RE: [Flashcoders] Try... catch......

2009-05-10 Thread Mario Gonzalez 
One thing to note, is that try,catch(e:Error) is expensive for the AVM because 
it has to Throw an error.

Maybe not for this example or whatever you're creating, but it's something to 
keep in mind for later.
I see a lot of code we receive riddled with that as a way of hiding run-time 
errors AVM1 style.

Just something to note,

Mario Gonzalez
http://onedayitwillmake.com/
http://wonderfl.kayac.com/user/onedayitwillmake/


From: flashcoders-boun...@chattyfig.figleaf.com 
[flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Paul Andrews 
[p...@ipauland.com]
Sent: Saturday, May 09, 2009 11:27 AM
To: Flash Coders List
Subject: Re: [Flashcoders] Try... catch..

I regret my one word answer because while it answers the question, there's a
question of good practice to consider.

Putting return ball; as  the last line doesn't really help the casual code
reader, because I need to really look hard at the code to realise that if
ball is not explicitly set elsewhere the return value will be null.

However,

catch (e:TypeError ){ return null; }

explicitly shows that if the exception occurs the function will return null.

There's even a good argument for having return null at the end of the code
too, since only one exception will explicitly return null...

It's always better to have explicit code rather than try and save a
statement or two. We've all been down the smart code route though. Guilty
as charged.

Paul





- Original Message -
From: Paul Andrews p...@ipauland.com
To: Flash Coders List flashcoders@chattyfig.figleaf.com
Sent: Saturday, May 09, 2009 4:17 PM
Subject: Re: [Flashcoders] Try... catch..


 Yes.

 - Original Message -
 From: ACE Flash acefl...@gmail.com
 To: Flash Coders List flashcoders@chattyfig.figleaf.com
 Sent: Saturday, May 09, 2009 3:28 PM
 Subject: Re: [Flashcoders] Try... catch..


 Hi Hans,

 Thanks for the code :) I have one more question for the script below

 1. if catch the TypeError, does the last line = return ball will
 execute?

 Thanks a lot


 public function myBall( value:int ):Ball
  {
   var ball:Ball = null;

  try{

 //my code goes here.
  } catch (e:TypeError ){

  }
  return ball;
 }



 On Sat, May 9, 2009 at 2:21 AM, Hans Wichman
 j.c.wich...@objectpainters.com
 wrote:

 Hi,
 yup

 either
 public function myBall( value:int ):Ball
   {
   var ball:Ball

   try{

  //my code goes here.
  return ball;
  } catch (e:TypeError ){
   trace(Whoops);
   }
   return null;
   }

 or

 public function myBall( value:int ):Ball
   {
var ball:Ball = null;

   try{

  //my code goes here.
   } catch (e:TypeError ){

   }
   return ball;
  }
 There are more possibilities, some of which are better practice than
 others,
 but in such a small method, I wouldn't make to much of a fuss about it.

 regards,
 JC


 On Sat, May 9, 2009 at 3:22 AM, ACE Flash acefl...@gmail.com wrote:

  Hi there,
 
  I am trying to add try block in my code, how can I deal it with return
  function?
 
  If the code without any problems, I'd like to return ball ,
  otherwise
 I'd
  like to EXIT or return null.
 
  Thanks
 
  -
 
   public function myBall( value:int ):Ball
 {
 var ball:Ball
 
 try{
 
//my code goes here.
return ball;
} catch (e:TypeError ){
 
 }
 
// shall I add = return null here?
 }
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Re: [Flashcoders] Try... catch......

2009-05-10 Thread Juan Pablo Califano 
I might be wrong, but I think hanlding an exception / error is not the
expensive part.

The expensive part is throwing, as you said.

But, if you have:

var container:Sprite = null;
container.addChild(child);

The error will be thrown, whether you have a handler for it or not. The
cost here is that the player has to unwind the stack looking for a
suitable catch block to handle the error, jump to that block and then get
back to where it was.

In fact, I think handling the error right away should be less expensive than
not catching it or catching it further down the stack.

Cheers
Juan Pablo Califano


2009/5/10 Mario Gonzalez ma...@wddg.com

 One thing to note, is that try,catch(e:Error) is expensive for the AVM
 because it has to Throw an error.

 Maybe not for this example or whatever you're creating, but it's something
 to keep in mind for later.
 I see a lot of code we receive riddled with that as a way of hiding
 run-time errors AVM1 style.

