ObjectPooler.cs

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

public class ObjectPooler : MonoBehaviour
{
    public GameObject pooledObject;
    public int pooledAmount;
    List<GameObject> pooledObjects;

    // Start is called before the first frame update
    void Start()
    {
        pooledObjects = new List<GameObject>();
        for (int i = 0; i < pooledAmount; i++)
        {
            GameObject obj = Instantiate(pooledObject);
            obj.SetActive(false);
            pooledObjects.Add(obj);
        }
    }

    public GameObject GetPooledObject()
    {
        // Loop through the pooled objects and return the first inactive one
        for (int i = 0; i < pooledObjects.Count; i++)
        {
            if (!pooledObjects[i].activeInHierarchy)
            {
                return pooledObjects[i];
            }
        }

        // If no inactive object is found, instantiate a new one
        GameObject newObj = Instantiate(pooledObject);
        newObj.SetActive(false);
        pooledObjects.Add(newObj);
        return newObj;
    }
}