[vet-mm] global and local variables

Wed Sep 5 10:34:03 EST 2007

Thanks Paul!
I'm with you on declaring timeline variables on the first frame, and have never really needed global variables, but thought I had better investigate the area a bit, seeing the "course" expects our students to understand scope and there was a question on it in the 2004 exam.
The way you approach variables as objects is new to me, but it makes a lot of sense,
Marian

________________________________

From: vet-mm-bounces at edulists.com.au on behalf of Paul Sijpkes
Sent: Wed 5/09/2007 9:16 AM
To: VET Multimedia Teachers' Mailing List
Subject: RE: [vet-mm] global and local variables

I know this is an old topic but I thought my input might be useful.

I tend to declare all variables on the first frame in the _root timeline, I don't use the _global option because it is bad programming practice.  

Global variables can easily become confused with locals, especially in bigger programs, it also makes your code less portable so you can't reuse it as easily.

Anyway, this is a huge topic, and I'm sure people will debate this with me, but in my opinion it's the best way to go.

I find the best practice is to create an object for each major part of your code in the _root timeline.

var presentation:Object = new ObjectI(); 

var audience.Object = new Object();

and then declaring the variables relating to that part inside the objects.

presentation.slides = 5;

presentation.boring = true;

audience.sleeping = true;

etc...

You can now reference these objects anywhere in your application using _root.presentation.slides, _root.audience.sleeping etc...

Hope this helps.

Cheers,

Paul Sijpkes
VET Coordinator
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________________________________

From: vet-mm-bounces at edulists.com.au [mailto:vet-mm-bounces at edulists.com.au] On Behalf Of Stoney, Marian Sy
Sent: Wednesday, 22 August 2007 4:35 PM
To: VET Multimedia Teachers' Mailing List
Subject: RE: [vet-mm] global and local variables

Thanks, John. I haven't loaded Flash 8 yet but I'll have to now!  The advice on declaring them on the main timeline is good,

Regards,

Marian

________________________________

From: vet-mm-bounces at edulists.com.au on behalf of Mr John Parlas
Sent: Tue 21/08/2007 3:26 PM
To: VET Multimedia Teachers' Mailing List
Subject: RE: [vet-mm] global and local variables

Hi Marian,

Not sure what you mean but I suspect it has something to do with how the variables are declared. Hopefully the attached file can clear the water a bit. Basically, when variables are declared properly, globals can be used in other parts of the movie where as locals cannot. I tend to always declare globals main timeline - not within a function and just use them within the function.

Look in the frame script to see the code.

Hope this helps????? Flash 8 format.

Regards

John

________________________________

From: vet-mm-bounces at edulists.com.au [mailto:vet-mm-bounces at edulists.com.au] On Behalf Of Stoney, Marian Sy
Sent: Tuesday, 21 August 2007 12:20 PM
To: vet-mm at edulists.com.au
Subject: [vet-mm] global and local variables

Hi there all you Actionscript types!

I'm wondering why, if I declare a global variable on the timeline, it's available to a function on a movie clip, but if I declare a global variable inside a function on a movie clip, it's not available to the timeline, whilst still being available to other functions on other movie clips. I thought global functions were supposed to be available everywhere? I've attached my file, but it's a bit of a mess.

Grateful for any insights!

Thanks,

Marian

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