i cant seem to make my code work help me please

Questions & Answers
1

the AddToInventory thing needs a argument but i know only 3 arguments non of them is working here is the code:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class InventorySystem : MonoBehaviour
{
   
   public static InventorySystem Instance { get; set; }
 
    public GameObject inventoryScreenUI;

    public bool isOpen;

    public List<GameObject> slotList = new List<GameObject>();

    public List<string> itemList = new List<string>();

    private GameObject itemToAdd;

    private GameObject whatSlotToEquip;

    //public bool isFull;
 
 
    private void Awake()
    {
        if (Instance != null && Instance != this)
        {
            Destroy(gameObject);
        }
        else
        {
            Instance = this;
        }
    }

 
    void Start()
    {
       
        isOpen = false;

        PopulateSlotList();


        
    }

        // it makes it so i dont need to drag and drop the slots to the slotlist [DOES NOT WORK NOW]
    private void PopulateSlotList()
    { 
       foreach (Transform child in inventoryScreenUI.transform)
       {

          if (child.CompareTag("Slot"))
          { 
           Debug.Log("slotlist is working");
             slotList.Add(child.gameObject);
          }
       }
    }
 
 // makes it so i can open the inventory
    void Update()
    {
 
        if (Input.GetKeyDown(KeyCode.E) && !isOpen)
        {
 
			Debug.Log("E is pressed");
            Cursor.lockState = CursorLockMode.None;
            inventoryScreenUI.SetActive(true);
            isOpen = true;
 
        }
        else (Input.GetKeyDown(KeyCode.E) && isOpen);
        {
            Cursor.lockState = CursorLockMode.Locked;
            inventoryScreenUI.SetActive(false);
            isOpen = false;
        }

 
         AddToInventory(,itemName);
        { 
   
               isFull = true;
       
                Debug.Log("inventory is full");
 
         whatSlotToEquip = FindNextEmptySlot();

         itemToAdd = Instantiate(Resources.Load<GameObject>(itemName), whatSlotToEquip.transform.position, whatSlotToEquip.transform.rotation);
         itemToAdd.transform.SetParent(whatSlotToEquip.transform);

         itemList.Add(itemName);
           
          
        
           
        }
    }

    public bool CheckIsFull()
    { 

        isFull =true;

       int counter = 0;

       foreach (GameObject slot in slotList)
       { 
          if (slot.transform.childCount >0)
          { 
             counter == 1;
          } 

       }
       if (counter == 21)
          { 
             return true;
          }
          else
          { 
              return false;
          }   
    }

    private GameObject FindNextEmptySlot()
    { 
       
       foreach(GameObject slot in slotList)
       { 
         Debug.Log("2");
          if (slot.transform.childCount == 0)
          { 
            Debug.Log("working 2");
             return slot;
          }
       }

       return new GameObject();
    }
 
}
2

Lots of issues here, you are trying to define a method in another method for one, and you don’t give a return type for it either. All methods need a return type, if they return nothing then the type is void. Also if your inventory is full, it prints inventory is full, then adds the item anyways because you do not return out of the method. I’m not sure what you mean you only know 3 arguments… any datatype or class can be an argument. ItemList is defined as a list of strings, so you need to add strings to it, so in AddToInventory you need to pass in a string.

What you should be doing is learning the basics of C# so you know a little of what you are doing.