mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? repoRef(
    1. USubjectStatusViewSubjectRepoRef value
    )?,
  2. TResult? repoStrongRef(
    1. USubjectStatusViewSubjectRepoStrongRef value
    )?,
  3. TResult? messageRef(
    1. USubjectStatusViewSubjectMessageRef value
    )?,
  4. TResult? unknown(
    1. USubjectStatusViewSubjectUnknown 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( USubjectStatusViewSubjectRepoRef value)?  repoRef,TResult? Function( USubjectStatusViewSubjectRepoStrongRef value)?  repoStrongRef,TResult? Function( USubjectStatusViewSubjectMessageRef value)?  messageRef,TResult? Function( USubjectStatusViewSubjectUnknown value)?  unknown,}){
final _that = this;
switch (_that) {
case USubjectStatusViewSubjectRepoRef() when repoRef != null:
return repoRef(_that);case USubjectStatusViewSubjectRepoStrongRef() when repoStrongRef != null:
return repoStrongRef(_that);case USubjectStatusViewSubjectMessageRef() when messageRef != null:
return messageRef(_that);case USubjectStatusViewSubjectUnknown() when unknown != null:
return unknown(_that);case _:
  return null;

}
}