From e048ce532b00551f464941323898ef918cf54f23 Mon Sep 17 00:00:00 2001
From: Black-Hole <158099591@qq.com>
Date: Tue, 26 Sep 2017 23:11:29 +0800
Subject: [PATCH 1/3] Update index.js

The first parameter should be judged
---
 index.js | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/index.js b/index.js
index 90f2807..86a0337 100644
--- a/index.js
+++ b/index.js
@@ -8,8 +8,10 @@
 'use strict';
 
 module.exports = function diff(arr/*, arrays*/) {
-  var len = arguments.length;
-  var idx = 0;
+  if(!Array.isArray(arr)) return arr;
+  
+  var len = arguments.length,
+      ldx = 0;
   while (++idx < len) {
     arr = diffArray(arr, arguments[idx]);
   }
@@ -20,11 +22,11 @@ function diffArray(one, two) {
   if (!Array.isArray(two)) {
     return one.slice();
   }
-
-  var tlen = two.length
-  var olen = one.length;
-  var idx = -1;
-  var arr = [];
+  
+  var olen = one.length,
+      tlen = two.length,
+      idx = -1,
+      arr = [];
 
   while (++idx < olen) {
     var ele = one[idx];

From 36af3b257b7a917984b231ab50092416f907fd1a Mon Sep 17 00:00:00 2001
From: Black-Hole <158099591@qq.com>
Date: Wed, 27 Sep 2017 01:33:53 +0800
Subject: [PATCH 2/3] Update index.js

revert this and use the same formatting as the rest of the code.
---
 index.js | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/index.js b/index.js
index 86a0337..5959884 100644
--- a/index.js
+++ b/index.js
@@ -11,7 +11,7 @@ module.exports = function diff(arr/*, arrays*/) {
   if(!Array.isArray(arr)) return arr;
   
   var len = arguments.length,
-      ldx = 0;
+  var ldx = 0;
   while (++idx < len) {
     arr = diffArray(arr, arguments[idx]);
   }
@@ -23,10 +23,10 @@ function diffArray(one, two) {
     return one.slice();
   }
   
-  var olen = one.length,
-      tlen = two.length,
-      idx = -1,
-      arr = [];
+  var olen = one.length;
+  var tlen = two.length;
+  var idx = -1;
+  var arr = [];
 
   while (++idx < olen) {
     var ele = one[idx];

From ddb57eb58deb388cc34bc95a3c1ab34f1c9286a0 Mon Sep 17 00:00:00 2001
From: Brian Woodward <brian.woodward@gmail.com>
Date: Wed, 24 Oct 2018 08:32:31 +0800
Subject: [PATCH 3/3] Update index.js

Co-Authored-By: BlackHole1 <158blackhole@gmail.com>
---
 index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 5959884..ddd58cf 100644
--- a/index.js
+++ b/index.js
@@ -10,7 +10,7 @@
 module.exports = function diff(arr/*, arrays*/) {
   if(!Array.isArray(arr)) return arr;
   
-  var len = arguments.length,
+  var len = arguments.length;
   var ldx = 0;
   while (++idx < len) {
     arr = diffArray(arr, arguments[idx]);