cluster: clarify construct Handle

Improve the readability for costruct SharedHandle and
RoundRobinHandle

PR-URL: #37385
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/cluster/master.js

@@ -114,8 +114,7 @@ function createWorkerProcess(id, env) {
   const workerEnv = { ...process.env, ...env, NODE_UNIQUE_ID: `${id}` };
   const execArgv = [...cluster.settings.execArgv];
   const debugArgRegex = /--inspect(?:-brk|-port)?|--debug-port/;
-  const nodeOptions = process.env.NODE_OPTIONS ?
-    process.env.NODE_OPTIONS : '';
+  const nodeOptions = process.env.NODE_OPTIONS || '';
 
   if (ArrayPrototypeSome(execArgv,
                          (arg) => RegExpPrototypeTest(debugArgRegex, arg)) ||
@@ -299,17 +298,17 @@ function queryServer(worker, message) {
         address = message.address;
     }
 
-    let constructor = RoundRobinHandle;
     // UDP is exempt from round-robin connection balancing for what should
     // be obvious reasons: it's connectionless. There is nothing to send to
     // the workers except raw datagrams and that's pointless.
     if (schedulingPolicy !== SCHED_RR ||
         message.addressType === 'udp4' ||
         message.addressType === 'udp6') {
-      constructor = SharedHandle;
+      handle = new SharedHandle(key, address, message);
+    } else {
+      handle = new RoundRobinHandle(key, address, message);
     }
 
-    handle = new constructor(key, address, message);
     handles.set(key, handle);
   }