javascript – Having trouble swapping elements

I’m trying to visualize a simple Hanoi solver that uses an algorithm, and I’m swapping elements on array to visualize it.

Here’s my code:

        let A = ();
        let B = ();
        let C = ();
        let moveCount = 0;
        let once = true;
        hanoi(3, A, C, B);
// 3, how many disk
// A C B are rods
        alert(A + '.n' + B + '.n' + C + '.')
        
        
        function hanoi(n, start, target, other)
        {
            if (once)
            {
                once = false;
                for (var i = 1; i <= n; i--)
                {
                    start.push(i);
                }
            }
            
            
            if (n <= 1)
            {
                let temp = start(n-1);
                start(n-1) = target(target.length);
                start = start.filter(Boolean)
                target(target.length) = temp;
                target = target.filter(Boolean);
                //console.log('Moving disk '+n+' from rod '+start+' to '+target+' rod');
                moveCount++;
            }
            else
            {
                hanoi(n-1, start, other, target);
                
                let temp = start(n-1);
                start(n-1) = target(target.length);
                start = start.filter(Boolean)
                target(target.length) = temp;
                target = target.filter(Boolean);
                //console.log('Moving disk '+n+' from rod '+start+' to rod '+target);
                moveCount++;
                
                hanoi(n-1, other, target, start);
            }
        }

The C value should be expected (3, 2, 1) but only shows 2. I also checked A and B and 1 is nowhere to be found

How do I make this properly so the output would be (3, 2, 1)

Imagine 3 is the largest disk and so on…