From 65a92f7ef9c7f145feb52cfb3c56c04fdf5b2802 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cezary=20Wa=C5=9B?=
 <44169282+Qondor@users.noreply.github.com>
Date: Mon, 22 Apr 2019 07:55:30 +0200
Subject: [PATCH] Defining variables (#35891)

biString, uniString and i should be defined.
---
 .../intermediate-algorithm-scripting/binary-agents/index.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/guide/english/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents/index.md b/guide/english/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents/index.md
index 81e9dc981b..3f29d2957a 100644
--- a/guide/english/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents/index.md
+++ b/guide/english/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents/index.md
@@ -41,13 +41,13 @@ Make sure that each time you transcode a character from binary to decimal, you r
 ## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
 ```javascript
     function binaryAgent(str) {
-      biString = str.split(' ');
-      uniString = [];
+      var biString = str.split(' ');
+      var uniString = [];
 
     /*using the radix (or base) parameter in parseInt, we can convert the binary
       number to a decimal number while simultaneously converting to a char*/
 
-      for(i=0;i < biString.length;i++){
+      for(var i=0;i < biString.length;i++){
         uniString.push(String.fromCharCode(parseInt(biString[i], 2)));
       }