mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? reportRef(
    1. UNotificationTargetReportRef value
    )?,
  2. TResult? subjectRef(
    1. UNotificationTargetSubjectRef value
    )?,
  3. TResult? standingRef(
    1. UNotificationTargetStandingRef value
    )?,
  4. TResult? unknown(
    1. UNotificationTargetUnknown value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

switch (sealedClass) {
  case final Subclass value:
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( UNotificationTargetReportRef value)?  reportRef,TResult? Function( UNotificationTargetSubjectRef value)?  subjectRef,TResult? Function( UNotificationTargetStandingRef value)?  standingRef,TResult? Function( UNotificationTargetUnknown value)?  unknown,}){
final _that = this;
switch (_that) {
case UNotificationTargetReportRef() when reportRef != null:
return reportRef(_that);case UNotificationTargetSubjectRef() when subjectRef != null:
return subjectRef(_that);case UNotificationTargetStandingRef() when standingRef != null:
return standingRef(_that);case UNotificationTargetUnknown() when unknown != null:
return unknown(_that);case _:
  return null;

}
}