Callbacks are often found in JavaScript code. Some say ‘They are inconvenient and make code harder to understand’. Actually, it is a matter of habit and JS code may be as readable and easy to understand as any other. Additionally, this approach of coding allow us to ‘release’ program flow. No function is waiting for another’s result. Everything goes like stream.

Few month ago there was buzz around Node.js: Google’s V8 JavaScript engine acting as server. Before that nobody thought about event-based programming on server side. Every I/O operation in Node.js is asynchronous (database queries, reading from file or fetching content of some webpage). These are all the time used in web applications, especially real-time ones. Besides, lightweight and high-performance Nginx server is using event model.

There is enough articles about Node.js functioning. Today, I’ll show how to create real application that is checking in continuous way if our code project in JSLint by Douglas Crockford. All with growl notifications.

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