Hide or show objects in a list not working correctly

Questions & Answers
1

Hello ! I wrote a simple script in order to show objects in a list of 16 objects one by one when clicking a button (calling the EnableGameObjects function) and hide them one by one in the reverse order when clicking another button (calling the DisableGameObjects function). The script works, but for example when I want to disable the object I just enabled I need to press the disable button twice (the first click makes the counter count down but the object is getting disabled only on the second click).
Here is the script:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DisableOrEnableObject : MonoBehaviour
{
    public List<GameObject> MyGameObjects = new List<GameObject>(); //Creating the list of objects
  
    public int counter;

    void Start()
    {
       counter = 0;
    }

    public void EnableGameObjects()
    {
        MyGameObjects[counter].SetActive(true);
        counter++;
        if (counter > 15)
            counter = 15;
    }

    public void DisableGameObjects()
    {

        MyGameObjects[counter].SetActive(false);
        counter--;
        if (counter < 0)
            counter = 0;
    }
}

Anyone has any ideea on how can I disable the object I just enabled on the first button click ?

2

using System.Collections.Generic;
using UnityEngine;

public class DisableOrEnableObject : MonoBehaviour
{
    public List<GameObject> MyGameObjects = new List<GameObject>(); //Creating the list of objects
  
    private int lastActiveObjectIndex;

    void Start()
    {
       lastActiveObjectIndex = -1;
    }

    public void EnableGameObjects()
    {
        lastActiveObjectIndex++;
		
		if(lastActiveObjectIndex >= MyGameObjects.Count)
			lastActiveObjectIndex = MyGameObjects.Count - 1;

        MyGameObjects[lastActiveObjectIndex].SetActive(true);
    }

    public void DisableGameObjects()
    {
		if(lastActiveObjectIndex >= 0)
            MyGameObjects[lastActiveObjectIndex].SetActive(false);

        lastActiveObjectIndex--;

		if(lastActiveObjectIndex < -1)
			lastActiveObjectIndex = -1;
    }
}