**Tell us what’s happening:**

Having trouble with last 2 numbers in the 3rd array… For some reason I think it’s pushing 5 into nextArr variable but it’s getting spliced again.

I am failing this test case

sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5]) should return [1, 4, 5].

**Your code so far**

```
function sym() {
let newArr = [];
let nextArr = [];
let arr = Array.from(arguments);
for(let i=0; i<arr[0].length; i++) {
if(arr[1].indexOf(arr[0][i]) < 0 && newArr.indexOf(arr[0][i]) < 0) newArr.push(arr[0][i]);
}
for(let j=0; j<arr[1].length; j++) {
if(arr[0].indexOf(arr[1][j]) < 0 && newArr.indexOf(arr[1][j]) < 0) newArr.push(arr[1][j]);
}
for(let i=2; i<arr.length; i++) {
for(let j=0; j<arr[i].length; j++){
if(newArr.indexOf(arr[i][j]) < 0 && nextArr.indexOf(arr[i][j]) < 0)
nextArr.push(arr[i][j]);
else{
console.log("index " + nextArr.indexOf(arr[i][j]) + " val " + arr[i][j])
if(newArr.indexOf(arr[i][j]) >= 0) {
newArr.splice(newArr.indexOf(arr[i][j]), 1);
}
else{
nextArr.splice(nextArr.indexOf(arr[i][j]), 1)
}
}
console.log("j is " + j + " newArr " + newArr)
}
}
console.log("newArr " + newArr)
console.log("nextArr " + nextArr)
return newArr.concat(nextArr).sort((a,b) => a-b);
}
sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5])
```

**Your browser information:**

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36`

.

**Link to the challenge:**

https://learn.freecodecamp.org/coding-interview-prep/algorithms/find-the-symmetric-difference