How to determine when for-loop is done

[Mudbill]

So you're using a dynamic indexing system? It will, on-the-run, assign a number to an enemy spawned whenever they are, and check if the number is in use? You might also have a script which removes an enemy, and thus clears its index value, making it available for the next enemy?

Dunno what it is used for, but I can see why it would be useful. Indexes are super helpful.