O(n) implementation of arrayMerge -- returns an array of the two input arrays combined and de-duped

gistfile1.cfm

<cffunction name="arrayMerge">
	<cfargument name="a" />
	<cfargument name="b" />
	<cfset var i = 0 />
	<cfset var base = StructNew() />
	<cfloop list="#arrayToList(a)#" index="i">
		<cfset base[i] = "" />
	</cfloop>
	<cfloop from="1" to="#arrayLen(b)#" index="i">
		<cfset base[b[i]] = "" />
	</cfloop>
	<cfreturn listToArray(structKeyList(base)) />
</cffunction>

<cfset result = arrayMerge( ['a','b','c','d'], ['a','c','z','x'] ) />

<!---
	Returns (order not guaranteed): ['a','b','c','d','z','x']
--->