From 1d7a95df565192fc02a18b0b297b39dd615eaeb5 Mon Sep 17 00:00:00 2001
From: Daniel Luz
Date: Sun, 4 Nov 2012 19:11:24 -0200
Subject: feat(scope): only evaluate constant $watch expressions once

---
 src/ng/rootScope.js | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src')

diff --git a/src/ng/rootScope.js b/src/ng/rootScope.js
index b6a582bc..866b957e 100644
--- a/src/ng/rootScope.js
+++ b/src/ng/rootScope.js
@@ -300,6 +300,14 @@ function $RootScopeProvider(){
           watcher.fn = function(newVal, oldVal, scope) {listenFn(scope);};
         }
 
+        if (typeof watchExp == 'string' && get.constant) {
+          var originalFn = watcher.fn;
+          watcher.fn = function(newVal, oldVal, scope) {
+            originalFn.call(this, newVal, oldVal, scope);
+            arrayRemove(array, watcher);
+          };
+        }
+
         if (!array) {
           array = scope.$$watchers = [];
         }
-- 
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