Removing objects from GameObject array

I have a GameObject array. I'm trying to remove objects from it based on trigger. But the compiler recognises it as a GameObject and not an array. How do I convert the GameObject into an array? Here's the code:

 var tileArray : GameObject[];
 
 var speed : float = 5;
 var x : float;
 var z : float;
 
 var tile : GameObject;
 
 function Update () {
     x = Input.GetAxis("Horizontal") * speed * Time.deltaTime; 
      z = Input.GetAxis("Vertical") * speed * Time.deltaTime; 
      transform.Translate(x, 0, z); 
     //Debug.Log("Position is " + transform.position.x + " " + transform.position.y + " "+ transform.position.z);
 }
 
 function OnTriggerEnter (other : Collider) {
         //Debug.Log("Triggered! " + other.gameObject.transform.position);
         tileArray += [other.gameObject];
 }
 
 function OnTriggerExit (other : Collider) {    
 
     for (var i = 0; i < tileArray.length; i++)
     {
         if (tileArray[i] == other)
             tileArray.RemoveAt(i); // Problem part
     }    
 }

It throws me the following error:

 Assets/Scripts/CharacterMove.js(33,35): BCE0019: 'RemoveAt' is not a member of 'UnityEngine.GameObject[]'. 

Thanks in advance.