# Diff Two Array code not working on FCC

**URL:** <https://forum.freecodecamp.org/t/diff-two-array-code-not-working-on-fcc/150962>\
**Category:** General\
**Created:** [October 2, 2017, 11:53am UTC](https://forum.freecodecamp.org/t/diff-two-array-code-not-working-on-fcc/150962 "2017-10-02T11:53:37Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![ishmark](https://avatars.discourse-cdn.com/v4/letter/i/ecd19e/32.png) [@ishmark](https://forum.freecodecamp.org/u/ishmark)\
**Post date:** [October 2, 2017, 11:53am UTC](https://forum.freecodecamp.org/t/diff-two-array-code-not-working-on-fcc/150962/1 "2017-10-02T11:53:37Z")

</div>

\*\*Code is running fine in google chrome but not passing test cases on free code camp, and no error is displayed \*\*

**Your code so far**

```auto
  var items = [];
  var newArr = arr1.concat(arr2);
  items = newArr.filter(function(doge){
    return !arr1.includes(doge) || !arr2.includes(doge);
  });
}

// test here
diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]);

```

**Your browser information:**

Your Browser User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36`.

**Link to the challenge:**  
[https://www.freecodecamp.org/challenges/diff-two-arrays](https://www.freecodecamp.org/challenges/diff-two-arrays)

---

<div class="post-metadata">

**Author:** ![ishmark](https://avatars.discourse-cdn.com/v4/letter/i/ecd19e/32.png) [@ishmark](https://forum.freecodecamp.org/u/ishmark)\
**Post date:** [October 2, 2017, 11:59am UTC](https://forum.freecodecamp.org/t/diff-two-array-code-not-working-on-fcc/150962/2 "2017-10-02T11:59:26Z")

</div>

Silly mistake i was not returning items array after filtering it

---

<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:** [January 17, 2021, 8:38pm UTC](https://forum.freecodecamp.org/t/diff-two-array-code-not-working-on-fcc/150962/3 "2021-01-17T20:38:30Z")

</div>

Closed on January 17, 2021, 8:38pm UTC