function DestroyAllObjectsWithTag(tag : String) {

       var scan : GameObject;
       for(scan in GameObject.FindGameObjectsWithTag(tag)) {
             GameObject.Destroy(scan);
       }

  }

Got error. It said, "not compatible with the argument list '()'."

for js it would like this

var objectTag = gameObject.FindGameObjectsWithTag("the objects tag");
for(var i : int = 0; i <objectTag.length; i++){
Destroy(objectTag[i]);

}

let me explain when accessing objects inside a tag you must create a way for it to cycle through each object, if you just state destory gameobjectwith tag then it will destroy only one, but add a simple loop then it will effect each of them.

if say you only want to delete say five of ten objects then just replace length witth a number

you could use this with other things as well for example heres a snippet from my code

var RagDollTag = gameObject.FindGameObjectsWithTag("RagDoll");
    for(var RDT : int = 0; RDT <RagDollTag.length; RDT++){
       RagDollTag[RDT].GetComponent(Rigidbody).isKinematic = false;
         RagDollTag[RDT].GetComponent(Collider).isTrigger = false;
    }