diff --git a/src/js/.idea/workspace.xml b/src/js/.idea/workspace.xml
diff --git a/src/js/compile.js b/src/js/compile.js
diff --git a/src/js/index.html b/src/js/index.html
@@ -23,7 +23,8 @@
 </head>
 <script type="text/template" id="program-body">
  X ={
-    "id": 1
+    "id": 1,
+    "data":2
     };
 
     //1,2,3,4

diff --git a/src/js/parse.js b/src/js/parse.js
@@ -375,7 +375,7 @@ var make_parse = function () {
     //     }
     //     return this;
     // });
-    infix(",", 20);
+    //infix(",", 20);
     infix("[", 80, function (left) {
         this.first = left;
         this.second = expression(0);
@@ -452,26 +452,26 @@ var make_parse = function () {
     prefix("-");
     prefix("typeof");
 
-    // prefix("(", function () {
-    //     var a = [];
-    //     while (true) {
-    //         a.push(expression(0));
-    //         if (token.id !== ",") {
-    //             break;
-    //         }
-    //         advance(",");
-    //     }
+    prefix("(", function () {
+        var a = [];
+        while (true) {
+            a.push(expression(0));
+            if (token.id !== ",") {
+                break;
+            }
+            advance(",");
+        }
 
-    //     advance(")");
+        advance(")");
 
-    //     if(a.length == 1) {
-    //         return a[0];
-    //     }
+        if(a.length == 1) {
+            return a[0];
+        }
 
-    //     this.first = a;
-    //     this.arity = "unary";
-    //     return this;
-    // });
+        this.first = a;
+        this.arity = "unary";
+        return this;
+    });
 
    prefix("(", function () {
         var e = expression(0);

diff --git a/src/script/proto/obin/obin/runtime/lexical_environment.py b/src/script/proto/obin/obin/runtime/lexical_environment.py
@@ -5,9 +5,6 @@ class EnvironmentRecord(object):
     def has_binding(self, identifier):
         return False
 
-    def create_binding(self, identifier):
-        raise NotImplementedError
-
     def set_binding(self, identifier, value):
         raise NotImplementedError
 
@@ -32,26 +29,15 @@ def has_binding(self, identifier):
     def _get_binding(self, name):
         return self.bindings.get(name)
 
-    def _add_binding(self, name, value):
-        self.bindings.add(name, value)
-
     def _set_binding(self, name, value):
-        self.bindings.set(name, value)
+        self.bindings.add(name, value)
 
     def _del_binding(self, name):
         self.bindings.delete(name)
 
-    # 10.2.1.1.2
-    def create_binding(self, identifier):
-        from obin.objects.object_space import newundefined
-        assert identifier is not None and isinstance(identifier, unicode)
-        assert not self.has_binding(identifier)
-        self._add_binding(identifier, newundefined())
-
     # 10.2.1.1.3
     def set_binding(self, identifier, value):
         assert identifier is not None and isinstance(identifier, unicode)
-        assert self.has_binding(identifier)
         self._set_binding(identifier, value)
 
     # 10.2.1.1.4
@@ -80,15 +66,6 @@ def has_binding(self, n):
         bindings = self.binding_object
         return bindings.has_property(n)
 
-    # 10.2.1.2.2
-    def create_binding(self, n):
-        from obin.objects.object_space import newundefined
-        assert n is not None and isinstance(n, unicode)
-        bindings = self.binding_object
-        assert bindings.has_property(n) is False
-
-        bindings.put(n, newundefined())
-
     # 10.2.1.2.3
     def set_binding(self, n, v):
         assert n is not None and isinstance(n, unicode)