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function largestOfFour(arr) {
  // You can do this!
  var newArr = [];
  for(var x = 0; x < arr.length; x+=1){
    var max = 0; 
    
    for(var y = 0; y < arr[x].length; y+=1){
      if (arr[x][y] > max) {
        max = arr[x][y];
      } 
    } 
    newArr.push(max);
  }
  return newArr;
}

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