Keeping one enemy object active at a time

Question

I have a scene with a few different enemies in it, the scene starts with one enemy active with the others waiting around. I would like the next enemy in the array to come to life when the last enemy gets destroyed. Could anyone help me out with some logic for this situation as I'm a bit stumped at the moment.

I have this so far which keeps my first enemy active while the others are temporarily disabled:

Edit3

I'm heading out for a while, this is all the relevant code to the question, if anyone could help me out, i'd greatly appreciate it. I now have the number starting at 0 and increasing to 1 when the ship hits a bullet but, the Debug.Log in the Update, constantly outputs 0 at the beginning, but when my trigger is activated and the number changes to 1, it only shows it once and then I get nothing from the console when really it should repeat 1 constantly, just in case that's relevant:

     using UnityEngine;
 using System.Collections;
 
 public class EnemyAI : MonoBehaviour {
     
 
     public bool isActive = true;
 
     public int shipCount = 13;
 
     string shipName = "ship";
     int num = 0;
 
     void Start()
     {
         //Sets ship 0 to true, leaving the rest at false
         if(gameObject.tag == shipName + num)
         {
             isActive = true;
         }
         else
             isActive = false;
     }
 
     void Update()
     {
         Debug.Log (shipName + num);
         if(gameObject.tag == shipName + num && isActive == false)
         {
             isActive = true;
         }
         
         if(isActive == false)
         {
             GetComponent<EnemyAI>().enabled = false;
         }
         else
             GetComponent<EnemyAI>().enabled = true;
     }
 
     void OnTriggerEnter(Collider collide)
     {
         if(gameObject.tag == shipName + num && isActive == true)
         {
             if(collide.gameObject.tag == "bullet")
             {
                 isActive = false;
                 num++;
             }
         }
     }
 }

Answer 1

This is how I would think about it. Have an Enemy AI script as you have one and then an Enemy manager.

So the Enemy AI script, controls the action of the object and let it do its thing. Ignoring whether it needs to be active at a certain time. Let the enemy manager take care of that.

Now the Enemy manager...

It contains the array of enemy objects. If an enemy dies, the Enemy AI script should notify the manager that it just died. Then from that point, the manager will then clean up the enemy or whatever. Then, gets the next available enemy, if any exist, then either add the component or better yet just pool* the already destroyed object. If these enemy's are not seen on the screen all at once, this would be cost efficient. Or just reuse the same Enemy AI component so you don't need to waste memory creating and destroying, again pooling*. Now, the Enemy is object don't forget to set up whatever other things you need and re-position if need be. Then let the enemy be.

This will continue to work until there are no more enemy in the container.

Hope this has helped.

* Here is a simple script I created to handle pooled objects.

Simple Object Pooling

Keeping one enemy object active at a time

Edit3

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