lib: prefer optional chaining

PR-URL: https://github.com/nodejs/node/pull/55045
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>

test/common/dns.js

@@ -196,11 +196,11 @@ function writeDNSPacket(parsed) {
 
   buffers.push(new Uint16Array([
     parsed.id,
-    parsed.flags === undefined ? kStandardResponseFlags : parsed.flags,
-    parsed.questions && parsed.questions.length,
-    parsed.answers && parsed.answers.length,
-    parsed.authorityAnswers && parsed.authorityAnswers.length,
-    parsed.additionalRecords && parsed.additionalRecords.length,
+    parsed.flags ?? kStandardResponseFlags,
+    parsed.questions?.length,
+    parsed.answers?.length,
+    parsed.authorityAnswers?.length,
+    parsed.additionalRecords?.length,
   ]));
 
   for (const q of parsed.questions) {