Comments on: Practical Performance Tweaks

By: Jonathan Campos

Jonathan Campos — Fri, 12 Feb 2010 16:52:19 +0000

I agree that you receive Null. I did make sure to include that warning when using “as”. But I left it in there so I didn’t get people saying I forgot NumberAsString as one of the permutations. One of those situations where you’re damned if you do, damned if you don’t.

By: georgi

georgi — Fri, 12 Feb 2010 14:16:03 +0000

The NumberAsString is wrong — it should be excluded from the tests.
That’s because:
41.5 as String is clearly null and not “41.5″.

‘as’ does not convert. It just checks the RTTI and returns non-null only if the object is an instance of the class argument.

By: Most Tweeted Articles by Flash Experts

Most Tweeted Articles by Flash Experts — Sat, 26 Dec 2009 12:26:50 +0000

[...] 2010 (25/03/2010) 4 Likes Adobe: Flex 4 beta in a Week 4 Likes Practical Performance Tweaks | The World In A State of Flex I've had a little bit of time on my hands in my day job *cough choke laugh* and thought I would [...]

By: Jonathan Campos

Jonathan Campos — Wed, 02 Dec 2009 15:12:48 +0000

@sascha That was my guess too. Making the additional reference to a static function seemed more like another hoop to jump through rather than a point of improvement.

By: Jonathan Campos

Jonathan Campos — Wed, 02 Dec 2009 15:11:15 +0000

@Germain It wasn’t that I found these stats. I created these tests to run because I wanted to see not what people said / assumed was faster, but instead what actually was faster. You can view source and see the tests and run them for yourself. I will be releasing another set of tests at some point as performance testing has been interesting and fun.

By: sascha/hdrs

sascha/hdrs — Wed, 02 Dec 2009 14:53:48 +0000

Nevermind. After some quick tests it turns out that calling Math functions directly is much faster than storing them in a var or even const.

By: sascha/hdrs

sascha/hdrs — Wed, 02 Dec 2009 13:39:56 +0000

Some very interesting results here, thanks for the tests! According to this site http://wiki.joa-ebert.com/index.php/Casting wrapped cast is faster than cast with ‘as’.

One case that would still interest me is if a Math function stored in a class property is faster than using it direclty. E.g.

private var _mathRandom:Function = Math.random;
…
somewhere down the line:
var n:Numer = _mathRandom();

instead of:
var n:Numer = Math.random();

By: Germain LECOURTOIS

Germain LECOURTOIS — Wed, 02 Dec 2009 13:19:13 +0000

Function.apply … I’m not the first who is surprised…
How did you find this tips ?

Thanks for this benchmark !

By: Twitted by nothingagency

Twitted by nothingagency — Wed, 02 Dec 2009 12:42:38 +0000

[...] This post was Twitted by nothingagency [...]

By: Jonathan Campos

Jonathan Campos — Tue, 01 Dec 2009 12:39:04 +0000

@krdr That would be interesting tests. Finding in first position and finding in last position. You will notice from my tests that I put the if..then and switch..case statements in the same order and randomized the order that the true result would be found so that it would equalize the found first, second, or last. But that would be an interesting set of tests to add, just to see the results.