when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<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 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( 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():
return $default(_that.id,_that.userId,_that.topicId,_that.mastery,_that.chunksRead,_that.totalChunks,_that.quizScoreAvg,_that.lastStudiedAt,_that.createdAt,_that.updatedAt);case _:
  throw StateError('Unexpected subclass');

}
}