whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String id,
    2. String topicId,
    3. String? bookId,
    4. int chunkIndex,
    5. String content,
    6. int? pageNumber,
    7. int? tokenCount,
    8. Map<String, dynamic> metadata,
    )?
)

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( String id,  String topicId,  String? bookId,  int chunkIndex,  String content,  int? pageNumber,  int? tokenCount,  Map<String, dynamic> metadata)?  $default,) {final _that = this;
switch (_that) {
case _ContentChunk() when $default != null:
return $default(_that.id,_that.topicId,_that.bookId,_that.chunkIndex,_that.content,_that.pageNumber,_that.tokenCount,_that.metadata);case _:
  return null;

}
}