From 60245a57d85541cd75f4c27c01cc9ffa63e15750 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Mon, 4 Nov 2013 18:18:31 +0100
Subject: [PATCH] Make ol.Object#getKeys about 10x faster

---
 src/ol/object.js | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/ol/object.js b/src/ol/object.js
index 4c9338a932..5f8bdb0968 100644
--- a/src/ol/object.js
+++ b/src/ol/object.js
@@ -191,10 +191,29 @@ ol.Object.prototype.get = function(key) {
  * @return {Array.<string>} List of property names.
  */
 ol.Object.prototype.getKeys = function() {
-  var keys = goog.object.getKeys(ol.Object.getAccessors(this)).concat(
-      goog.object.getKeys(this.values_));
-  goog.array.removeDuplicates(keys);
-  return keys;
+  var accessors = ol.Object.getAccessors(this);
+  var keysObject;
+  if (goog.object.isEmpty(this.values_)) {
+    if (goog.object.isEmpty(accessors)) {
+      return [];
+    } else {
+      keysObject = accessors;
+    }
+  } else {
+    if (goog.object.isEmpty(accessors)) {
+      keysObject = this.values_;
+    } else {
+      keysObject = {};
+      var key;
+      for (key in this.values_) {
+        keysObject[key] = true;
+      }
+      for (key in accessors) {
+        keysObject[key] = true;
+      }
+    }
+  }
+  return goog.object.getKeys(keysObject);
 };