CFLib.org – ArrayDefinedAt

ArrayDefinedAt(arr, pos)

Last updated October 24, 2003

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author

Raymond Camden
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Version: 2 | Requires: ColdFusion MX | Library: DataManipulationLib

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Description:
Returns true if a specified array position is defined.

Return Values:
Returns a boolean.

Example:

<cfscript>
a = arrayNew(1);
a[1] = "d";
a[2] = "e";
a[4] = "f";
for(i = 1; i lte arrayLen(a); i=i+1) {
if(arrayDefinedAt(a,i)) writeOutput("a#i# is #a[i]#<br>");
else writeOutput("a#i# is undefined<br>");
}
</cfscript>

Parameters:

Name	Description	Required
arr	The array to check.	Yes
pos	The position to check.	Yes

Full UDF Source:

	
	<cfscript>
/**
 * Returns true if a specified array position is defined.
 * 
 * @param arr      The array to check. (Required)
 * @param pos      The position to check. (Required)
 * @return Returns a boolean. 
 * @author Raymond Camden (ray@camdenfamily.com) 
 * @version 2, October 24, 2003 
 */
function arrayDefinedAt(arr,pos) {
    var temp = "";
    try {
        temp = arr[pos];
        return true;
    } 
    catch(coldfusion.runtime.UndefinedElementException ex) {
        return false;
    }
    catch(coldfusion.runtime.CfJspPage$ArrayBoundException ex) {
        return false;
    }
}
</cfscript>