Invert the for loop

backbone.js

@@ -241,18 +241,14 @@
   };
 
   Events.listenToOnce = function(obj, name, callback) {
-    this.listenTo(obj, name, callback);
-
-    var onces = name;
-    if (typeof onces !== 'object') {
-      onces = {};
-      onces[name] = callback;
-    }
-    for (var event in onces) {
-      callback = _.partial(this.stopListening, obj, event, onces[event]);
-      callback._callback = onces[event];
-      this.listenTo(obj, event, callback);
+    if (typeof name === 'object') {
+      for (var event in name) this.listenToOnce(obj, event, name[event]);
+      return this;
     }
+    var once = _.partial(this.stopListening, obj, name, callback);
+    once._callback = callback;
+    this.listenTo(obj, name, callback);
+    this.listenTo(obj, name, once);
     return this;
   };