId, String value, DateTime createdAt, DateTime updatedAt,))

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs
TResult when<TResult extends Object?>(
  TResult Function(
    int id,
    int userId,
    int attributeId,
    String value,
    DateTime createdAt,
    DateTime updatedAt,
  )
  $default,
) {
  final _that = this;
  switch (_that) {
    case _Sub2ApiAdminUserAttributeValue():
      return $default(
        _that.id,
        _that.userId,
        _that.attributeId,
        _that.value,
        _that.createdAt,
        _that.updatedAt,
      );
    case _:
      throw StateError('Unexpected subclass');
  }
}