whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String $type,
    2. PostView post,
    3. bool moreParents,
    4. int moreReplies,
    5. bool opThread,
    6. bool hiddenByThreadgate,
    7. bool mutedByViewer,
    8. 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, @PostViewConverter()  PostView post,  bool moreParents,  int moreReplies,  bool opThread,  bool hiddenByThreadgate,  bool mutedByViewer,  Map<String, dynamic>? $unknown)?  $default,) {final _that = this;
switch (_that) {
case _ThreadItemPost() when $default != null:
return $default(_that.$type,_that.post,_that.moreParents,_that.moreReplies,_that.opThread,_that.hiddenByThreadgate,_that.mutedByViewer,_that.$unknown);case _:
  return null;

}
}