My Secret Life as a Spaghetti Coder
home | about | contact | privacy statement
Today I was writing this simple function to recursively create XML based on a struct, and ran into a minor gotcha:

<cfcomponent>
<cfscript>
   function structToXML(struct)
   {
      var result = "";
      for (item in struct)
      {
         if(not isStruct(struct[item]))
            result = result & "<#item#>#struct[item]#</#item#>";
         else
            result = result & "<#item#>" & structToXML(struct[item]) & "</#item#>";
      }
      return result;
   }
</cfscript>
</cfcomponent>

Can you spot the problem? Its easy to miss: I forgot to var my loop variable, item. I normally remember to put most variables in the var scope, but I often forget to do so when variables are being defined in or by a tag, or in a loop. Things like item, index, and query names. So I spent some time trying to figure out why ColdFusion's stack didn't seem to be working properly: instead of closing the tag with the correct element name, it was closing it with the last used one on recursive calls.

I was about to ask if anyone could help me spot the flaw in my logic when it hit me - the var scope!

Hey! Why don't you make your life easier and subscribe to the full post or short blurb RSS feed? I'm so confident you'll love my smelly pasta plate wisdom that I'm offering a no-strings-attached, lifetime money back guarantee!


Comments
Leave a comment

There are no comments for this entry yet.

Leave a comment

Leave this field empty
Your Name
Email (not displayed, more info?)
Website

Comment:

Subcribe to this comment thread
Remember my details
Google
Web CodeOdor.com

Me
Picture of me

Topics
.NET (19)
AI/Machine Learning (14)
Answers To 100 Interview Questions (10)
Bioinformatics (2)
Business (1)
C and C++ (6)
cfrails (22)
ColdFusion (78)
Customer Relations (15)
Databases (3)
DRY (18)
DSLs (11)
Future Tech (5)
Games (5)
Groovy/Grails (8)
Hardware (1)
IDEs (9)
Java (38)
JavaScript (4)
Linux (2)
Lisp (1)
Mac OS (4)
Management (15)
MediaServerX (1)
Miscellany (76)
OOAD (37)
Productivity (11)
Programming (168)
Programming Quotables (9)
Rails (31)
Ruby (67)
Save Your Job (58)
scriptaGulous (4)
Software Development Process (23)
TDD (41)
TDDing xorblog (6)
Tools (5)
Web Development (8)
Windows (1)
With (1)
YAGNI (10)

Resources
Agile Manifesto & Principles
Principles Of OOD
ColdFusion
CFUnit
Ruby
Ruby on Rails
JUnit



RSS 2.0: Full Post | Short Blurb
Subscribe by email:

Delivered by FeedBurner