 Just something to note,

 Mario Gonzalez
 http://onedayitwillmake.com/
 http://wonderfl.kayac.com/user/onedayitwillmake/

 
 From: flashcoders-boun...@chattyfig.figleaf.com [
 flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Paul Andrews [
 p...@ipauland.com]
 Sent: Saturday, May 09, 2009 11:27 AM
 To: Flash Coders List
  Subject: Re: [Flashcoders] Try... catch..

 I regret my one word answer because while it answers the question, there's
 a
 question of good practice to consider.

 Putting return ball; as  the last line doesn't really help the casual
 code
 reader, because I need to really look hard at the code to realise that if
 ball is not explicitly set elsewhere the return value will be null.

 However,

 catch (e:TypeError ){ return null; }

 explicitly shows that if the exception occurs the function will return
 null.

 There's even a good argument for having return null at the end of the
 code
 too, since only one exception will explicitly return null...

 It's always better to have explicit code rather than try and save a
 statement or two. We've all been down the smart code route though. Guilty
 as charged.

 Paul





 - Original Message -
 From: Paul Andrews p...@ipauland.com
 To: Flash Coders List flashcoders@chattyfig.figleaf.com
 Sent: Saturday, May 09, 2009 4:17 PM
 Subject: Re: [Flashcoders] Try... catch..


  Yes.
 
  - Original Message -
  From: ACE Flash acefl...@gmail.com
  To: Flash Coders List flashcoders@chattyfig.figleaf.com
  Sent: Saturday, May 09, 2009 3:28 PM
  Subject: Re: [Flashcoders] Try... catch..
 
 
  Hi Hans,
 
  Thanks for the code :) I have one more question for the script below
 
  1. if catch the TypeError, does the last line = return ball will
  execute?
 
  Thanks a lot
 
 
  public function myBall( value:int ):Ball
   {
var ball:Ball = null;
 
   try{
 
  //my code goes here.
   } catch (e:TypeError ){
 
   }
   return ball;
  }
 
 
 
  On Sat, May 9, 2009 at 2:21 AM, Hans Wichman
  j.c.wich...@objectpainters.com
  wrote:
 
  Hi,
  yup
 
  either
  public function myBall( value:int ):Ball
{
var ball:Ball
 
try{
 
   //my code goes here.
   return ball;
   } catch (e:TypeError ){
trace(Whoops);
}
return null;
}
 
  or
 
  public function myBall( value:int ):Ball
{
 var ball:Ball = null;
 
try{
 
   //my code goes here.
} catch (e:TypeError ){
 
}
return ball;
   }
  There are more possibilities, some of which are better practice than
  others,
  but in such a small method, I wouldn't make to much of a fuss about it.
 
  regards,
  JC
 
 
  On Sat, May 9, 2009 at 3:22 AM, ACE Flash acefl...@gmail.com wrote:
 
   Hi there,
  
   I am trying to add try block in my code, how can I deal it with
 return
   function?
  
   If the code without any problems, I'd like to return ball ,
   otherwise
  I'd
   like to EXIT or return null.
  
   Thanks
  
   -
  
public function myBall( value:int ):Ball
  {
  var ball:Ball
  
  try{
  
 //my code goes here.
 return ball;
 } catch (e:TypeError ){
  
  }
  
 // shall I add = return null here?
  }
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Re: [Flashcoders] Try... catch......

2009-05-09 Thread Hans Wichman 
Hi,
yup

either
public function myBall( value:int ):Ball
   {
   var ball:Ball

   try{

  //my code goes here.
  return ball;
  } catch (e:TypeError ){
  trace(Whoops);
   }
   return null;
   }

or

public function myBall( value:int ):Ball
   {
   var ball:Ball = null;

   try{

  //my code goes here.
  } catch (e:TypeError ){

   }
   return ball;
 }
There are more possibilities, some of which are better practice than others,
but in such a small method, I wouldn't make to much of a fuss about it.

regards,
JC


On Sat, May 9, 2009 at 3:22 AM, ACE Flash acefl...@gmail.com wrote:

 Hi there,

 I am trying to add try block in my code, how can I deal it with return
 function?

 If the code without any problems, I'd like to return ball , otherwise I'd
 like to EXIT or return null.

