diff --git a/index.js b/index.js
index 90f2807..ddd58cf 100644
--- a/index.js
+++ b/index.js
@@ -8,8 +8,10 @@
 'use strict';
 
 module.exports = function diff(arr/*, arrays*/) {
+  if(!Array.isArray(arr)) return arr;
+  
   var len = arguments.length;
-  var idx = 0;
+  var ldx = 0;
   while (++idx < len) {
     arr = diffArray(arr, arguments[idx]);
   }
@@ -20,9 +22,9 @@ function diffArray(one, two) {
   if (!Array.isArray(two)) {
     return one.slice();
   }
-
-  var tlen = two.length
+  
   var olen = one.length;
+  var tlen = two.length;
   var idx = -1;
   var arr = [];