fix(orderBy): make object-to-primtiive behaviour work for objects with null prototype

src/ng/filter/orderBy.js

@@ -170,18 +170,18 @@ function orderByFilter($parse) {
       if (t1 === t2 && t1 === "object") {
         // If types are both numbers, emulate abstract ToPrimitive() operation
         // in order to get primitive values suitable for comparison
-        t1 = typeof (v1 = v1.valueOf());
-        t2 = typeof (v2 = v2.valueOf());
+        t1 = typeof (v1.valueOf ? v1 = v1.valueOf() : v1);
+        t2 = typeof (v2.valueOf ? v2 = v2.valueOf() : v2);
         if (t1 === t2 && t1 === "object") {
           // Object.prototype.valueOf will return the original object, by
           // default. If we do not receive a primitive value, use ToString()
           // instead.
-          t1 = typeof (v1 = v1.toString());
-          t2 = typeof (v2 = v2.toString());
+          t1 = typeof (v1.toString ? v1 = v1.toString() : v1);
+          t2 = typeof (v2.toString ? v2 = v2.toString() : v2);
 
           // If the end result of toString() for each item is the same, do not
           // perform relational comparison, and do not re-order objects.
-          if (t1 === t2 && v1 === v2) return 0;
+          if (t1 === t2 && v1 === v2 || t1 === "object") return 0;
         }
       }
       if (t1 === t2) {

test/ng/filter/orderBySpec.js

@@ -115,6 +115,16 @@ describe('Filter: orderBy', function() {
       ];
       expect(orderBy(array)).toEqualData(array);
     });
+
+
+    it('should not reverse array of objects with null prototype and no predicate', function() {
+      var array = [2,1,4,3].map(function(id) {
+        var obj = Object.create(null);
+        obj.id = id;
+        return obj;
+      });
+      expect(orderBy(array)).toEqualData(array);
+    });
   });
 
 
@@ -232,5 +242,15 @@ describe('Filter: orderBy', function() {
       ];
       expect(orderBy(array)).toEqualData(array);
     });
+
+
+    it('should not reverse array of objects with null prototype and no predicate', function() {
+      var array = [2,1,4,3].map(function(id) {
+        var obj = Object.create(null);
+        obj.id = id;
+        return obj;
+      });
+      expect(orderBy(array)).toEqualData(array);
+    });
   });
 });