ScriptableObjectsAsDatabase

using UnityEngine;
using UnityEditor;
using System.IO;

public class CreateItemData
{
    [MenuItem("Assets/Create/Item Data")]
    public static void MakeItemData()
    {
        string name = "ItemData";
        ItemData asset = ScriptableObject.CreateInstance<ItemData>();
        AssetDatabase.CreateAsset(asset, string.Format("Assets/ScriptableObjects/{0}.asset", name));
        AssetDatabase.SaveAssets();
        EditorUtility.FocusProjectWindow();
        Selection.activeObject = asset;
    }
}


using UnityEngine;

[System.Serializable]
public class Item
{
    public string Name;
    public ItemType ItemType;
    public Sprite Sprite;
    public GameObject Prefab;
    public int level;

    public float Damage
    {
        get
        {
            return level * 5;
        }
    }
}

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

public class ItemGenerator : MonoBehaviour
{
    public ItemData itemData;
    public Transform[] positions;

    private void Start()
    {
        for (int i = 0; i < positions.Length; i++)
        {
            GameObject item = Instantiate(itemData.ItemOfType((ItemType) i).Prefab, positions[i]);
            item.transform.localPosition = Vector3.zero;
        }
    }
}

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

public class ItemsUIDisplayController : MonoBehaviour
{
    public ItemData itemData;
    public Image[] itemDisplays;

    private void Start()
    {
        for (int i = 0; i < itemDisplays.Length; i++)
        {
            itemDisplays[i].sprite = itemData.ItemOfType((ItemType) i).Sprite;
        }
    }
}