benchmark: refactor to use template string

PR-URL: #17313
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: toniov

benchmark/zlib/creation.js

@@ -12,7 +12,7 @@ const bench = common.createBenchmark(main, {
 
 function main(conf) {
   const n = +conf.n;
-  const fn = zlib['create' + conf.type];
+  const fn = zlib[`create${conf.type}`];
   if (typeof fn !== 'function')
     throw new Error('Invalid zlib type');
   var i = 0;