[Javascript] How quick is quick ?

Tue Nov 9 11:57:51 CST 2004

Since this topic went off to performance i´d like to show you this small
code:
(based on the description tim gave us...
the first loop takes 1.7 secs on my computer, the 2nd 0.18,
Yet both do the same.
We all use the first kind of loop all of the time but never think about when
to optimize them.

I´ll let you figure out the math behind this one........

<html><head></head>
<script>
var now1
function Performance(description){
	var now2 = new Date()
	var miliSecs=now2.getTime()-now1.getTime()
	alert ( "JavaScript: "+description+"\n"+miliSecs/1000+" seconds. ")
}

now1 = new Date()

var bigString=""
for (var i=0; i<3000;i++){
	var bigString=bigString+ "line "+i+" of 3000"+"\r\n"
}
Performance("Loading BigString")

now1 = new Date()

var bigString2=""
for (var i=0; i<3000;i++){
	var smallstring ="line "+i+" of 3000"+"\r\n"
	bigString2=bigString2+smallstring
}
Performance("Loading smallString")
</script>
<body></body></html>

AnyBody has other tricks to share?

Allard Schripsema
-----Original Message-----
From: javascript-bounces at LaTech.edu
[mailto:javascript-bounces at LaTech.edu]On Behalf Of Laurent Muchacho
Sent: Tuesday, November 09, 2004 3:20 PM
To: '[JavaScript List]'
Subject: RE: [Javascript] How quick is quick ?

Hi

I use this it's pretty simple

put this variable at the beginning of you process or in the first js
var startLoad=new Date();

This one on the onload of the body or at the end of process
var endLoad=new Date();

alert('page loaded in : ' + (endLoad.getTime()-startLoad.getTime()) + '
millisecond');

Regards

Laurent

-----Original Message-----
From: Iztok Polanic [mailto:iztok.polanic at amis.net]
Sent: 09 November 2004 17:06
To: [JavaScript List]
Subject: RE: [Javascript] How quick is quick ?

Hi!

I don't have one, but it shouldn't be so hard to make one. How about getting
time before start and then again at the finish.

Bye,

Iztok (SLO)

> -----Original Message-----
> From: javascript-bounces at LaTech.edu
> [mailto:javascript-bounces at LaTech.edu]On Behalf Of Tim Makins
> Sent: 9. november 2004 17:36
> To: [JavaScript List]
> Subject: [Javascript] How quick is quick ?
>
>
> A few comments recently about how this will take time, and how
> that will be
> really slow.
>
> It would be nice to know exactly - has anyone got a routine that monitors
> the time a javascript routine takes to operate ??
>
> Tim in Ireland.
>
> _______________________________________________
> Javascript mailing list
> Javascript at LaTech.edu
> https://lists.LaTech.edu/mailman/listinfo/javascript

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