whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String errorMessage,
    2. String? i18nKey,
    3. FailureCategory category,
    4. String? code,
    5. String? operation,
    6. List<Map<String, dynamic>>? locations,
    7. List? path,
    8. Map<String, dynamic>? extensions,
    9. int? status,
    10. String? requestId,
    11. String? traceId,
    12. String? service,
    13. Map<String, List<String>>? validation,
    14. bool retryable,
    15. DateTime? retryAfter,
    16. String? url,
    17. String? method,
    18. Map<String, String>? headers,
    19. bool? tokenExpired,
    20. bool? canRefresh,
    21. String? debugMessage,
    22. String? stackTrace,
    )?
)

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 errorMessage,  String? i18nKey,  FailureCategory category,  String? code,  String? operation,  List<Map<String, dynamic>>? locations,  List<dynamic>? path,  Map<String, dynamic>? extensions,  int? status,  String? requestId,  String? traceId,  String? service,  Map<String, List<String>>? validation,  bool retryable,  DateTime? retryAfter,  String? url,  String? method,  Map<String, String>? headers,  bool? tokenExpired,  bool? canRefresh,  String? debugMessage,  String? stackTrace)?  $default,) {final _that = this;
switch (_that) {
case _Failure() when $default != null:
return $default(_that.errorMessage,_that.i18nKey,_that.category,_that.code,_that.operation,_that.locations,_that.path,_that.extensions,_that.status,_that.requestId,_that.traceId,_that.service,_that.validation,_that.retryable,_that.retryAfter,_that.url,_that.method,_that.headers,_that.tokenExpired,_that.canRefresh,_that.debugMessage,_that.stackTrace);case _:
  return null;

}
}