Part III The ColdFusion MX Language in Java

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Part III The ColdFusion MX Language
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Whenever you pass arguments to a function, ColdFusion creates an object named Arguments that contains this collection of arguments. We say collection rather than structure or array because Arguments is different from any other ColdFusion object: It can behave as either a structure or an array under certain circumstances. If your arguments are named in either the declaration of the function or as the function is called, a structure named Arguments that contains keys named for those arguments is created, and you can CFDUMP this structure to inspect it. Calling the preceding snippet, for example, creates an Arguments structure containing two keys named arg1 and arg2, and their values are equal to those passed for each argument. Suppose, however, that you don t name your arguments in the declaration of the function or as it is called, as is the case with the following example:
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<cffunction name= UseUnnamedArgs returntype= numeric > <cfset var result = ArrayLen(Arguments)> <cfreturn result> </cffunction> <cfoutput>#UseUnnamedArgs(5,11)#</cfoutput>
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In this case, ColdFusion creates an Arguments object that cannot be inspected with CFDUMP (and you can t even loop over it using a Collection loop) but can be used the same as an array. So you can reference the individual arguments as Arguments[1], Arguments[2], and so on, and you can also use ArraySum(Arguments), ArrayMin(Arguments), and so on. Following is an example of when you d use Arguments as an array:
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<cfscript> function SumUnnamedArgs() { return ArraySum(Arguments); } </cfscript> <cfoutput> #SumUnnamedArgs(1,6,4,22,8,5,3)# #SumUnnamedArgs(8,3,4,2)# </cfoutput>
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Because you don t know how many arguments are passed in to the function, you can just use the Arguments array to use all of them without names.
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In the preceding sections, you ve called functions only by using a syntax such as SumArgs(8,3,4,2). You can, however, also call functions by using two CFML tags: CFINVOKE and CFINVOKEARGUMENT. The following code, for example, is a function that we used in the section Defining function arguments, earlier in the chapter:
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<cfscript> function add2(firstNumber, secondNumber) { return firstNumber + secondNumber; } </cfscript>
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17 Building User-Defined Functions
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Following is how we would call that function by using the standard syntax:
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If we call that function by using CFINVOKE, it looks as follows:
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<cfinvoke method= add2 returnvariable= theSum > <cfinvokeargument name= firstNumber value= 7 > <cfinvokeargument name= secondNumber value= 3 > </cfinvoke> <cfoutput>#theSum#</cfoutput>
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Notice that, in using CFINVOKE, we specify the name of the variable in the calling template into which the result of the function is returned. This is necessary because we are not simply outputting an inline function call: Some container must be there for the result that is external to the tag-based function invocation code.
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CFINVOKEARGUMENT also enables you to conditionally include or modify arguments, because it is a tag-based construction, as the following example shows: <cfinvoke method= add2 returnvariable= theSum > <cfinvokeargument name= firstNumber value= 7 > <cfif secNum GT 100> <cfinvokeargument name= secondNumber value= 100 > <cfelse> <cfinvokeargument name= secondNumber value= #secNum# > </cfif> </cfinvoke> <cfoutput>#theSum#</cfoutput>
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Note that when using CFINVOKEARGUMENT, you must always provide a name for every parameter, so you can t use positional notation with CFINVOKEARGUMENT. You have another option for calling a function by using CFINVOKE. You can put the function s arguments into a structure named argumentcollection and pass the structure to CFINVOKE, as follows:
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<cfset myStruct = StructNew()> <cfset myStruct[ firstNumber ] = 7> <cfset myStruct[ secondNumber ] = 3> <cfinvoke method= SumArgs returnvariable= theSum argumentcollection= #myStruct# >
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All the keys in myStruct become the arguments to the SumArgs() function; in essence, myStruct becomes the function s Arguments collection. The advantage to this method is that you can assemble the arguments into the structure well before the function is called and then just pass the single structure to the function. The disadvantage is that you must always use named notation; you can have no unnamed arguments. You have yet another option for calling CFINVOKE. The arguments to the function can be passed as extra attributes to CFINVOKE, as follows:
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