CFLib.org – Common Function Library Project

Description:
This function compares 2 one-demensional arrays (a & b) with simple values and returns an array with the values found in one array (a) but not in the other (b).

Return Values:
Returns an array.

Example:

<cfscript>
aSmaller = arrayNew(1);
aSmaller[1] = 'a';
aSmaller[2] = 'b';
aBigger = arrayNew(1); 
aBigger[1] = 'a';
aBigger[2] = 'c';
aBigger[3] = 'b';
aBigger[4] = 'd';
</cfscript>

Smaller Array:
<cfdump var="#aSmaller#"><br />
Bigger Array:
<cfdump var="#aBigger#"><br />
Difference between the two:
<cfset aDifferences = arrayDiff(aSmaller,aBigger)>
<Ccfdump var="#aDifferences#">

Parameters:

Full UDF Source:

<cfscript>
/**
 * Compares two arrays (with simple values) and returns the difference between the two.
 * 
 * @param smallerArray 	 First array. (Required)
 * @param biggerArray 	 Second array. (Required)
 * @return Returns an array. 
 * @author Greg Nettles (&#103;&#114;&#101;&#103;&#110;&#101;&#116;&#116;&#108;&#101;&#115;&#64;&#103;&#109;&#97;&#105;&#108;&#46;&#99;&#111;&#109;) 
 * @version 1, March 13, 2007 
 */
function arrayDiff(smallerArray,biggerArray) {
	var i = "";
	var result = arrayNew(1);
	var s = arrayToList(arguments.smallerArray);
	for (i=1;i lte arrayLen(arguments.biggerArray); i=i+1) if (listFind(s, arguments.biggerArray[i]) is 0) arrayAppend(result, arguments.biggerArray[i]);
	return result;
}
</cfscript>