Largest Numbers in Arrays(Not passing)

JavaScript
1 
function largestOfFour(arr) {
  // You can do this!
  let newArr = [];
  for(let i = 0;i<arr.length;i++){
   // console.log(arr[i]);
    //newArr.push(arr[i]);
    let power = Math.max.apply(Math,arr[i]);
    //console.log(power);
    newArr.push(power);  
  }
  
  console.log(newArr);
  return arr;
}

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

Its working but not passing tests.

2

Your function is returning arr and not newArr.

Also, Math.max.apply(Math,arr[i]);

should be:

Math.max.apply(null, arr[i]);

3

It worked thanks for your suggestion