This document provides an overview of Node.js including its history, core concepts, and applications. Node.js is an open source JavaScript runtime built on Chrome's V8 JavaScript engine. It allows JavaScript to be used for non-browser applications including network programs and I/O operations. Some key aspects covered include asynchronous programming using callbacks and events, core modules like Net and HTTP, and using Node.js to build servers and APIs. Example applications mentioned are HTTP servers, databases, and APIs.

1. Art of NodeJs
By Shadaï ALI (craftsman)
shadai.ali@mehriso.com

2. • History (bla bla bla)
• Understanding NodeJS
• Core Modules
• Callbacks
• Events
• Streams
• Modules
• HTTP SERVER (Code Lab)
• EXPRESS (Code Lab)
• TOO MUCH FRAMEWORKS

3. History (bla bla bla)
Released In 2009
Google OpenSource V8
Ryan Dhal
Awesome JavaScript
Browsers War
JavaScript != Java
Active Community

4. Understanding NodeJS
Node.js is an open source project designed to help you
• write JavaScript programs
• that talk to networks,
• file systems
• or other I/O (input/output, reading/writing) sources (db..)
build on modules pattern

5. Understanding NodeJS

6. Understanding NodeJS
Asynchronous programming
Node.js is’t programming language, framework
Server Side Javascript
Easy to Understand an use
Very Fast
Big Community and Most Modules

7. NodeJS for Writing two major types of programs
Network Programs : HTTP,TCP,UDP,DNS, SSL
Programs that R&W data to the filesystem
or local processes/memory

8. ANY I/O
Databases (PostgreSQL, MongoDB, Redis,Titans,
CouchDB,MySQL,CASSANDRA….)
APIs (e.g. Twitter, Facebook, Apple Push Notifications)
HTTP/WebSocket connections (from users of a web app)
Files (image resizer, video editor, internet radio)

9. CORES MODULES
Net Http dgram fs url …

10. CORES MODULES
Net Http dgram fs url …
var fs = require('fs')

11. CORES MODULES
Net Http dgram fs url …
var fs = require(‘fs')
fs.readFile(‘number.txt’)

12. CALLBACK

13. EVENTS
CallBack => One to One
Event => One to many
Emit channel on