arrayDistinct.cfm

<cfscript>
	function arrayDistinct (required array data) {
		var output = arrayNew(1);
		output.addAll(createObject("java", "java.util.HashSet").init(arguments.data));
		return output;
	}

	data = [1,2,3,4,5,4,3,2,1];
	result = arrayDistinct(data);

	assertTrue(isArray(result), "returns an array");
	assertTrue(arrayLen(result) == 5, "removes duplicates");
	arraySort(result, "numeric"); //you can use it like a CFML array
	assertTrue(arrayToList(result) == "1,2,3,4,5", "returns expected data");


//utility function

	function assertTrue (required boolean condition, string message = "") {
		if (!condition) {
			writeoutput('<pre style="font-weight:bold; color:red;">Fail! #message#</pre>');
		} else {
			writeoutput('<pre style="color:green;">Pass: #message#</pre>');
		}
	}


</cfscript>