 Thanks

 -

  public function myBall( value:int ):Ball
{
var ball:Ball

try{

   //my code goes here.
   return ball;
   } catch (e:TypeError ){

}

   // shall I add = return null here?
}
 ___
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 Flashcoders@chattyfig.figleaf.com
 http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

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Re: [Flashcoders] Try... catch......

2009-05-09 Thread ACE Flash 
Hi Hans,

Thanks for the code :) I have one more question for the script below

1. if catch the TypeError, does the last line = return ball will execute?

Thanks a lot


public function myBall( value:int ):Ball
  {
   var ball:Ball = null;

  try{

 //my code goes here.
  } catch (e:TypeError ){

  }
  return ball;
 }



On Sat, May 9, 2009 at 2:21 AM, Hans Wichman j.c.wich...@objectpainters.com
 wrote:

 Hi,
 yup

 either
 public function myBall( value:int ):Ball
   {
   var ball:Ball

   try{

  //my code goes here.
  return ball;
  } catch (e:TypeError ){
   trace(Whoops);
   }
   return null;
   }

 or

 public function myBall( value:int ):Ball
   {
var ball:Ball = null;

   try{

  //my code goes here.
   } catch (e:TypeError ){

   }
   return ball;
  }
 There are more possibilities, some of which are better practice than
 others,
 but in such a small method, I wouldn't make to much of a fuss about it.

 regards,
 JC


 On Sat, May 9, 2009 at 3:22 AM, ACE Flash acefl...@gmail.com wrote:

  Hi there,
 
  I am trying to add try block in my code, how can I deal it with return
  function?
 
  If the code without any problems, I'd like to return ball , otherwise
 I'd
  like to EXIT or return null.
 
  Thanks
 
  -
 
   public function myBall( value:int ):Ball
 {
 var ball:Ball
 
 try{
 
//my code goes here.
return ball;
} catch (e:TypeError ){
 
 }
 
// shall I add = return null here?
 }
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  http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
 
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Re: [Flashcoders] Try... catch......

2009-05-09 Thread Paul Andrews 

Yes.

- Original Message - 
From: ACE Flash acefl...@gmail.com

To: Flash Coders List flashcoders@chattyfig.figleaf.com
Sent: Saturday, May 09, 2009 3:28 PM
Subject: Re: [Flashcoders] Try... catch..



Hi Hans,

Thanks for the code :) I have one more question for the script below

1. if catch the TypeError, does the last line = return ball will execute?

Thanks a lot


public function myBall( value:int ):Ball
 {
  var ball:Ball = null;

 try{

//my code goes here.
 } catch (e:TypeError ){

 }
 return ball;
}



On Sat, May 9, 2009 at 2:21 AM, Hans Wichman 
j.c.wich...@objectpainters.com

wrote:



Hi,
yup

either
public function myBall( value:int ):Ball
  {
  var ball:Ball

  try{

 //my code goes here.
 return ball;
 } catch (e:TypeError ){
  trace(Whoops);
  }
  return null;
  }

or

public function myBall( value:int ):Ball
  {
   var ball:Ball = null;

  try{

 //my code goes here.
  } catch (e:TypeError ){

  }
  return ball;
 }
There are more possibilities, some of which are better practice than
others,
but in such a small method, I wouldn't make to much of a fuss about it.

regards,
JC


On Sat, May 9, 2009 at 3:22 AM, ACE Flash acefl...@gmail.com wrote:

 Hi there,

 I am trying to add try block in my code, how can I deal it with return
 function?

 If the code without any problems, I'd like to return ball , otherwise
I'd
 like to EXIT or return null.

 Thanks

 -

  public function myBall( value:int ):Ball
{
var ball:Ball

try{

   //my code goes here.
   return ball;
   } catch (e:TypeError ){

}

   // shall I add = return null here?
}
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 Flashcoders@chattyfig.figleaf.com
 http://chattyfig.figleaf.com/mailman/listinfo/flashcoders

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Re: [Flashcoders] Try... catch......

2009-05-09 Thread Paul Andrews 
I regret my one word answer because while it answers the question, there's a 
question of good practice to consider.


Putting return ball; as  the last line doesn't really help the casual code 
reader, because I need to really look hard at the code to realise that if 
ball is not explicitly set elsewhere the return value will be null.


