Array transform.position from another script

hi,my english is not very good so i`ll be directly.i create this code with an array on it to spawn multiples balls in my game,now i`m trying to access this array in a different script,the enemy script,this enemy should move arround depending balls array`s position.here is my spawnBallContoller script:

and here`s the enemyController script:

 #pragma strict
 var speed:float =10;
 var ball:GameObject;
 
 function Update () {
     
    
     if(spawnBallController.ballArray.transform.position.y>transform.position.y){
             transform.position = new Vector3(transform.position.x,transform.position.y+0.2,0);
             transform.position.y = Mathf.Clamp(transform.position.y,-3.4,3.92);
         }
     if(spawnBallController.ballArray.transform.position.y<transform.position.y){
             transform.position = new Vector3(transform.position.x,transform.position.y-0.2,0);
             transform.position.y = Mathf.Clamp(transform.position.y,-3.4,3.92);
         }
    
     
    
     
 }

in unity i got this error: "transform" is not a member of unityengine.gameObject[]; hope someone can understend my problem,thanks