whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String id,
    2. String userId,
    3. String topicId,
    4. String mastery,
    5. int chunksRead,
    6. int totalChunks,
    7. double? quizScoreAvg,
    8. DateTime? lastStudiedAt,
    9. DateTime? createdAt,
    10. DateTime? updatedAt,
    )?
)

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 userId,  String topicId,  String mastery,  int chunksRead,  int totalChunks,  double? quizScoreAvg,  DateTime? lastStudiedAt,  DateTime? createdAt,  DateTime? updatedAt)?  $default,) {final _that = this;
switch (_that) {
case _UserTopicProgressModel() when $default != null:
return $default(_that.id,_that.userId,_that.topicId,_that.mastery,_that.chunksRead,_that.totalChunks,_that.quizScoreAvg,_that.lastStudiedAt,_that.createdAt,_that.updatedAt);case _:
  return null;

}
}