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? chunkId,
    5. String cardType,
    6. String front,
    7. String back,
    8. double easinessFactor,
    9. int intervalDays,
    10. int repetitions,
    11. DateTime nextReviewAt,
    12. DateTime? lastReviewAt,
    13. int? lastQuality,
    14. double? stability,
    15. double? difficulty,
    16. String state,
    17. double? lastElapsedDays,
    18. int? scheduledDays,
    19. String algorithm,
    20. Map<String, dynamic>? cardData,
    )?
)

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? chunkId,  String cardType,  String front,  String back,  double easinessFactor,  int intervalDays,  int repetitions,  DateTime nextReviewAt,  DateTime? lastReviewAt,  int? lastQuality,  double? stability,  double? difficulty,  String state,  double? lastElapsedDays,  int? scheduledDays,  String algorithm,  Map<String, dynamic>? cardData)?  $default,) {final _that = this;
switch (_that) {
case _ReviewCardModel() when $default != null:
return $default(_that.id,_that.userId,_that.topicId,_that.chunkId,_that.cardType,_that.front,_that.back,_that.easinessFactor,_that.intervalDays,_that.repetitions,_that.nextReviewAt,_that.lastReviewAt,_that.lastQuality,_that.stability,_that.difficulty,_that.state,_that.lastElapsedDays,_that.scheduledDays,_that.algorithm,_that.cardData);case _:
  return null;

}
}