whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String? url, String? title, String? description, String? image, String? error, @JsonKey.new(name: 'likely_type') String? likelyType,)?)

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? url,  String? title,  String? description,  String? image,  String? error, @JsonKey(name: 'likely_type')  String? likelyType)?  $default,) {final _that = this;
switch (_that) {
case _LinkPreview() when $default != null:
return $default(_that.url,_that.title,_that.description,_that.image,_that.error,_that.likelyType);case _:
  return null;

}
}