when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(List<Sub2ApiAdminUserBreakdownItem> users, DateTime startDate, DateTime endDate))

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(
    List<Sub2ApiAdminUserBreakdownItem> users,
    DateTime startDate,
    DateTime endDate,
  )
  $default,
) {
  final _that = this;
  switch (_that) {
    case _Sub2ApiAdminUserBreakdown():
      return $default(_that.users, _that.startDate, _that.endDate);
    case _:
      throw StateError('Unexpected subclass');
  }
}