whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String $type, MessageView message, ReactionView reaction, Map<String, dynamic>? $unknown,)?)

A variant of when that fallback to returning null

It is equivalent to doing:

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

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( String $type, @MessageViewConverter()  MessageView message, @ReactionViewConverter()  ReactionView reaction,  Map<String, dynamic>? $unknown)?  $default,) {final _that = this;
switch (_that) {
case _MessageAndReactionView() when $default != null:
return $default(_that.$type,_that.message,_that.reaction,_that.$unknown);case _:
  return null;

}
}