Rock Object Pool

using UnityEngine;
using System.Collections;

public class RockPool : MonoBehaviour {

	static int numRocks = 1000;
	public GameObject rockPrefab;
	static GameObject[] rocks;

	void Start ()
	{
		//Setting array size to numRocks size
		rocks = new GameObject [numRocks];

		for (int i = 0; i < numRocks; i++)
		{
			rocks [i] = (GameObject) Instantiate(rockPrefab, Vector3.zero, Quaternion.identity);
			rocks [i].SetActive (false);
		}
	}


	static public GameObject getRock()
	{
		for (int i = 0; i < numRocks; i++)
		{
			if (!rocks [i].activeSelf)
			{
				return rocks [i];
			}
		}
		return null;
	}


	public void GenerateRocks()
	{

	}
}