Terraria.Player.FindItem C# (CSharp) Method

        public int FindItem(bool[] validtypes)
        {
            for (int index = 0; index < 58; ++index)
            {
                if (this.inventory[index].stack > 0 && validtypes[this.inventory[index].itemId])
                    return index;
            }
            return -1;
        }