whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String id,
    2. String? chunkId,
    3. String topicId,
    4. String questionType,
    5. String questionText,
    6. String? expectedAnswer,
    7. String position,
    8. int sortOrder,
    )?
)

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? chunkId,  String topicId,  String questionType,  String questionText,  String? expectedAnswer,  String position,  int sortOrder)?  $default,) {final _that = this;
switch (_that) {
case _ReadingQuestion() when $default != null:
return $default(_that.id,_that.chunkId,_that.topicId,_that.questionType,_that.questionText,_that.expectedAnswer,_that.position,_that.sortOrder);case _:
  return null;

}
}