whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String id, @JsonKey.new(defaultValue: '') String address1, @JsonKey.new(defaultValue: '') String city, @JsonKey.new(defaultValue: '') String country, String? zip, String? lastName, String? name, String? firstName, String? address2, String? company, String? countryCodeV2, String? formattedArea, double? latitude, double? longitude, String? phone, String? province, String? provinceCode,)?)

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 id, @JsonKey(defaultValue: '')  String address1, @JsonKey(defaultValue: '')  String city, @JsonKey(defaultValue: '')  String country,  String? zip,  String? lastName,  String? name,  String? firstName,  String? address2,  String? company,  String? countryCodeV2,  String? formattedArea,  double? latitude,  double? longitude,  String? phone,  String? province,  String? provinceCode)?  $default,) {final _that = this;
switch (_that) {
case _MailingAddress() when $default != null:
return $default(_that.id,_that.address1,_that.city,_that.country,_that.zip,_that.lastName,_that.name,_that.firstName,_that.address2,_that.company,_that.countryCodeV2,_that.formattedArea,_that.latitude,_that.longitude,_that.phone,_that.province,_that.provinceCode);case _:
  return null;

}
}