Node.js Kick Start was a first community meet-up in Chennai about Node.js. Node.js is a server-side JavaScript application framework that uses an event-driven, non-blocking I/O model. It was created in 2009 and its governance is now overseen by the Node.js Foundation. The document discusses Node.js' history and key features like its event-driven and asynchronous nature, and how writing asynchronous code differs from traditional synchronous approaches. It also introduces NPM, the Node.js package manager.

1. Node.js Kick Start
First Node Community Meet-Up in Chennai

2. What Node.js is not?
• not a programming language
• not just a JavaScript Engine

3. What Node.js actually is?
• server-side web application development framework
• It is also a javascript engine
Where to use Node.js?
It is not advisable to use Node.js for CPU intensive applications.
Why not? Let’s learn..

4. Node.js Background

5. Brief History of Node.js
• Ryan Dahl - 2009-2012
• Isaac Schlueter - 2012-2014
• Timothy J Fontaine - 2014 - 2015
• Fedor Indutny - io.js 2015
• io.js & Node.js merged in 2015
• First merged release was v4.0.0 in 2015

6. How the system works?
• open-source
• open-governance
Node.js Foundation
• Board of Directors
• TSC

7. Versions
• Strictly semver
• LTS - v4.4.3
• Current - v6.0.0

8. Features of Node.js
• Event Driven
• Non-blocking I/O
• Single Threaded but highly scalable

9. Building Blocks of Node.js

14. Writing asynchronous code is different
Typical Approach
var conn = getDbConnection(connectionString);
var stmt = conn.createStatement();
var results = stmt.executeQuery(sqlQuery);
for (var i = 0; i < results.length; i++) {
// print results[i];
}

15. An asynchronous non-blocking approach
getDbConnection(connectionString, function (err, conn) {
// callback
if (err) {
//Handler errors
}
conn.createStatement(function (error, stmt) {
//callback
if(error) {
//Handle errors
}
var results = stmt.executeQuerty(sqlQuery);
results.on('row', function (result) {
// Event emitted for the rows
//print result
});
});
});
Writing asynchronous code is different

20. What is NPM?
• package manager (like maven, sbt)
• Isaac Schlueter - npm, Inc
• package.json
• Custom modules

21. Let’s see them in Action
…

22. Thank You!