JS objects in Unityscript || BCE0048: Type 'Object' does not support slicing.

 #pragma strict
 
 import System.Collections.Generic;
 
 var speed : float;
 
 var shoot : KeyCode;
 
 private var gunSlot1Transform : Transform;
 private var gunSlot2Transform : Transform;
 
 private var gun1ReloadTime : float;
 private var gun2ReloadTime : float;
 private var lastShotTime : float;
 
 var weapons : Weapons;
 
 private var weapon1ObjectTransform : GameObject;
 private var weapon1FirePoint : Transform;
 private var weapon1Projectile : GameObject;
 
 private var equippedWeapons = new ArrayList();
 
 
 function Start () {
     gun1ReloadTime = weapons.Kanone.reload;
     
     gunSlot1Transform = this.transform.Find("GunSlot1");
     
     equipWeapon(weapons.Kanone);
     
 //    weapon1ObjectTransform = Instantiate(Resources.Load(weapons.Kanone.objectTransformPath, GameObject));
 //    weapon1ObjectTransform.transform.parent = this.transform;
 //    weapon1ObjectTransform.transform.position = gunSlot1Transform.position - weapon1ObjectTransform.transform.Find("ConnectionPoint").position;
 //    weapon1FirePoint = weapon1ObjectTransform.transform.Find("FirePoint");
 //    weapon1Projectile = weapon1ObjectTransform.transform.Find("FireballProjectile").gameObject;
 }
 
 function Update () {
 
     var mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
     transform.rotation = Quaternion.LookRotation(Vector3.forward, mousePos - transform.position);
     
     var move = Vector3(Input.GetAxis("Horizontal"), Input.GetAxis("Vertical"), 0);
     transform.position += move * speed * Time.deltaTime;
     
     if (Input.GetKey (shoot)) {
         for(var i = 0; i < equippedWeapons.Count; i++){
             //if(Time.time - lastShotTime > gun1ReloadTime){
                 //var projectile = Instantiate(weapon1Projectile, weapon1FirePoint.position, this.transform.rotation * Quaternion(0,0,90,-90));
                 //projectile.SetActive(true); 
                 //lastShotTime = Time.time;
                 //DestroyProjectileAfterDelay(projectile);
                 
                 for(var weapon in equippedWeapons){
                     Debug.Log(weapon["weaponGameObject"]);
                 }
             //}
         }
     }
      
     
 }
 
 function DestroyProjectileAfterDelay(Projectile : GameObject, weapon : Weapon) {
     yield WaitForSeconds(weapon.rangeInSec);
     Destroy(Projectile);
  }
  
  function equipWeapon(weapon : Weapon) {
      var equippedWeapon : Dictionary.<String, GameObject> = new Dictionary.<String, GameObject>();
      equippedWeapon["weaponGameObject"] = Instantiate(Resources.Load(weapon.objectTransformPath, GameObject));
     equippedWeapon["weaponGameObject"].transform.parent = this.transform;
     equippedWeapon["weaponGameObject"].transform.position = gunSlot1Transform.position - equippedWeapon["weaponGameObject"].transform.Find("ConnectionPoint").position;
     equippedWeapon["firePoint"] = equippedWeapon["weaponGameObject"].transform.Find("FirePoint").gameObject;
     equippedWeapon["projectile"] = equippedWeapon["weaponGameObject"].transform.Find("FireballProjectile").gameObject;
     equippedWeapons.Add(equippedWeapon);
  }

I get this error: "Assets/scripts/Player.js(56,51): BCE0048: Type 'Object' does not support slicing."

I do understand what the error wants to tell me and I know there were many other guys who had similar issues but this error isn't my main problem.

My problem: I need to store several GameObjects in a List but also need to access them with a key (JS object), but as I heard there is no way to have objects in Unity. I just found Generic Dictionary, but the problem with this type is that I need to have a List (Array) of those Dictionaries and well at this point this error occures! I heard of Classes as Objects aswell but I am not sure how to use them!

Thanks for your help in advance!