How to add an inventory to the Player

Hey there, I'm trying to create an inventory for my player. I created this short javascript code and didn't seem to work. Any ideas? I've tried fixing the errors but only leading to more. Please help!

 public class Inventory
 
     List items = new List();
     InventoryItem selectedItem;
     Player owner;
     int currentlySelected = 0;
     public void Init(Player newPlayer)
     {
          newPlayer = owner;
     }
     public bool AddItem(InventoryItem newItem)
     {
          if(owner.strength >= GetTotalMass() + newItem.mass)
          {
               items.Add(newItem);
               return true;
          } else {
              return false;
          }
     }
     public void DropItem(InventoryItem newItem)
     {
         items.Remove(newItem);
     }
     public float GetTotalMass()
     {
          float mass = 0;
          foreach(InventoryItem it in items)
          {
              mass += it.mass;
          }
          return mass;
     }
     public InventoryItem DrawItemsGrid(int columns)
     {
           Texture2D[] textures = GetTextures();
           currentlySelected = GUILayout.SelectionGrid(currentlySelected, textures, columns);
           return items[currentlySelected];
     }
     public Texture2D[] GetTextures()
     {
          List textures = new List();
          foreach(InventoryItem it in items)
          {
              textures.Add(it.icon);
          }
          return textures.ToArray();
     }
 }
 
 public class Player : MonoBehaviour
 {
     public float strength;
     public Inventory invent;
     public Hat myHat;
     public Sword mySword;
     public Sword myOtherSword;
     void Start()
     {
          invent.Init(this);
          invent.Add(myHat);
          invent.Add(mySword);
          invent.Add(myOtherSword);
     }
     public void TipHat()
     {
         //play a hat-tipping animation!
     }
     public void Attack()
     {
         // swing a sword
     }
     void OnGUI()
     {
          InventoryItem currentItem = invent.DrawItemsGrid(2);
          currentItem.DrawGUIInfo();
          if(GUILayout.Button("Activate " + currentItem.itemName))
          {
                currentItem.Activate(this);
          }
          if(GUILayout.Button("Drop " + currentItem.itemName))
          {
                invent.DropItem(currentItem);
          }
     }
 }
 
 public abstract class InventoryItem
 {
     public string itemName;
     public string dragInfo;
     public float mass;
     public Texture2D icon;
     
     public abstract void Activate(Player player);
     public void DrawGUIInfo(){ GUILayout.Label(dragInfo); }
 }
 
 [System.Serializable]
 public class Hat : InventoryItem
 {
     void Activate(Player player)
     {
         player.TipHat();
     }
 }
 
 [System.Serializable]
 public class Sword : InventoryItem
 {
     void Activate(Player player)
     {
         player.Attack();
     }
 }

[Edit by Berenger : formatting. Please next time select your code and hit the 101 010 button.]