ColdFusion Array Loop Works With ARGUMENTS
Posted December 27, 2007 at 7:38 AM by Ben Nadel
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.
@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.
