structplusplus

<cfscript>
	data = ['a','b','a'];
	counts = {};
	for (datum in data) {
		if (!structKeyExists(counts, datum)) {
			counts[datum] = 0;
		}
		counts[datum] = counts[datum]++;
	}
	writeDump(counts); // all zeros

	counts = {};
	for (datum in data) {
		if (!structKeyExists(counts, datum)) {
			counts[datum] = 0;
		}
		counts[datum] = counts[datum] + 1;
	}
	writeDump(counts); // correct counts
</cfscript>