Steps for implementing the Object Pool pattern

This section's code example should be relatively straightforward and we should be able to complete it in two steps, as follows:

1. Let's start by implementing our drone, as this is the entity that we will pool. Because it is such a lengthy class, we are going to split it into two segments. You can see the first segment here: 

using UnityEngine;
using UnityEngine.Pool;
using System.Collections;

namespace Chapter.ObjectPool 
{
    public class Drone : MonoBehaviour 
    {
        public IObjectPool<Drone> Pool { get; set; }

        public float _currentHealth;

        [SerializeField] 
        private float maxHealth = 100.0f;

        [SerializeField] 
        private float timeToSelfDestruct = 3.0f;

        void Start() 
        {
            _currentHealth = maxHealth;
        }

        void OnEnable() 
        {
            AttackPlayer();
            StartCoroutine(SelfDestruct());
        }

        void OnDisable() 
        {
            ResetDrone...