Drill 23: Real project — Builds and performance

using System.Collections.Generic;
using UnityEngine;

public class Pool : MonoBehaviour
{
    [SerializeField] private GameObject prefab;
    private readonly Queue<GameObject> available = new();

    public GameObject Get()
    {
        if (available.Count > 0) return available.Dequeue();
        return Instantiate(prefab);
    }

    public void Return(GameObject item)
    {
        item.SetActive(false);
        available.Enqueue(item);
    }
}