Re: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
Hello :)
Yes it's funny .. i forget the 0 is a boolean in a conditional
instruction... the problem with this loop is the negative values. but it's a
good notation.
After tests... in AS2 this method is more speed.
var ar:Array = new Array(50) ;
var time ;
Key.addListener(this) ;
onKeyDown = function()
{
var result ;
var code:Number = Key.getCode() ;
var copy:Array = [].concat(ar)
var len:Number = copy.length ;
switch (code)
{
case Key.UP :
{
time = getTimer() ;
for( var i:Number = 0 ; i -1 )
{
result = copy[len] ;
}
time = getTimer() - time ;
trace( "while(--len > -1) speed : " + time + " ms") ;
break ;
}
case Key.RIGHT :
{
time = getTimer() ;
while( --len -(-1) )
{
result = copy[len] ;
}
time = getTimer() - time ;
trace( "while(--len -(-1)) speed : " + time + " ms") ;
break ;
}
}
}
for speed : 329 ms
while(len--) speed : 305 ms
while(--len > -1) speed : 324 ms
while(--len -(-1)) speed : 418 ms
Thanks :)
EKA+ :)
2007/5/11, Steven Sacks <[EMAIL PROTECTED]>:
I think he was pointing out how the loop could be optimized even further.
Pre-decrementing is faster than post-decrementing.
However, his greater than comparison slows it down. The right way to do
it is:
while (--i -(-1))
{
}
since subtraction is faster than addition.
This is all academic, though. I used to use --i -(-1) but I gave it up
for the readability of while (i--).
This is my new favorite:
while (i--) i++;
;)
___
Flashcoders@chattyfig.figleaf.com
To change your subscription options or search the archive:
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com
http://training.figleaf.com
___
Flashcoders@chattyfig.figleaf.com
To change your subscription options or search the archive:
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com
http://training.figleaf.com
Re: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
I think he was pointing out how the loop could be optimized even further.
Pre-decrementing is faster than post-decrementing.
However, his greater than comparison slows it down. The right way to do
it is:
while (--i -(-1))
{
}
since subtraction is faster than addition.
This is all academic, though. I used to use --i -(-1) but I gave it up
for the readability of while (i--).
This is my new favorite:
while (i--) i++;
;)
___
Flashcoders@chattyfig.figleaf.com
To change your subscription options or search the archive:
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com
http://training.figleaf.com
Re: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
i-- will eventually become 0 which (in AS2) is evaluated to false.
so while(i--) works fine.
regards,
Muzak
- Original Message -
From: "eka" <[EMAIL PROTECTED]>
To:
Sent: Friday, May 11, 2007 6:33 PM
Subject: Re: [Flashcoders] Quick syntax q: how to write a function that
canreceive an undefined number of parameters
> Hello :)
>
> you don't limit your while loop instruction ?
>
> while ( --i > -1)
> {
>
> }
>
> EKA+ :)
>
___
Flashcoders@chattyfig.figleaf.com
To change your subscription options or search the archive:
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com
http://training.figleaf.com
Re: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
Thanks Karina this is the sort of thing I was looking for, as you say
it may be clearer to code this fn the way I initially said but I was
interested in how to code this another way so thanks for helping me.
One tiny typo, before someone else does-
for (var i = 1; i
Thanks again :)
Ben, thanks for your help too, I hadn't thought of only using the
square brackets to make the code more efficient.
Ali
On 11 May 2007, at 15:32, Karina Steffens wrote:
The parameters received by a function are automatically stored in a
built-in
array called "arguments". So you can do something like this:
public static function center(obj1:Object) {
var targetX:Number = ob1._x;
var targetY:Number = ob1._y;
for (var i = 1; ivar targetX:Number = arguments[0]._x; - but there's no reason to do
so in
your code, and this way the method is a bit more clear.
The only caveat is that, depending on the rest of your code, if you
have to
pass an unknown number of movie clips, there's a chance your original
function might actually make more sense...
