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 previousMastery,
    5. String grantedMastery,
    6. String grantedBy,
    7. String? reason,
    8. DateTime createdAt,
    )
)

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 previousMastery,  String grantedMastery,  String grantedBy,  String? reason,  DateTime createdAt)  $default,) {final _that = this;
switch (_that) {
case _MasteryOverride():
return $default(_that.id,_that.userId,_that.topicId,_that.previousMastery,_that.grantedMastery,_that.grantedBy,_that.reason,_that.createdAt);case _:
  throw StateError('Unexpected subclass');

}
}