Inventory.cs

using UnityEngine;

public class Inventory : MonoBehaviour
{

    [SerializeField] private ItemData[] m_inventory;
    [SerializeField] private ushort m_capacity;
    private ushort m_count;
    private bool m_isFull;

    private void Start()
    {
        m_inventory = new ItemData[m_capacity];
    }

    private void Update()
    {
        // Todo: Remove, only for testring purposes.
        if (Input.GetKeyDown(KeyCode.Alpha1))
        {
            DropItem(0);
        }

        if (Input.GetKeyDown(KeyCode.Alpha2))
        {
            DropItem(1);
        }

        if (Input.GetKeyDown(KeyCode.Alpha3))
        {
            DropItem(2);
        }

        if (Input.GetKeyDown(KeyCode.Alpha4))
        {
            DropItem(3);
        }
    }

    public bool AddItem(ItemData item)
    {
        if (!m_isFull)
        {
            m_count++;
            if (m_count == m_capacity)
                m_isFull = true;

            m_inventory[m_count] = item.Copy();
            return true;
        }
        else
            return false;
    }

    public bool DropItem(ushort index)
    {
        GameObject instance = Instantiate(m_inventory[index].prefab, transform.position, Quaternion.identity, GameObject.Find("Items").transform); // Todo: Remove Find.
        if (instance != null)
        {
            EraseItem(index);
            return true;
        }
        else
        {
            return false;
        }
    }

    public void EraseItem(ushort index)
    {
        m_inventory[index] = null;
    }

    public bool MoveItem(ushort index, Inventory target)
    {
        if (target.AddItem(m_inventory[index]))
        {
            EraseItem(index);
            return true;
        }
        else
        {
            return false;
        }
    }

    public ItemData GetItem(ushort index)
    {
        return m_inventory[index];
    }

}