when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. bool status,
    2. String? message,
    3. List<IsibookReservationExtra> extras
    )
)

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(
          bool status, String? message, List<IsibookReservationExtra> extras)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _IsibookExtrasResponse():
      return $default(_that.status, _that.message, _that.extras);
  }
}