when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String chatId,
    2. String id,
    3. ChatEventRole role,
    4. int timestamp,
    5. ChatEventType type,
    6. String? emotionFeatures,
    7. String? messageText,
    8. String? metadata,
    9. String? relatedEventId,
    )
)

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 chatId,  String id,  ChatEventRole role,  int timestamp,  ChatEventType type,  String? emotionFeatures,  String? messageText,  String? metadata,  String? relatedEventId)  $default,) {final _that = this;
switch (_that) {
case _ChatEvent():
return $default(_that.chatId,_that.id,_that.role,_that.timestamp,_that.type,_that.emotionFeatures,_that.messageText,_that.metadata,_that.relatedEventId);case _:
  throw StateError('Unexpected subclass');

}
}