# Why does this code not pass?

**URL:** <https://forum.freecodecamp.org/t/why-does-this-code-not-pass/446427>\
**Category:** Curriculum Help\
**Tags:** javascript\
**Created:** [February 15, 2021, 4:11pm UTC](https://forum.freecodecamp.org/t/why-does-this-code-not-pass/446427 "2021-02-15T16:11:39Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![michaelpetrick](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/michaelpetrick/32/134175_2.png) [@michaelpetrick](https://forum.freecodecamp.org/u/michaelpetrick)\
**Post date:** [February 15, 2021, 4:11pm UTC](https://forum.freecodecamp.org/t/why-does-this-code-not-pass/446427/1 "2021-02-15T16:11:39Z")

</div>

Hello!

This code returns all the right answers, but still does not pass the test. Can someone please explain why?

Thanks a lot!

```
  **Your code so far**

```

```js

var finalArr = [];
var checkedArr = [];
var regX = /[A-Za-z0-9]/;

function palindrome(str) {
var arr = str.toLowerCase().split("");
for (var i = 0; i < arr.length; i++) {
    if (regX.test(arr[i])) {
    checkedArr.push(arr[i]);
    finalArr.unshift(arr[i]);
    }
} if (finalArr.join("") === checkedArr.join("")) {
  return true;
} else {
  return false;
};
}

palindrome("eye");

```

```
  **Your browser information:**

```

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36`.

**Challenge:** Palindrome Checker

**Link to the challenge:**

> **[freeCodeCamp.org](https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/palindrome-checker)**
>
> Learn to Code — For Free

---

<div class="post-metadata">

**Author:** ![ILM](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/ilm/32/363239_2.png) [@ILM](https://forum.freecodecamp.org/u/ILM)\
**Post date:** [February 15, 2021, 4:14pm UTC](https://forum.freecodecamp.org/t/why-does-this-code-not-pass/446427/2 "2021-02-15T16:14:31Z")

</div>

Your code contains global variables that are changed each time the function is run. This means that after each test completes, subsequent tests start with the previous value. To fix this, make sure your function doesn’t change any global variables, and declare/assign variables within the function if they need to be changed.

Example:

```javascript
var myGlobal = [1];
function returnGlobal(arg) {
  myGlobal.push(arg);
  return myGlobal;
} // unreliable - array gets longer each time the function is run

function returnLocal(arg) {
  var myLocal = [1];
  myLocal.push(arg);
  return myLocal;
} // reliable - always returns an array of length 2

```

---

<div class="post-metadata">

**Author:** ![michaelpetrick](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/michaelpetrick/32/134175_2.png) [@michaelpetrick](https://forum.freecodecamp.org/u/michaelpetrick)\
**Post date:** [February 15, 2021, 4:17pm UTC](https://forum.freecodecamp.org/t/why-does-this-code-not-pass/446427/4 "2021-02-15T16:17:42Z")

</div>

Thank you very much for the fast reply!

---

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/freecodecamp/original/3X/e/1/e1c433102e34b46dfaa3e15d13ab9a514b127078.svg) [@system](https://forum.freecodecamp.org/u/system)\
**Post date:** [August 17, 2021, 4:18am UTC](https://forum.freecodecamp.org/t/why-does-this-code-not-pass/446427/5 "2021-08-17T04:18:01Z")

</div>

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