javascript – Unable to Access multidimensional array elements of SharePoint CAML query

The following code outputs a comma separated array for the var cats. The array has six items as the list “banner” has two columns and three rows of items. I can access the array items in the first row by entering cats(0)(0) and cats(0)(1). However, when I attempt to access the array items in rows 2 or 3 by doing cats(1)(0),cats(1)(1),cats(2)(0) or cats(2)(1) the array comes up empty. Can someone help me understand why please?

<script src="/Utilities/jquery.min.js"></script>
<p style="font-size:20px;" width="500px;" id="Ptask"></p>
<script>

SP.SOD.executeOrDelayUntilScriptLoaded(retrivetasklistitems, 'SP.js');


var colltaskListItem;
var listItemArray = ();

        function retrivetasklistitems() {
            var clientContext = new SP.ClientContext.get_current();
            var oList = clientContext.get_web().get_lists().getByTitle('banner');
    
            var camlQuery = new SP.CamlQuery();
            camlQuery.set_viewXml(
                '<View><Query><Where><IsNotNull><FieldRef Name="Url"/></IsNotNull></Where></Query></View>'
            );

            this.colltaskListItem = oList.getItems(camlQuery);
            clientContext.load(colltaskListItem);

            /* execute the query to get the loaded items */
            clientContext.executeQueryAsync(
                /* onSuccess Function */ 
                Function.createDelegate(this, this.OnQuerySucceeded), 
                /* onFail Function */ 
                Function.createDelegate(this, this.onQueryFailed)
            ); 
    
        }

        function OnQuerySucceeded(sender, args) {

            var count = 0; // for directory list
            var listItemEnumerator = colltaskListItem.getEnumerator();

            while (listItemEnumerator.moveNext()) {
                var oListItem = listItemEnumerator.get_current();
                var title = oListItem.get_item('Title');
                var url = oListItem.get_item('Url');


            var categories = (title, url);
                
            listItemArray(count) = new Array(2);
            for (var i = 0; i<listItemArray(count).length; i++) {

                if(categories(i) == null || categories(i) == undefined) {
                    listItemArray(count)(i) = " ";
                } else {
                    listItemArray(count)(i) = categories(i);
                }
            }
            count++;

            var cats = listItemArray

            var tasks = '';
            tasks = "<p>" + cats + "</p>" + "<br />";

            }
            $("#Ptask").html(tasks);
            }

            function OnQueryFailed(sender, args) {
                alert('Error: ' + args.get_message() + 'n' + args.get_stackTrace());
            }
</script>