I think it's helpful to have all the resources in one place. Indeed, ultimately I'll move this to my "resource lists" page where I keep similar "compendia".

I created the list of VAR scope resources today after helping a client with a problem which seemed related to this classic problem: the need to remember to var scope your variables in CFCs. It's often the cause of subtle bugs. Like many, they still hadn't heard about the problem (or had seen mention of it but didn't really understand it).

So if you're in that place, or know someone who may be, here are resources to help get started on understanding the topic and related issues. As always, the CF community has rallied the troops on the matter, and several folks have blogged in various detail or on various related aspects.

About the resources

The first few elaborate on the problem, and the first one even includes a live running example to demonstrate the point. Then a couple explain some related issues.

I also then list resources on the related new "local" scope in CF 9, and some more that discuss compatibility issues with that.

Note that these may have been written any time in the past couple/few years, so keep that in mind and be sure to check the comments as well.

The resources

First, some general resources introducing the var scoping issue/feature:

• Thread safety and the var scope - live example, by Mike Schierberl
• Why precisely is it important to var-scope your variables?, by Nathan Strutz
• Thread safety example: Var scope your loop index in ColdFusion CFCs!, by Dave Shuck
• Object Oriented Coldfusion : 4 : The var scope, by Adrian Moreno

And some that address various issues related to using the VAR scope:

• Always var scope! Always!! Except..., by Ray Camden
• Var Scoping Queries, by Gary Gilbert
• VAR scoping using structures, by Dave Shuck
• The VAR keyword is idiotic, by Steve Nelson
• The REAL reason you need to var-scope your local CFC function variables, by Tyson Vanek

And some on the change in CF9, for the local scope:

• The New ColdFusion LOCAL Scope, by Ben Forta
• Deciphering the new Local Scope, by Adam Tuttle
• Repeat - ColdFusion 9 does NOT remove the need to var scope!, by Ray Camden

And some tangential discussions of that, including some compatibility issues with the new scope:

• Be careful with the 'local' scope when migrating from CF8 to CF9, by Dan Skaggs
• CHF Warning - Impacts MXUnit, by Ray Camden (important impact of CF 9 CHF 1, even if not using MXUnit)
• LOCAL Variables Scope Conflicts With ColdFusion Query of Queries, by Ben Nadel
• Is this an issue with the local scope in ColdFusion 9?, by Paul Kukiel
• ColdFusion 9 and the local scope continued, by Paul Kukiel
• ColdFusion 9 and the LOCAL Scope, by Joseph Lamoree
• Major Flaw in CF9 - May Break Code! and part 2/part 3, by Sami Hoda

The VarScope tool

Conclusion

Hope those are helpful. Again, it's just a starting list. I welcome additions, and I look forward to your comments. In time, I'll move this (and any suggested additions) to my "resource lists" page. Check that out for similar lists of resources on various subjects.

"HTML Formatter: Easily formats and indents Coldfusion", with Matt Pressnall

Thursday, Feb 25, 12pm US ET (GMT-5)

Meeting description, details, optional RSVP

"FarCry, tailoring your own CMS", with Geoff Bowers

Thursday, Feb 25, 6pm US ET (GMT-5)

Meeting description, details, optional RSVP

Please join us in the meeting room, experts.acrobat.com/cfmeetup, on the day at the time above. Use the "enter as guest" option offering your name (don't try to log in).

Wondering what time this is in your time zone?

Can't access the meetup.com site? You can still join the meeting

The CF Meetup announcements are offered via the commercial third-party hosted site, meetup.com. Since that's been marked by some organizations as a "social networking" site, it may be blocked at your workplace. If you can't see the descriptions (and other details) or use the RSVP mechanism, no worries. There are either of two solutions to get around this.

First, you can just show up on the day at the time above at experts.acrobat.com/cfmeetup. Use the "enter as guest" option and offer your name (as even meetup.com members must do), and you're in. No fuss.

Second, if you'd like to be notified of CF Meetup events and/or see the descriptions, there are a few ways you can (or you can tell others how they can) do these. I discuss them in another blog entry.

All meetings are recorded

All CF Meetup meetings are recorded, and the URLs are posted after the meeting at recordings page and also at my UGTV site. Streaming recordings are available immediately, while downloadable (FLV) recordings will take at least an hour or more to become available.

