Anything wrong with this solution?

I see a lot of people are using math.max and/or nested for loops, is my approach to this challenge wrong? is it less efficient?
edit: my solution worked and did solve the problem

Any thoughts are appreciated.

function largestOfFour(arr) {
let largest = [];
for (let elem of arr) {
  elem.sort(function(a, b){return b-a});
return largest;

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

Challenge: Return Largest Numbers in Arrays

Link to the challenge:

Personally, I don’t like approaches that change the input data.

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