Cheers,
Karina
-Original Message-
From: Alistair Colling [mailto:[EMAIL PROTECTED]
Sent: 11 May 2007 12:41
To: flashcoders@chattyfig.figleaf.com
Subject: [Flashcoders] Quick syntax q: how to write a
function that canreceive an undefined number of parameters
Hi there, just a quick syntax question, I want to receive a
function that will centre the position of all objects passed
to that of the first object passed but the number of objects
passed may vary. This is the syntax I am currently using, is
this the best way to do it?
Thanks for any comments in advance :)
Ali
//ob1 is the object that the objects in the array centre
themselves to public static function center(ob1:Object,
ob_ar:Array) {
var targetX:Number = ob1._x;
var targetY:Number = ob1._y;
for (var i = 0; ihttp://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com http://training.figleaf.com
___
Flashcoders@chattyfig.figleaf.com
To change your subscription options or search the archive:
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com
http://training.figleaf.com
___
Flashcoders@chattyfig.figleaf.com
To change your subscription options or search the archive:
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com
http://training.figleaf.com
RE: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
The parameters received by a function are automatically stored in a built-in
array called "arguments". So you can do something like this:
public static function center(obj1:Object) {
var targetX:Number = ob1._x;
var targetY:Number = ob1._y;
for (var i = 1; i -Original Message-
> From: Alistair Colling [mailto:[EMAIL PROTECTED]
> Sent: 11 May 2007 12:41
> To: flashcoders@chattyfig.figleaf.com
> Subject: [Flashcoders] Quick syntax q: how to write a
> function that canreceive an undefined number of parameters
>
> Hi there, just a quick syntax question, I want to receive a
> function that will centre the position of all objects passed
> to that of the first object passed but the number of objects
> passed may vary. This is the syntax I am currently using, is
> this the best way to do it?
> Thanks for any comments in advance :)
> Ali
>
> //ob1 is the object that the objects in the array centre
> themselves to public static function center(ob1:Object, ob_ar:Array) {
> var targetX:Number = ob1._x;
> var targetY:Number = ob1._y;
> for (var i = 0; i ob_ar[i]._x = targetX+(ob1._width/2);
> ob_ar[i]._y = targetY+(ob1._width/2);
> }
> }
>
> center(myMC, [myMC2, myMC3, myMC4]);
>
>
>
> ___
> Flashcoders@chattyfig.figleaf.com
> To change your subscription options or search the archive:
> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>
> Brought to you by Fig Leaf Software
> Premier Authorized Adobe Consulting and Training
> http://www.figleaf.com http://training.figleaf.com
>
___
Flashcoders@chattyfig.figleaf.com
To change your subscription options or search the archive:
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com
http://training.figleaf.com
RE: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
I think your code won't center correctly does it? Don't know if []
syntax is slower than creating a local var fisrt, but just in case added
it.
function center(ob1:MovieClip, ob_ar:Array) {
var x:Number = ob1._x - (ob1._width/2);
var y:Number = ob1._y;
for (var i = 0; imailto:[EMAIL PROTECTED] On Behalf Of Alistair
Colling
Sent: vrijdag 11 mei 2007 13:41
To: flashcoders@chattyfig.figleaf.com
Subject: [Flashcoders] Quick syntax q: how to write a function that
canreceive an undefined number of parameters
Hi there, just a quick syntax question, I want to receive a function
that will centre the position of all objects passed to that of the first
object passed but the number of objects passed may vary. This is the
syntax I am currently using, is this the best way to do it?
Thanks for any comments in advance :)
Ali
//ob1 is the object that the objects in the array centre themselves to
public static function center(ob1:Object, ob_ar:Array) {
var targetX:Number = ob1._x;
var targetY:Number = ob1._y;
for (var i = 0; ihttp://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training http://www.figleaf.com
http://training.figleaf.com
This e-mail and any attachment is for authorised use by the intended
recipient(s) only. It may contain proprietary material, confidential
information and/or be subject to legal privilege. It should not be copied,
disclosed to, retained or used by, any other party. If you are not an intended
recipient then please promptly delete this e-mail and any attachment and all
copies and inform the sender. Thank you.
___
Flashcoders@chattyfig.figleaf.com
To change your subscription options or search the archive:
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com
http://training.figleaf.com
