diff --git a/lib/util.js b/lib/util.js
index 8f8c9b31..057ec8fa 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -533,8 +533,8 @@
             if (!Array.isArray(arr))
                 throw(Error('arr should be array!'));
             
-            arr.forEach(function(item) {
-                ret.push(item.name);
+            ret = arr.map(function(item) {
+                return item.name;
             });
             
             return ret;