This document provides an introduction to Node.js, including: - Node.js allows JavaScript to be run on the server-side using the V8 JavaScript engine. - It uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. - Node.js supports module-driven development through NPM, which has over 250,000 packages available.

1. Node.js For Beginner
Kao #YWC9
Software Engineer @ jitta.com

2. What is Node.js
• Created by Ryan Dahl in 2009
• Server-side JavaScript
• Uses V8 is an open source JavaScript engine
developed by Google. Its
• written in C++ and is used in Google Chrome
Browser
• Event-driven with Non-blocking I/O

3. The Essence of Node
• JavaScript on the Server
• More than server-side JavaScript
• Fabulous framework
• Asynchronous programming
• Module-driven development

4. It’s is JavaScript
• Easy to learn
• Lets you unify your client/server logic
• Productivity
• Already in the Enterprise (Paypal, Netflix, Walmart,
IBM)

5. More than server-side
JavaScript
• Web server
• Robot controller (tessel.io)
• Command line application
• Proxy server
• Music machine
• Desktop application tooling: NW.js, Electron

6. Module-driven development
• Node Package Manager (NPM)
• 250,000++ total packages
• 160,000,000 downloads per day
• Simplicity
• Decoupled and reusable coding

7. Module-driven development
• npm focused on module-driven development
• ES6 Modules
• Module-driven development for the browser
• bower install moment —save
• npm install moment —save

8. Desktop Application(torrent)

9. Desktop Application (editor)

10. Game Dev Tycoon

11. Fabulous Framework
• Express
• Restify (for building REST API)
• Hapi (configuration-centric framework)
• Sails (fast production-ready)
• Meteor (realtime application)

12. Asynchronous programming

13. 5s0s 10s
BLOCKING

14. 5s0s 10s
NON-BLOCKING

15. Create node module

16. What is Node made of?

17. Event Loop

18. V8 JavaScript Engine
• V8 is Google's open source JavaScript engine
• V8 implements ECMAScript as specified in
ECMA-262
• V8 is written in C++ and is used in Google Chrome,
the open source browser from Google
• V8 can run standalone, or can be embedded into any
C++ application

19. Create Event Emitter

20. Stream and Buffer

21. Stream
• A sequence of data made available over time

22. Buffer
• A temporary holding spot for data being moved from
one place to another
Hello World
Buffer Buffer

23. Stream
Lorem ipsum dolor sit
amet, consectetur
adipisicing elit, sed do
eiusmod tempor
incididunt ut labore et
dolore magna aliqua. Ut
enim ad minim veniam,
quis nostrud exercitation
ullamco laboris nisi ut
aliquip ex ea commodo
consequat. Duis aute
irure dolor in
lowercase.txt
LOREM IPSUM DOLOR
SIT AMET,
CONSECTETUR
ADIPISICING ELIT, SED
DO EIUSMOD TEMPOR
INCIDIDUNT UT LABORE
ET DOLORE MAGNA
ALIQUA. UT ENIM AD
MINIM VENIAM, QUIS
NOSTRUD
EXERCITATION
ULLAMCO LABORIS NISI
uppercase.txt
stream

24. Stream
Process
Stream
roL e m

25. Stream
Process
Stream
Lorem
buffer
LOREM
buffer

26. Stream
Process
Stream
ipsum
buffer
IPSUM
buffer

27. Stream
Process
Stream
LOREM IPSUM

28. Stream
LOREM IPSUM DOLOR
SIT AMET,
CONSECTETUR
ADIPISICING ELIT, SED
DO EIUSMOD TEMPOR
INCIDIDUNT UT LABORE
ET DOLORE MAGNA
ALIQUA. UT ENIM AD
MINIM VENIAM, QUIS
NOSTRUD
EXERCITATION
ULLAMCO LABORIS NISI
uppercase.txt

29. What is pipe
• Connecting two streams by writing to one stream
• Let you easily read data from a source and pipe it to
a destination

30. Another Stream
Pipe
Process
Readable Stream
pipe
Process
Hello
Writeable Stream

31. Write Stream

32. Build App with Node

33. Browser
Request
Response
Web
Server

34. Browser
Request
Response
Web
Server
HTTP
HTTP

35. Browser
Request
Response
Web
Server
HTTP
HTTP
Javascript

36. Browser
Request
Response
Web
Server
HTTP
HTTP
Javascript
Javascript

37. What’s JavaScript on Server-
side
• Read and write file
• Connect with databases
• Build web server
• Asynchronous task queue/job queue

38. Create http server