when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. List<String> fileIds,
    2. ChunkingStrategyRequestParam? chunkingStrategy
    )
)

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(
          @JsonKey(name: 'file_ids') List<String> fileIds,
          @JsonKey(name: 'chunking_strategy', includeIfNull: false)
          ChunkingStrategyRequestParam? chunkingStrategy)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _CreateVectorStoreFileBatchRequest():
      return $default(_that.fileIds, _that.chunkingStrategy);
    case _:
      throw StateError('Unexpected subclass');
  }
}