# Basic Algorithm Scripting - Return Largest Numbers in Arrays

Tell us what’s happening:
Describe your issue in detail here.
I spend the whole day trying to figure this out, firstly I understood it wrong, I thought It asks for the biggest number in a total of each array and prints out the biggest, which you can tell by code.
But it is asking for which subset is the largest, I was thinking of doing total and updating the key of the `obj` and then checking with `Object.keys` and using `Math.max`.

I am lost on how to update the object key with total value of items in array or am I thinking wrong?

``````function largestOfFour(arr) {
//loop over each set of array
let count = 0;
let total = 0;
let totalArray = []
let obj = {

}
//create object
for(let i = 0; i < arr.length;i++){
obj[i] = arr[i]
}
//loop over object
for(let number in obj){
//assign each array dataset to arr
const arr = obj[number];
for(let i = 0; i < arr.length; i++){
total += arr[i]
totalArray.push(total)
}

count +=1

}
//grab the higest number is total

return arr;
}

largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);
``````

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Challenge: Basic Algorithm Scripting - Return Largest Numbers in Arrays