How to make Disappear something in child?

Unity Engine
1 
var child : Transform;

function update(){

// if some occur

instantiate(child, trasform.position, tran...)
}

I want instantiate some child object to our character, repetitively.

So I want that if some event occur, instantiate some object, and then disappear that object.

How?

If I use destroy, it destroys permanent, and can’t be instantiated again.

2

For performance reasons, you’d be better off creating as many instances of the child object you need in a Start() routine, cache them somewhere in your world (or on your player) and then just enable and disable them as you need them. (i.e., myChild.active = true/false)

Especially on iPhone hardware you’ll see a noticeable performance increase over numerous Instantiate and Destroy calls [not to mention avoiding stuttering when the Garbage Collector does it’s thing]