A solution to FCC challenge

Return Largest Numbers in Arrays

function largestOfFour(arr) {
  // You can do this!
  
  var result = [];
  for (var i = 0; i < arr.length; i++)    {
    
    var largest = 0;
    for (var j = 0; j < arr[i].length; j++)    {
      
      if (arr[i][j] > largest)    {
        
        largest = arr[i][j];
      }
    }
    result[i] = largest;
  }
  return result;
}

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