logical-and/2nd task.html

## 2nd task.html
<!doctype html>
<html lang="en-US">
<head>
	<meta charset="UTF-8">
	<script src="//ajax.googleapis.com/ajax/libs/mootools/1.4.5/mootools-yui-compressed.js"></script>
</head>
<body>
<script type="text/javascript">
	console.log((function (servers, neededServers, neededClusters, performanceDegradation) {
		var defaultServerStringSeparator = "\n",
			defaultPerformanceDegradation = performanceDegradation || .3;

		function fetchServersString(servers, separator) {
			if (! separator) separator = defaultServerStringSeparator;

			return servers
				.split(separator)
				.filter(function (v) { return ! ! v; })
				.map(function (v) {
					var split = v.split(';');
					return {
						address    : split[0],
						distance   : parseFloat(split[1]),
						performance: parseFloat(split[2])
					};
				});
		}

		function serversPerformance(servers, degradation) {
			if (undefined === degradation) degradation = defaultPerformanceDegradation;
			var performance = 0, distance = 0;

			servers.each(function (server, i) {
				performance += server.performance;
				if (i) distance += server.distance; // don't calculate first element
			});

			// Fix a performance with performance degradation
			performance -= distance * degradation;

			return performance;
		}

		// Workhorse
		function getClusters(serversInClusters, clusterCount) {
			var clusters = [],
				actualServers = Array.clone(servers); // to prevent modify of original servers array

			for (var c = 0; c < clusterCount; c ++) {
				var cluster = [];
				for (var s = 0; s < serversInClusters; s ++) {
					if (! actualServers.length) throw new Error('No servers left, needed servers (in each cluster): ' +
						serversInClusters + ', clusters: ' + clusterCount + ', builded clusters: ', clusters);

					cluster.push(actualServers[0]);
					actualServers.shift(); // remove first [0] element
				}
				clusters.push(cluster);
			}

			return clusters;
		}

		function sortClustersByPerformance(clusters) {
			if (clusters.length < 2) return clusters; // we don't need any type of sorting on this

			// Sort it as required
			return clusters.sort(function (cluster1, cluster2) {
				return serversPerformance(cluster2) - serversPerformance(cluster1);
			});
		}

		function clustersToString(clusters) {
			var str = [];

			clusters.each(function (cluster) {
				var clstr = [];
				cluster.each(function (server) {
					clstr.push([server.address].join(';'));
				});
				str.push(clstr.join(';') + ' (мощность кластера: ' + serversPerformance(cluster) + ')');
			});

			return str.join(defaultServerStringSeparator);
		}

		servers = fetchServersString(servers);

		return clustersToString(sortClustersByPerformance(getClusters(neededServers, neededClusters)))
	})(
			"192.168.0.1;0;3\n" +
				"192.168.0.2;0.5;5\n" +
				"192.168.0.3;10;5\n" +
				"192.168.0.4;10;3\n",
				2,
				2
		));
</script>
</body>
</html>
	<!doctype html>
	<html lang="en-US">
	<head>
	<meta charset="UTF-8">
	<script src="//ajax.googleapis.com/ajax/libs/mootools/1.4.5/mootools-yui-compressed.js"></script>
	</head>
	<body>
	<script type="text/javascript">
	console.log((function (servers, neededServers, neededClusters, performanceDegradation) {
	var defaultServerStringSeparator = "\n",
	defaultPerformanceDegradation = performanceDegradation \|\| .3;

	function fetchServersString(servers, separator) {
	if (! separator) separator = defaultServerStringSeparator;

	return servers
	.split(separator)
	.filter(function (v) { return ! ! v; })
	.map(function (v) {
	var split = v.split(';');
	return {
	address : split[0],
	distance : parseFloat(split[1]),
	performance: parseFloat(split[2])
	};
	});
	}

	function serversPerformance(servers, degradation) {
	if (undefined === degradation) degradation = defaultPerformanceDegradation;
	var performance = 0, distance = 0;

	servers.each(function (server, i) {
	performance += server.performance;
	if (i) distance += server.distance; // don't calculate first element
	});

	// Fix a performance with performance degradation
	performance -= distance * degradation;

	return performance;
	}

	// Workhorse
	function getClusters(serversInClusters, clusterCount) {
	var clusters = [],
	actualServers = Array.clone(servers); // to prevent modify of original servers array

	for (var c = 0; c < clusterCount; c ++) {
	var cluster = [];
	for (var s = 0; s < serversInClusters; s ++) {
	if (! actualServers.length) throw new Error('No servers left, needed servers (in each cluster): ' +
	serversInClusters + ', clusters: ' + clusterCount + ', builded clusters: ', clusters);

	cluster.push(actualServers[0]);
	actualServers.shift(); // remove first [0] element
	}
	clusters.push(cluster);
	}

	return clusters;
	}

	function sortClustersByPerformance(clusters) {
	if (clusters.length < 2) return clusters; // we don't need any type of sorting on this

	// Sort it as required
	return clusters.sort(function (cluster1, cluster2) {
	return serversPerformance(cluster2) - serversPerformance(cluster1);
	});
	}

	function clustersToString(clusters) {
	var str = [];

	clusters.each(function (cluster) {
	var clstr = [];
	cluster.each(function (server) {
	clstr.push([server.address].join(';'));
	});
	str.push(clstr.join(';') + ' (мощность кластера: ' + serversPerformance(cluster) + ')');
	});

	return str.join(defaultServerStringSeparator);
	}

	servers = fetchServersString(servers);

	return clustersToString(sortClustersByPerformance(getClusters(neededServers, neededClusters)))
	})(
	"192.168.0.1;0;3\n" +
	"192.168.0.2;0.5;5\n" +
	"192.168.0.3;10;5\n" +
	"192.168.0.4;10;3\n",
	2,
	2
	));
	</script>
	</body>
	</html>