How to spawn once ?,How to create once ?

Questions & Answers
1

as you see and sorry for my bad english.

there are too many helmets displayed but there is 1 on the place.

[123715-screenshot-20180901020348.png*_|123715]

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

public class PlayerCheck : MonoBehaviour {

    public GameObject[] nearbyitems;
    public GameObject[] listparentchildsobj;
    public Transform listparent;
    public GameObject objprefab;
    public Item[] items;

    public GameObject playerpanel;

	void Start () {
		
	}
	
    
	
	void Update () {
        listparentchildsobj = new GameObject[listparent.childCount];
        for (int i = 0; i < listparent.childCount; i++)
        {
            listparentchildsobj *= listparent.GetChild(i).gameObject;*

}

if (nearbyitems.Length == 0)
{
for (int i = 0; i < listparentchildsobj.Length; i++)
{
Destroy(listparentchildsobj*.gameObject);*
}
items = new Item[0];
}

if (nearbyitems.Length > 0)
{
items = new Item[nearbyitems.Length];
for (int i = 0; i < nearbyitems.Length; i++)
{
items = nearbyitems*.GetComponent();*
}
}

if (Input.GetKeyDown(KeyCode.Tab))
{
playerpanel.transform.gameObject.SetActive(!playerpanel.activeInHierarchy);
}

for (int i = 0; i < items.Length; i++)
{
GameObject prefab = Instantiate(objprefab, listparent); //here
prefab.GetComponent().Set(items*.weapon);*
}
}
}
_*

2

items array length never goes to 0, so every frame you instantiate the amount inside the array.