Basic Algorithm Return Largest Numbers in Arrays

I don’t know the reason why i get wrong with this code!

anyone can help me fix it and show me the errors here please ha!

function largestOfFour(arr) {
  var newarr =[];
  for(var i =0;i<4;i++){
    var largest = 0; 
    for( var j =0; j < arr[i].length;j++){
      if(largest < arr[j]){
       largest = arr[j]; 
  return newarr;

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

You’re not accessing the subarrays. You have to use the format array[i][j] to access the subarray.

I believe it wants an array of values, one for each subarray.

Instead of using arr[j], which is grabbing the whole sub array at index j, use arr[i][j] which is grabbing the value of index j in sub array i which is what you want.
So inside your inner loop:
for( var j =0; j < arr[i].length;j++){
if (largest < arr[i][j]) {

largest = arr[i][j];


thanks for your help

I’ve edited your post for readability. When you enter a code block into the forum, remember to precede it with a line of three backticks and follow it with a line of three backticks to make easier to read. See this post to find the backtick on your keyboard. The “preformatted text” tool in the editor (</>) will also add backticks around text.