From aab1dd6ff4a30191f36d6a7ed3fd7e47477dd2fb Mon Sep 17 00:00:00 2001
From: Brian White <mscdex@mscdex.net>
Date: Mon, 2 Jan 2017 03:17:21 -0500
Subject: [PATCH] events: improve removeListener() performance

array.shift() seems to be faster than arrayClone() when the item
to remove is at the front (at least with V8 5.4).

PR-URL: https://github.com/nodejs/node/pull/10572
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
---
 lib/events.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/events.js b/lib/events.js
index 6a8345ab7bc516..209700e65ad596 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -360,6 +360,8 @@ EventEmitter.prototype.removeListener =
           } else {
             delete events[type];
           }
+        } else if (position === 0) {
+          list.shift();
         } else {
           spliceOne(list, position);
         }