### Tell us what’s happening:

I found a method which help me to remove all duplicates elements but they still telling me that it’s not good. But they say that we’re free to use any method. Can someone help to find another look for this problem

### Your code so far

```
<!-- file: index.html -->
```

```
/* file: styles.css */
```

```
/* file: script.js */
// User Editable Region
const spreadsheetFunctions = {
sum,
average,
median,
even: nums => nums.filter(isEven),
someeven: nums => nums.some(isEven),
everyeven: nums => nums.every(isEven),
firsttwo: nums => nums.slice(0, 2),
lasttwo: nums => nums.slice(-2),
has2: nums => nums.includes(2),
increment: nums => nums.map(num => num + 1),
random: ([x, y]) => Math.floor(Math.random() * y + x),
range: nums => range(...nums),
nodupes: nums => {
for(let i = 0; i < nums.length; i++){
const firstIndex = nums.indexOf(nums[i], 0)
let lastIndex = nums.lastIndexOf(nums[i], -1)
if(lastIndex > firstIndex){
nums.splice(lastIndex, 1)
deleteDoubleValue(nums)
}
}
return nums
}
}
// User Editable Region
```

### Your browser information:

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36`

### Challenge Information:

Learn Functional Programming by Building a Spreadsheet - Step 102