Wish we had meetings at different times?

The normal time of our meetings is either noon or 6pm US ET, depending on the availability of speakers. To be clear, I would be happy to hold a meetup at another time. If you're in a distant timezone and are willing to speak, I'll be happy to hold a meeting at an hour outside our norm. Speaking of which...

Call for speakers

We're always open to and indeed looking for more speakers. The topics can be new stuff, old stuff, beginner stuff, or advanced stuff. It can be a repeat of something you've given before, or it can be your first presentation ever. In a group with over 1900 members, there's an audience for every topic, and none is ever too small (plus, still more watch the recordings).

If you may be interested in speaking or know someone who is (or you may want to suggest someone you think I should ask), check out speak.coldfusionmeetup.com, which is a past blog entry where I answer common questions, or have them get in touch with me.

While you can find the details (and optional RSVP info) on the meetup event page, I'll repeat the description to save you having to go there:

If you run a production CF server, you've likely hit a situation where the server seems to hang up. Do you know why it's happened? How to troubleshoot it? It may not be CF's fault at all, though it tends to get the blame. In this presentation, I'll point out a few tools (some free, some commercial, some built-in and some third-party) which you ought to know about when the stuff hits the fan. With the right tools and just a little understanding, you can be a CF troubleshooting superhero.

I'll be presenting in the noon (US Eastern Time) slot, this coming Thursday, Feb 18.

Of course, some of the concepts will apply as well to those using Railo, BlueDragon, etc. This is an expansion of an article of the same name that I did in the latest issue of the FusionAuthority Quarterly Update. (BTW, the magazine has converted to an online-only (though still subscription-based) format.)

Happy to help

I'll add also that if you ever find yourself in need of assistance, and have exhausted your review of the many resources on my site and elsewhere (or don't have time), I am available for direct, remote, short-term assistance. More at carehart.org/consulting/. I love helping solve problems and can generally do it very quickly.

That said, the talk is definitely NOT a sales pitch for my services. Like most of my site, the information in the talk is provided freely to those who like to "do it themselves".

"CF911: ColdFusion Tools for When the Stuff Hits the Fan", with Charlie Arehart

Thursday, Feb 18, 12pm US ET (GMT-5)

Meeting description, details, optional RSVP

"FarCry CMS 6.0", with Geoff Bowers

Thursday, Feb 18, 6pm US ET (GMT-5)

Meeting description, details, optional RSVP

Please join us in the meeting room, experts.acrobat.com/cfmeetup, on the day at the time above. Use the "enter as guest" option offering your name (don't try to log in).

Wondering what time this is in your time zone?

Can't access the meetup.com site? You can still join the meeting

The CF Meetup announcements are offered via the commercial third-party hosted site, meetup.com. Since that's been marked by some organizations as a "social networking" site, it may be blocked at your workplace. If you can't see the descriptions (and other details) or use the RSVP mechanism, no worries. There are either of two solutions to get around this.

First, you can just show up on the day at the time above at experts.acrobat.com/cfmeetup. Use the "enter as guest" option and offer your name (as even meetup.com members must do), and you're in. No fuss.

Second, if you'd like to be notified of CF Meetup events and/or see the descriptions, there are a few ways you can (or you can tell others how they can) do these. I discuss them in another blog entry.

All meetings are recorded

All CF Meetup meetings are recorded, and the URLs are posted after the meeting at recordings page and also at my UGTV site.

Wish we had meetings at different times?

I've had some recent complaints from people not liking the time of the meetings, which are either noon or 6pm US ET, depending on the availability of speakers. To be clear, I would be happy to hold a meetup at another time. If you're in a distant timezone and are willing to speak, I'll be happy to hold a meeting at an hour outside our norm. Speaking of which...

Call for speakers

We're always open to and indeed looking for more speakers. The topics can be new stuff, old stuff, beginner stuff, or advanced stuff. It can be a repeat of something you've given before, or it can be your first presentation ever. In a group with over 1900 members, there's an audience for every topic, and none is ever too small (plus, still more watch the recordings).

If you may be interested in speaking or know someone who is (or you may want to suggest someone you think I should ask), check out speak.coldfusionmeetup.com, which is a past blog entry where I answer common questions, or have them get in touch with me.