benchmark: use destructuring

This applies to all `async_hooks`, `dns`, `cluster`, `domain` and
`module` benchmarks.

PR-URL: nodejs#18250
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

benchmark/async_hooks/gc-tracking.js

@@ -21,10 +21,8 @@ function endAfterGC(n) {
   });
 }
 
-function main(conf) {
-  const n = +conf.n;
-
-  switch (conf.method) {
+function main({ n, method }) {
+  switch (method) {
     case 'trackingEnabled':
       bench.start();
       for (let i = 0; i < n; i++) {

benchmark/cluster/echo.js

@@ -10,22 +10,19 @@ if (cluster.isMaster) {
     n: [1e5]
   });
 
-  function main(conf) {
-    const n = +conf.n;
-    const workers = +conf.workers;
-    const sends = +conf.sendsPerBroadcast;
-    const expectedPerBroadcast = sends * workers;
-    var payload;
+  function main({ n, workers, sendsPerBroadcast, payload }) {
+    const expectedPerBroadcast = sendsPerBroadcast * workers;
     var readies = 0;
     var broadcasts = 0;
     var msgCount = 0;
+    var data;
 
-    switch (conf.payload) {
+    switch (payload) {
       case 'string':
-        payload = 'hello world!';
+        data = 'hello world!';
         break;
       case 'object':
-        payload = { action: 'pewpewpew', powerLevel: 9001 };
+        data = { action: 'pewpewpew', powerLevel: 9001 };
         break;
       default:
         throw new Error('Unsupported payload type');
@@ -51,8 +48,8 @@ if (cluster.isMaster) {
       }
       for (id in cluster.workers) {
         const worker = cluster.workers[id];
-        for (var i = 0; i < sends; ++i)
-          worker.send(payload);
+        for (var i = 0; i < sendsPerBroadcast; ++i)
+          worker.send(data);
       }
     }
 

benchmark/dns/lookup.js

@@ -9,13 +9,10 @@ const bench = common.createBenchmark(main, {
   n: [5e6]
 });
 
-function main(conf) {
-  const name = conf.name;
-  const n = +conf.n;
-  const all = conf.all === 'true' ? true : false;
+function main({ name, n, all }) {
   var i = 0;
 
-  if (all) {
+  if (all === 'true') {
     const opts = { all: true };
     bench.start();
     (function cb() {

benchmark/domain/domain-fn-args.js

@@ -3,17 +3,15 @@ const common = require('../common.js');
 const domain = require('domain');
 
 const bench = common.createBenchmark(main, {
-  arguments: [0, 1, 2, 3],
+  args: [0, 1, 2, 3],
   n: [10]
 });
 
 const bdomain = domain.create();
 const gargs = [1, 2, 3];
 
-function main(conf) {
-
-  const n = +conf.n;
-  const myArguments = gargs.slice(0, conf.arguments);
+function main({ n, args }) {
+  const myArguments = gargs.slice(0, args);
   bench.start();
 
   bdomain.enter();

benchmark/module/module-loader.js

@@ -12,8 +12,8 @@ const bench = common.createBenchmark(main, {
   useCache: ['true', 'false']
 });
 
-function main(conf) {
-  const n = +conf.thousands * 1e3;
+function main({ thousands, fullPath, useCache }) {
+  const n = thousands * 1e3;
 
   refreshTmpDir();
   try { fs.mkdirSync(benchmarkDirectory); } catch (e) {}
@@ -30,10 +30,10 @@ function main(conf) {
     );
   }
 
-  if (conf.fullPath === 'true')
-    measureFull(n, conf.useCache === 'true');
+  if (fullPath === 'true')
+    measureFull(n, useCache === 'true');
   else
-    measureDir(n, conf.useCache === 'true');
+    measureDir(n, useCache === 'true');
 
   refreshTmpDir();
 }