unity: game object (component) pool

GameObjectPool.cs

using System.Collections.Generic;
using UnityEngine;

namespace Utilities
{
    public class GameObjectPool<T> where T : Component
    {
        private GameObject _rootObj;
        private T _spawnObject;
        private int _poolNum;
        private int _currentPickIndex = 0;
        private List<T> _poolObjects = new List<T>();

        public List<T> PoolObjects
        {
            get => _poolObjects;
        }

        public GameObject RootObj
        {
            get => _rootObj;
        }

        public int PoolNum
        {
            get => _poolNum;
        }
       
        /// <summary>
        /// 
        /// </summary>
        /// <param name="spawnObject"></param>
        /// <param name="poolNum"></param>
        /// <param name="parentTransform"></param>
        public GameObjectPool(T spawnObject, int poolNum, Transform parentTransform = null)
        {
            _spawnObject = spawnObject;
            _poolNum = poolNum;
            _rootObj = new GameObject();
            _rootObj.transform.parent = parentTransform;
            SpawnObjects();
        }

        /// <summary>
        /// 
        /// </summary>
        void SpawnObjects()
        {
            for (int i = 0; i < _poolNum; i++)
            {
                var obj = GameObject.Instantiate(_spawnObject);
                obj.transform.parent = _rootObj.transform;
                _poolObjects.Add(obj);
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        public T PickObject()
        {
            if (_poolObjects.Count < 1)
            {
                return default(T);
            }
            int index = _currentPickIndex;
            _currentPickIndex = (_currentPickIndex + 1) % _poolObjects.Count;
            return _poolObjects[index];
        }

        /// <summary>
        /// 
        /// </summary>
        public void DestroyObjects()
        {
            foreach (Transform child in _rootObj.transform)
            {
                GameObject.Destroy(child.gameObject);
            }
        }

        /// <summary>
        /// 
        /// </summary>
        public void DestroyPool()
        {
            GameObject.Destroy(_rootObj);
        }
    }
}