Hello! I am working on the freeCodeCamp challenge “Mutations”, and I’m not sure how to remove duplicate elements in an array. I tried to use `function alpha(arr)`

to check each element against each other element next to each other (since I already alphabetized the array) but it is throwing an infinite loop. Is this the right way to go about this?

**My code so far**

```
var zero = arr[0].toLowerCase();
var one = arr[1].toLowerCase();
var zeroarr = zero.split("");
var onearr = one.split("");
zeroarr.sort();
onearr.sort();
function alpha(arr) {
for(x = 0; x !== arr.size; x++) {
if(arr[x] == arr[x + 1]) {
arr.splice(x, 1);
}
}
}
alpha(zeroarr);
alpha(onearr);
var zerostring = zeroarr.toString();
var onestring = onearr.toString();
return zerostring.indexOf(onestring) !== -1;
}
mutation(["Mary", "Aarmy"]);
```

**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:**