CFLib.org – Common Function Library Project

ArrayDefinedAt(arr, pos)

Last updated October 24, 2003

author

Raymond Camden

Version: 2 | Requires: CF6 | Library: DataManipulationLib

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:

/**
 * 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;
	}
}
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