However,

catch (e:TypeError ){ return null; }

explicitly shows that if the exception occurs the function will return null.

There's even a good argument for having return null at the end of the code 
too, since only one exception will explicitly return null...


It's always better to have explicit code rather than try and save a 
statement or two. We've all been down the smart code route though. Guilty 
as charged.


Paul





- Original Message - 
From: Paul Andrews p...@ipauland.com

To: Flash Coders List flashcoders@chattyfig.figleaf.com
Sent: Saturday, May 09, 2009 4:17 PM
Subject: Re: [Flashcoders] Try... catch..



Yes.

- Original Message - 
From: ACE Flash acefl...@gmail.com

To: Flash Coders List flashcoders@chattyfig.figleaf.com
Sent: Saturday, May 09, 2009 3:28 PM
Subject: Re: [Flashcoders] Try... catch..



Hi Hans,

Thanks for the code :) I have one more question for the script below

1. if catch the TypeError, does the last line = return ball will 
execute?


Thanks a lot


public function myBall( value:int ):Ball
 {
  var ball:Ball = null;

 try{

//my code goes here.
 } catch (e:TypeError ){

 }
 return ball;
}



On Sat, May 9, 2009 at 2:21 AM, Hans Wichman 
j.c.wich...@objectpainters.com

wrote:



Hi,
yup

either
public function myBall( value:int ):Ball
  {
  var ball:Ball

  try{

 //my code goes here.
 return ball;
 } catch (e:TypeError ){
  trace(Whoops);
  }
  return null;
  }

or

public function myBall( value:int ):Ball
  {
   var ball:Ball = null;

  try{

 //my code goes here.
  } catch (e:TypeError ){

  }
  return ball;
 }
There are more possibilities, some of which are better practice than
others,
but in such a small method, I wouldn't make to much of a fuss about it.

regards,
JC


On Sat, May 9, 2009 at 3:22 AM, ACE Flash acefl...@gmail.com wrote:

 Hi there,

 I am trying to add try block in my code, how can I deal it with return
 function?

 If the code without any problems, I'd like to return ball , 
 otherwise

I'd
 like to EXIT or return null.

 Thanks

 -

  public function myBall( value:int ):Ball
{
var ball:Ball

try{

   //my code goes here.
   return ball;
   } catch (e:TypeError ){

}

   // shall I add = return null here?
}
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[Flashcoders] Try... catch......

2009-05-08 Thread ACE Flash 
Hi there,

I am trying to add try block in my code, how can I deal it with return
function?

If the code without any problems, I'd like to return ball , otherwise I'd
like to EXIT or return null.

Thanks

-

  public function myBall( value:int ):Ball
{
var ball:Ball

try{

   //my code goes here.
   return ball;
   } catch (e:TypeError ){

}

   // shall I add = return null here?
}
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Re: [Flashcoders] try-catch-finally ...

2009-03-04 Thread Weyert de Boer 
Sure. Reasonable good practice to catch exceptions. I normally use it 
for things like catch the exception and try it once again and if it 
fails for the second time. I will show an error message or try secondary 
option.

Technically, it's good practice/professional to use try-catch-finally blocks
in your actionscript logic. This ensures a robust, easily debugg-able
application.

However, can anyone comment if they actually use try-catch-finally or
whether anyone is for or against it's use.

I ask because I've received an application (which streams vidoe) that was
blowing out numerous users CPUs to 100%. Upon further investigation, it
appears that a netstream event is firing 20 times a second, and within the
listener (listener function that is) for the event, there is a
try-catch-finally block. I removed the try-catch-finally and CPU usage
halved on my machine.
Anyone care to comment for or against try-catch-finally and it's use.

Steve.
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[Flashcoders] try-catch-finally ...

2009-03-03 Thread SJF 
Technically, it's good practice/professional to use try-catch-finally blocks
in your actionscript logic. This ensures a robust, easily debugg-able
application.

However, can anyone comment if they actually use try-catch-finally or
whether anyone is for or against it's use.

I ask because I've received an application (which streams vidoe) that was
blowing out numerous users CPUs to 100%. Upon further investigation, it
appears that a netstream event is firing 20 times a second, and within the
listener (listener function that is) for the event, there is a
try-catch-finally block. I removed the try-catch-finally and CPU usage
halved on my machine.
Anyone care to comment for or against try-catch-finally and it's use.

Steve.
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