benchmark: replace [].join() with ''.repeat()

Also add a benchmark to compare both ways to create strings.

PR-URL: https://github.com/nodejs/node/pull/12170
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/benchmark/net/net-c2s-cork.js b/benchmark/net/net-c2s-cork.js
index 6af9162025..4a119e9c27 100644
--- a/benchmark/net/net-c2s-cork.js
+++ b/benchmark/net/net-c2s-cork.js
@@ -27,11 +27,11 @@ function main(conf) {
       break;
     case 'utf':
       encoding = 'utf8';
-      chunk = new Array(len / 2 + 1).join('ü');
+      chunk = 'ü'.repeat(len / 2);
       break;
     case 'asc':
       encoding = 'ascii';
-      chunk = new Array(len + 1).join('x');
+      chunk = 'x'.repeat(len);
       break;
     default:
       throw new Error('invalid type: ' + type);