when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<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 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? chunkId,  String topicId,  String questionType,  String questionText,  String? expectedAnswer,  String position,  int sortOrder)  $default,) {final _that = this;
switch (_that) {
case _ReadingQuestion():
return $default(_that.id,_that.chunkId,_that.topicId,_that.questionType,_that.questionText,_that.expectedAnswer,_that.position,_that.sortOrder);case _:
  throw StateError('Unexpected subclass');

}
}