whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(RestfulRequest type, String url, Map<String, String> headers, Map<String, dynamic>? body,)?)

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( RestfulRequest type,  String url,  Map<String, String> headers,  Map<String, dynamic>? body)?  $default,) {final _that = this;
switch (_that) {
case _FhirHttpRequest() when $default != null:
return $default(_that.type,_that.url,_that.headers,_that.body);case _:
  return null;

}
}