# Variables inside Functions and Performance

**URL:** https://forum.kirupa.com/t/variables-inside-functions-and-performance/301924
**Category:** flash
**Created:** [December 17, 2009, 8:40pm UTC](https://forum.kirupa.com/t/variables-inside-functions-and-performance/301924 "2009-12-17T20:40:00Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![RubenFlash](https://avatars.discourse-cdn.com/v4/letter/r/839c29/32.png) [@RubenFlash](https://forum.kirupa.com/u/RubenFlash)
#### Post date: [December 17, 2009, 8:40pm UTC](https://forum.kirupa.com/t/variables-inside-functions-and-performance/301924/1 "2009-12-17T20:40:00Z")

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So, performance wise, is it necessary to null references to classes, etc inside a function?

Something like:

```auto

 function myFunction():void{
    var myVar:myClass = new myClass();
    //do stuff with myVar...
   
   //don't need myVar anymore
    myVar = null; //is this necessary?
 }
 

```