# JavaScript : Remove all duplicate elements from the internal arrays of the given 2-D array

You have to remove all duplicate elements from the internal arrays of the given 2-D array.

2-D Array

```[[1,2,3,8,1,2], [54,26,14,54], [81,4,6,84]]
```

Internal arrays

```[1,2,3,8,1,2], [54,26,14,54] and [81,4,6,84]
```

So the output should be something along the lines of

```[[1,2,3,8],[54,26,15],[81,4,6,84]]
```

Code:

```var twoD = [[1,2,3,8,1,2], [54,26,14,54], [81,4,6,84]];
function deleteDuplicate (twoD) {
let uniqueArr = []; //init empty array
for(var i=0;i<twoD.length;i++){
for(let j of twoD[i]) {
if(uniqueArr.indexOf(j) === -1) {
uniqueArr.push(j);
}
}
}
return uniqueArr;
}

console.log(deleteDuplicate(twoD));```

My code `returns` a single array with `[1,2,3,8,54,26,15,81,4,6,84]` as values.

I know the issues lie in the pushing but I am unable to think of anyway, how should I do it?

You can use Set.

```const arr = [[1,2,3,8,1,2], [54,26,14,54], [81,4,6,84]];

function beUnique(arr){
const res = arr.map((a)=>{
const unique = new Set(a);
return Array.from(unique);
});
console.log(res);
}

beUnique(arr);```