whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String $type, String did, @AtUriConverter.new() AtUri? following, @AtUriConverter.new() AtUri? followedBy, @AtUriConverter.new() AtUri? blocking, @AtUriConverter.new() AtUri? blockedBy, @AtUriConverter.new() AtUri? blockingByList, @AtUriConverter.new() AtUri? blockedByList, 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 did, @AtUriConverter()  AtUri? following, @AtUriConverter()  AtUri? followedBy, @AtUriConverter()  AtUri? blocking, @AtUriConverter()  AtUri? blockedBy, @AtUriConverter()  AtUri? blockingByList, @AtUriConverter()  AtUri? blockedByList,  Map<String, dynamic>? $unknown)?  $default,) {final _that = this;
switch (_that) {
case _Relationship() when $default != null:
return $default(_that.$type,_that.did,_that.following,_that.followedBy,_that.blocking,_that.blockedBy,_that.blockingByList,_that.blockedByList,_that.$unknown);case _:
  return null;

}
}