From cb29632a5802e930262919b3db64ca4806c5cfc7 Mon Sep 17 00:00:00 2001
From: Karl Seamon
Date: Tue, 17 Dec 2013 14:22:04 -0500
Subject: perf: use faster check for $$ prefix

Use two calls to charAt instead of substr to detect a $$prefix in the shallowCopy functions.
This makes shallowCopy 25-50% faster (depending on which browser is used).
http://jsperf.com/angular-shallow-copy

Closes #5457
---
 src/ngResource/resource.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/ngResource')

diff --git a/src/ngResource/resource.js b/src/ngResource/resource.js
index 281dd4ac..a007c7b1 100644
--- a/src/ngResource/resource.js
+++ b/src/ngResource/resource.js
@@ -35,7 +35,7 @@ function shallowClearAndCopy(src, dst) {
   });
 
   for (var key in src) {
-    if (src.hasOwnProperty(key) && key.substr(0, 2) !== '$$') {
+    if (src.hasOwnProperty(key) && key.charAt(0) !== '$' && key.charAt(1) !== '$') {
       dst[key] = src[key];
     }
   }
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