Parallel task sink in Node.js

// Task sink in node.js
// Binds PULL socket to tcp://localhost:5558
// Collects results from workers via that socket.

var zmq = require('zmq')
, receiver = zmq.socket('pull');

var started = false
, i = 0
, label = "Total elapsed time";

receiver.on('message', function() {
// wait for start of batch
if (!started) {
console.time(label);
started = true;

// process 100 confirmations
} else {
i += 1;
process.stdout.write(i % 10 === 0 ? ':' : '.');
if (i === 100) {
console.timeEnd(label);
receiver.close();
process.exit();
}
}
});

receiver.bindSync("tcp://*:5558");