From cb29632a5802e930262919b3db64ca4806c5cfc7 Mon Sep 17 00:00:00 2001
From: Karl Seamon <bannanafiend@gmail.com>
Date: Tue, 17 Dec 2013 14:22:04 -0500
Subject: [PATCH] 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/Angular.js             | 2 +-
 src/ngResource/resource.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Angular.js b/src/Angular.js
index e32c3739bbb7..88ea452b3749 100644
--- a/src/Angular.js
+++ b/src/Angular.js
@@ -769,7 +769,7 @@ function shallowCopy(src, dst) {
   for(var key in src) {
     // shallowCopy is only ever called by $compile nodeLinkFn, which has control over src
     // so we don't need to worry about using our custom hasOwnProperty here
-    if (src.hasOwnProperty(key) && key.substr(0, 2) !== '$$') {
+    if (src.hasOwnProperty(key) && key.charAt(0) !== '$' && key.charAt(1) !== '$') {
       dst[key] = src[key];
     }
   }
diff --git a/src/ngResource/resource.js b/src/ngResource/resource.js
index 281dd4ac24be..a007c7b16d4e 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];
     }
   }