lib: use arrow functions instead of bind

use `arrow functions` instead of `bind(this)` in order to improve
performance through optimizations.

PR-URL: https://github.com/nodejs/node/pull/3622
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/lib/cluster.js b/lib/cluster.js
index f202f25cdd..6ab829de45 100644
--- a/lib/cluster.js
+++ b/lib/cluster.js
@@ -33,8 +33,12 @@ function Worker(options) {
 
   if (options.process) {
     this.process = options.process;
-    this.process.on('error', this.emit.bind(this, 'error'));
-    this.process.on('message', this.emit.bind(this, 'message'));
+    this.process.on('error', (code, signal) =>
+      this.emit('error', code, signal)
+    );
+    this.process.on('message', (message, handle) =>
+      this.emit('message', message, handle)
+    );
   }
 }
 util.inherits(Worker, EventEmitter);
@@ -337,7 +341,9 @@ function masterInit() {
       process: workerProcess
     });
 
-    worker.on('message', this.emit.bind(this, 'message'));
+    worker.on('message', (message, handle) =>
+      this.emit('message', message, handle)
+    );
 
     worker.process.once('exit', function(exitCode, signalCode) {
       /*