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ArrayIsDefined
DescriptionDetermines
whether an array element is defined.
ReturnsTrue,
if the array element is defined (exists); false, otherwise.
Function syntaxArrayIsDefined(array, elementIndex)
HistoryColdFusion
8: Added this function.
Parameters
Parameter
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Description
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array
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Name of a one-dimensional array, or the
array name and indexes into higher-order dimensions of a multidimensional array.
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elementIndex
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Index of the element in a one-dimensional
array, or the index of the element in the final dimension of a multidimensional array.
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UsageThe index
value of an element must be less than the length of the array.
To
test the existence of an element in a multidimensional array, specify
all but the last dimension of the array in the first parameter.
For example, the following line tests the existence of element MyArray[2][4][1]:
ArrayIsDefined(MyArray[2][4], 1)
Example<h3>ArrayIsDefined Example</h3>
<!--- Create a sparse new array. --->
<cfset MyArray = ArrayNew(1)>
<!--- Populate an element or two. --->
<cfset MyArray[1] = "Test">
<cfset MyArray[3] = "Other Test">
<cfoutput>
<!--- Display the contents of the array. --->
<p>Your array contents are:
<cfdump var="#MyArray#"></p>
<!--- Check if an existing element is defined. --->
<p>Does element 3 exist?:
#ArrayIsDefined(MyArray, 3)#</p>
<!--- Check if a non-existent element is defined. --->
<p>Does element 2 exist?
#ArrayIsDefined(MyArray, 2)#
</cfoutput>
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