Adding JavaScript Map/Reduce jobs

javascriptMapReduce/countAndAverageDelayedFlights.js

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+var map = function (key, value, context){
+	var flightData = value.split(/,/);
+	var destAirport = flightData[4];
+	var arrivalDelay = flightData[0];
+	context.write(destAirport, arrivalDelay);
+};
+
+var reduce = function (key, values, context) {
+	var flightCount = 0;
+	var delaySum = 0;
+	while (values.hasNext()) {
+		flightCount++;
+		delaySum += parseInt(values.next());
+	}
+	context.write(key, flightCount + "\t" + (delaySum*1.0)/(flightCount*1.0));	
+};

javascriptMapReduce/readme.md

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+Using JavaScript for MapReduce Jobs
+============================
+This shows a way to write MapReduce jobs using a JavaScript API
+
+Setup
+============================
+Within the JavaScirpt console
+
+	#mkdir js
+	fs.put()  // put the file into the .js folder 
+	runJs("js/countAndAverageDelayedFlights.js", "asv://airlinedata/", "jsFlightMR2");