whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. VoNotificationPermissionStatus permissionStatus,
    2. String? fcmToken,
    3. bool isRegistering,
    4. String? error,
    )?
)

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( VoNotificationPermissionStatus permissionStatus,  String? fcmToken,  bool isRegistering,  String? error)?  $default,) {final _that = this;
switch (_that) {
case _VoNotificationState() when $default != null:
return $default(_that.permissionStatus,_that.fcmToken,_that.isRegistering,_that.error);case _:
  return null;

}
}