maybeWhen<TResult extends Object?> method

@optionalTypeArgs TResult maybeWhen<TResult extends Object?>({ TResult user(String id, String chatId, String userId, DateTime timestamp, String text,)?, TResult assistant(String id, String chatId, String userId, DateTime timestamp, String? modelId, String text,)?, TResult context(String id, String chatId, String userId, DateTime timestamp, String text,)?, TResult historySummary(String id, String chatId, String userId, DateTime timestampFrom, DateTime timestamp, String? modelId, String text,)?, required TResult orElse(), })

A variant of when that fallback to an orElse callback.

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return orElse();
}

Implementation

@optionalTypeArgs TResult maybeWhen<TResult extends Object?>({TResult Function( String id,  String chatId,  String userId,  DateTime timestamp,  String text)?  user,TResult Function( String id,  String chatId,  String userId,  DateTime timestamp,  String? modelId,  String text)?  assistant,TResult Function( String id,  String chatId,  String userId,  DateTime timestamp,  String text)?  context,TResult Function( String id,  String chatId,  String userId,  DateTime timestampFrom,  DateTime timestamp,  String? modelId,  String text)?  historySummary,required TResult orElse(),}) {final _that = this;
switch (_that) {
case UserItem() when user != null:
return user(_that.id,_that.chatId,_that.userId,_that.timestamp,_that.text);case AssistantItem() when assistant != null:
return assistant(_that.id,_that.chatId,_that.userId,_that.timestamp,_that.modelId,_that.text);case ContextItem() when context != null:
return context(_that.id,_that.chatId,_that.userId,_that.timestamp,_that.text);case HistorySummaryItem() when historySummary != null:
return historySummary(_that.id,_that.chatId,_that.userId,_that.timestampFrom,_that.timestamp,_that.modelId,_that.text);case _:
  return orElse();

}
}