Question How to get the number of items in an array (C#)

I'm trying to make a system that lets you beat the level after you kill all the enemies, but I can't b/c I don't know how to get the number of items in an array

here's what I'm planning

Code (CSharp):

1. using UnityEngine.SceneManagement;
2. using UnityEngine;
3.  
4. public class DeathManager : MonoBehaviour
5. {
6.     bool isNull;
7.     GameObject[] enemies;
8.     void Start() {
9.         enemies = GameObject.FindGameObjectsWithTag("Enemy");
10.     }
11.     void Update() {
12.         if(/*checking how many items are in the array*/) {
13.             //doing something based off that
14.         }  
15.     }
16. }
17.  

 

With Arrays you can use .Length
Lists have .Count

The enemies array you have is created once and wont change when you kill enemies though.

You might want to recalculate this array every frame (which is horrible btw).
Better solution is to use a List instead of Array and have the enemies remove themself then they die.

 

I've never used lists before, how do you make list and add things to them?

 

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1

 

how do you add and remove game objects, I'm trying to add all game objects with the tag enemies but I can't since that's an array. But if I make it a list of arrays I can't remove the dead enemies.

Code (CSharp):

1. using UnityEngine.SceneManagement;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class DeathManager : MonoBehaviour
6. {
7.     bool isNull;
8.     public List<GameObject> enemies = new List<GameObject>();
9.     void Start() {
10.         enemies.Add(GameObject.FindGameObjectsWithTag("Enemy"));
11.     }
12.     void Update() {
13.         if(enemies.Count == 0) {
14.             //doing something based off that
15.         }  
16.     }
17. }
18.  

 

Add is for single elements. AddRange is for IEnumerables, ie Collections, which is also what Arrays are.
https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1.addrange?view=net-5.0

The first example basically does just that.