Node js for beginners

Jul 26, 2015Download as PPTX, PDF3 likes988 views

An absolute beginners guide to node.js . Done for a presentation at college. The presentation contains data from various sources ,sources are noted at the end slide. please inform me any mistakes ,since at that time i was in a bit of hurry :)

★ Javascript & the V8 Engine
★ Intro to node js
★ Features of Node js
★ Examples of Node js
★ Node js in the industry
★ How to install
★ NPM
★ Hello world
★ Frameworks and Extensions
★ Future learning
★ References
What’s going to be covered?

javascript
● Browser side programming
● Event handling on the client side
● Adding interactivity to web pages

● v8 is a super fast javascript library built by google for
chrome
● Compiles javascript directly into machine code instead of
interpreting
● JIT(Just In Time ) compilation
● Written in c++

what the js is node?
● Node.js = javascript +google v8 on the
server
● Additional features for javascript to run on
the server
● Handle server side events
● Cross operating system compatible

Event driven
● Just like javascript events on the client,Node can
handle various events on the server
● Examples of server events are,file transfer,request
for a page,loading content from database

Non blocking I/O
● Traditional applications waits for a set code to
complete before it displays the content.This is called
blocking code
● in non blocking Once the request is made we
continue on to the next line of code before waiting
for the time consuming request to finish
● Uses callback functions to handle non blocking
code

Scalable
● Node applications are highly scalable
● Horizontal scaling of servers
● Adding more servers instead of increasing the
performance of each

what we can make with node?
● Real time chat applications
● Upload huge amounts of data
● Data streaming applications
● Distributed ,clustered systems and embedded systems
● Applications that can handle millions of concurrent
connections .
● Control Robots and drones through WLAN

A little bit of History
● Node.js was invented in 2009 by Ryan Dahl
● inspired to create Node.js after seeing a file
upload progress bar on Flickr
● Opensource,sponsored by Joyent and
microsoft
● Ryan was a mathematics student and
dropped out of college.

Installing node.js
● for windows download the exe
https://nodejs.org/download/
● On linux just type
sudo apt-get install nodejs
sudo apt-get install npm

NPM node package manager
● Node package manager(NPM) is a component of node
js
● NPM fetches packages just like apt-get in ubuntu
● Packages are plugins or commonly used modules that
add more functions to node.Just like beans in java
● NPM manages the dependency of the packages.

HELLO world!
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
console.log("The server just go a request");
res.write("Hello world");
res.end();
}).listen(9615);

FRAMEWORKS & EXTENSIONS
● Express.js web application framework similar to python django or ruby
on rails
● Cyclon.js Building WLAN/internet controlled robots and drones using
node.js
● Sails.js MVC web application frameworks
● Socketstream Real Time applications .

Moving ahead!
● The best way to learn node is to use and
interactive tutorial called nodeschool
● Available as an Npm package :
npm install -g learnyounode
● Official node.js documentation

References
● Official Node.js Documentation
● Nodeschool.io
● Wikipedia
● Node.js presentation by Gabriele Lana
● Toptal.com,code.tutsplus.com,Google developers

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Node js for beginners

1. S Arjun S4 BCA Amrita University,Kollam

2. ★ Javascript & the V8 Engine ★ Intro to node js ★ Features of Node js ★ Examples of Node js ★ Node js in the industry ★ How to install ★ NPM ★ Hello world ★ Frameworks and Extensions ★ Future learning ★ References What’s going to be covered?

3. javascript ● Browser side programming ● Event handling on the client side ● Adding interactivity to web pages

4. Google v8 javascript Engine

5. ● v8 is a super fast javascript library built by google for chrome ● Compiles javascript directly into machine code instead of interpreting ● JIT(Just In Time ) compilation ● Written in c++

6. what the js is node? ● Node.js = javascript +google v8 on the server ● Additional features for javascript to run on the server ● Handle server side events ● Cross operating system compatible

7. What makes node better?

8. Event driven ● Just like javascript events on the client,Node can handle various events on the server ● Examples of server events are,file transfer,request for a page,loading content from database

10. Non blocking I/O ● Traditional applications waits for a set code to complete before it displays the content.This is called blocking code ● in non blocking Once the request is made we continue on to the next line of code before waiting for the time consuming request to finish ● Uses callback functions to handle non blocking code

11. Scalable ● Node applications are highly scalable ● Horizontal scaling of servers ● Adding more servers instead of increasing the performance of each

13. what we can make with node? ● Real time chat applications ● Upload huge amounts of data ● Data streaming applications ● Distributed ,clustered systems and embedded systems ● Applications that can handle millions of concurrent connections . ● Control Robots and drones through WLAN

14. who uses node.js And many more...

15. A little bit of History ● Node.js was invented in 2009 by Ryan Dahl ● inspired to create Node.js after seeing a file upload progress bar on Flickr ● Opensource,sponsored by Joyent and microsoft ● Ryan was a mathematics student and dropped out of college.

16. Installing node.js ● for windows download the exe https://nodejs.org/download/ ● On linux just type sudo apt-get install nodejs sudo apt-get install npm

17. NPM node package manager ● Node package manager(NPM) is a component of node js ● NPM fetches packages just like apt-get in ubuntu ● Packages are plugins or commonly used modules that add more functions to node.Just like beans in java ● NPM manages the dependency of the packages.

18. HELLO world! var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/html'}); console.log("The server just go a request"); res.write("Hello world"); res.end(); }).listen(9615);

19. FRAMEWORKS & EXTENSIONS ● Express.js web application framework similar to python django or ruby on rails ● Cyclon.js Building WLAN/internet controlled robots and drones using node.js ● Sails.js MVC web application frameworks ● Socketstream Real Time applications .

20. Moving ahead! ● The best way to learn node is to use and interactive tutorial called nodeschool ● Available as an Npm package : npm install -g learnyounode ● Official node.js documentation

21. References ● Official Node.js Documentation ● Nodeschool.io ● Wikipedia ● Node.js presentation by Gabriele Lana ● Toptal.com,code.tutsplus.com,Google developers

22. THANK YOU