Ben Nadel
On User Experience (UX) Design, JavaScript, ColdFusion, Node.js, Life, and Love.
I am the chief technical officer at InVision App, Inc - a prototyping and collaboration platform for designers, built by designers. I also rock out in JavaScript and ColdFusion 24x7.
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Ben Nadel at CFinNC 2009 (Raleigh, North Carolina) with: Matthew Senn and Michael Senn

ColdFusion Array Loop Works With ARGUMENTS

Posted by Ben Nadel
Tags: ColdFusion

As a quick follow up to my post yesterday on using ColdFusion 8's new array iteration via CFLoop, I thought I would check to see if array iteration worked on another "pseudo array", the function ARGUMENTS scope. The ARGUMENTS scope is a very interesting object that has both struct and array properties, meaning, it can be accessed both by key and by index value. As this object only has array-like behavior and is not a true array, it is not clear as to how much array manipulation will be possible. To test this, all I did was set up a function that takes its ARGUMENTS scope and loops over it, CFDumping out each value:

  • <cffunction
  • name="LoopArguments"
  • access="public"
  • returntype="void"
  • output="true"
  • hint="Iterates over the arguments array.">
  •  
  • <!--- Define the local scope. --->
  • <cfset var LOCAL = {} />
  •  
  • <!--- Iterate over the arguments as if it were an array. --->
  • <cfloop
  • index="LOCAL.Value"
  • array="#ARGUMENTS#">
  •  
  • <!--- Dump out data element. --->
  • <cfdump
  • var="[#LOCAL.Value#]"
  • label="ARGUMENTS Data Point"
  • />
  •  
  • </cfloop>
  •  
  • <!--- Return out. --->
  • <cfreturn />
  • </cffunction>

In the CFDump tag, I am including the brackets for visible value deliniation; this means that only string values can be passed to the function, but this should work the same, functionally, with any type of value. Now, we just run the code:

  • <!--- Call function with various values. --->
  • <cfset LoopArguments(
  • "Itty",
  • "Bitty",
  • "Kitty",
  • "Club"
  • ) />

It works perfectly, giving us the CFDump output:

[Itty] [Bitty] [Kitty] [Club]

Cool; ColdFusion 8's new array iteration works fine with the array-like behavior of the ARGUMENTS scope.




Reader Comments

I'd like to see you turn your prodigious investigative powers to what does and does not work with the cfscript loop:

for (i in someVar) { ... }

I know it works for structs (I use it a lot), but what else works with it.

Reply to this Comment

@Sean,

Not a bad idea. I rarely play around with CFScript, so it would be good to do some snooping. I know that you can finally use things like >= and <. Let me see what I can find out.

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