whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String $type,
    2. String text,
    3. List<RichtextFacet>? facets,
    4. ReplyRef? reply,
    5. UFeedPostEmbed? embed,
    6. List<String>? langs,
    7. UFeedPostLabels? labels,
    8. List<String>? tags,
    9. DateTime createdAt,
    10. 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,  String text, @RichtextFacetConverter()  List<RichtextFacet>? facets, @ReplyRefConverter()  ReplyRef? reply, @UFeedPostEmbedConverter()  UFeedPostEmbed? embed,  List<String>? langs, @UFeedPostLabelsConverter()  UFeedPostLabels? labels,  List<String>? tags,  DateTime createdAt,  Map<String, dynamic>? $unknown)?  $default,) {final _that = this;
switch (_that) {
case _FeedPostRecord() when $default != null:
return $default(_that.$type,_that.text,_that.facets,_that.reply,_that.embed,_that.langs,_that.labels,_that.tags,_that.createdAt,_that.$unknown);case _:
  return null;

}
}