How not to add an object to an array/list if there's already an identical one.

Questions & Answers
1

In my game, you can’t carry two objects of the same type. For example you can’t carry two identical weapons. The code i currently have is this one, which is not working:

    public List <GameObject> objects;

     public void AddObject(GameObject newObject)
    {
        for(int i = 0; i < objects.Count; i++)
        {
            if(objects*.tag == newObject.tag)*

{
Destroy(newObject);
}
else
{
objects.Add(newObject);
}
}

}

4

Check if it contains the object 1st

if(!items.Contains(item))
     items.Add(item);

if the list already contains that object it will not add it. You can also use a dictionary instead of a list, you can not add duplicates to a dictionary.

Sorry that does not check for items of the same type, you would have to compare that.

2

Try this instead:

public List<GameObject> objects;

public void AddObject(GameObject newObject)
{
    bool isNew = true;
    for (int i = 0; i < objects.Count; i++)
    {
        if (objects*.tag == newObject.tag)*

{
isNew = false;
break;
}
}
if (!isNew)
{
Destroy(newObject);
}
else
{
objects.Add(newObject);
}
}
Edit: Sorry missed the ! on the if.

3

public List items = new List();
public void AddObject ( GameObject newObject )
{
for( int i=0 ; i<items.Count ; i++ )
if( items*.tag==newObject.tag )*

  •  	{ Destroy( newObject ); return; }*
  • items.Add( newObject );*
    }
    _
    public Dictionary<string,GameObject> items = new Dictionary<string,GameObject>();
    public void AddObject ( GameObject newObject )
    {
  • if( items.ContainsKey(newObject.tag) ) Destroy( newObject );*
  • else items.Add( newObject.tag , newObject );*
    }