mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? accountHosting(
    1. USubjectStatusViewHostingAccountHosting value
    )?,
  2. TResult? recordHosting(
    1. USubjectStatusViewHostingRecordHosting value
    )?,
  3. TResult? unknown(
    1. USubjectStatusViewHostingUnknown 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( USubjectStatusViewHostingAccountHosting value)?  accountHosting,TResult? Function( USubjectStatusViewHostingRecordHosting value)?  recordHosting,TResult? Function( USubjectStatusViewHostingUnknown value)?  unknown,}){
final _that = this;
switch (_that) {
case USubjectStatusViewHostingAccountHosting() when accountHosting != null:
return accountHosting(_that);case USubjectStatusViewHostingRecordHosting() when recordHosting != null:
return recordHosting(_that);case USubjectStatusViewHostingUnknown() when unknown != null:
return unknown(_that);case _:
  return null;

}
}