How to find Variable type in as3

Object,Array,Number,String,MovieClip,Sprite there are basic variable type in as3.

var a1:Object=new Object();

var a2:Array=new Array();

var a3:Number=new Number();

var a4:String=new String();

var a5:MovieClip=new MovieClip();

var a6:Sprite=new Sprite();

var container:Array=new Array(a1,a2,a3,a4,a5,a6);

here which variable is a Object from container array?

for(var i:int=0;i<container.length;i++)

{

    if(typeof(container[i])=="object")

    trace("this one is object type variable: "+container[i]);

}

...CHeeRS...