Node.js for beginner

Sep 15, 20151 like573 views

This document provides an introduction to Node.js for beginners. It defines Node.js as a server-side JavaScript platform that uses non-blocking I/O and an event-driven architecture. It discusses key Node.js concepts like callbacks, event loops, streams, and asynchronous programming. It also highlights how Node.js is well suited for building real-time applications and APIs due to its asynchronous and modular nature.

Node.js For Beginner
Sarunyhot Suvannachoti (Kao)
Software Engineer @ Jitta.com

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
• Single threaded
• Current Version is 4.0.0

Blocking I/O
30 Sec
10 Sec
Sum = 30 + 10

Non-Blocking I/O
Run parallel
min=10
max=30

The two model of Async Processing
• Callback function generally deﬁne logic for one-off responses.–
Ex: perform a database query
• Event listeners, are essentially callbacks that are associated with
a conceptual entity (an event).–Respond to repeating events –EX:
HTTP server emits a request event when an HTTP request is made

What is callback function?
• A callback is a function,passed as an argument to an asynchronous
function
• It describes what to do after the asynchronous operation has completed
Callback function

When to use Node.js?
• Creating streaming based real-time services,web chat
applications,static ﬁle servers etc.
• Applications that have a lot of concurrent connections and each
request only needs very few CPU cycles

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

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

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

Fabulous framework
• Express
• Restify (for building REST APIs, automatic DTrace support)
• Hapi (conﬁguration-centric framework)
• Sails (fast production-ready)
• Meteor (realtime application)

Module-driven development
• Node Package Manager (NPM)
• 180,000++ packages
• 90,000,000++ downloads per day
• Simplicity
• Decoupled and reusable coding

The state of the registry
• 1400MM package downloads last
month
• 150,000 packages in the registry
• `Node` is moving faster than `Node.js`

Module-driven development
• npm focused on module-driven development
• ES6 Modules
• Module-driven development for the browser
• Browser tools: Browserify

Module-driven development for the
browser
bower install moment --save
npm install moment --save

Where can learn more?
• http://nodeschool.io
• http://www.codewars.com
• https://www.codeschool.com/courses/real-time-web-with-node-js
• http://nodeup.com/

“Node's goal is to provide an easy way to build scalable Network programs” Asynchronous i/o framework Core in c++ on top of v8 Rest of it in javascript Swiss army knife for network Related stuffs Can handle thousands of Concurrent connections with Minimal overhead (cpu/memory) on a single process It’s NOT a web framework, and it’s also NOT a language • Created by Ryan Dahl in 2009 • Development && maintenance sponsored by Joyent • License MIT • Last release : 0.10.31 • Based on Google V8 Engine • +99 000 packages

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Node.js for beginner

1. Node.js For Beginner Sarunyhot Suvannachoti (Kao) 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 • Single threaded • Current Version is 4.0.0

3. Node.js Foundation Fork of Node.js +

4. Node.js Event loop

5. Blocking I/O

6. Blocking I/O 10 Sec 30 Sec

7. Blocking I/O 30 Sec 10 Sec Sum = 30 + 10

8. Non-Blocking I/O

9. Non-Blocking I/O Run parallel min=10 max=30

10. Asynchronous programming techniques

11. The two model of Async Processing • Callback function generally deﬁne logic for one-off responses.– Ex: perform a database query • Event listeners, are essentially callbacks that are associated with a conceptual entity (an event).–Respond to repeating events –EX: HTTP server emits a request event when an HTTP request is made

12. What is callback function? • A callback is a function,passed as an argument to an asynchronous function • It describes what to do after the asynchronous operation has completed Callback function

13. What is event-listeners?

14. What is event-listeners?

15. Stream

16. When to use Node.js? • Creating streaming based real-time services,web chat applications,static ﬁle servers etc. • Applications that have a lot of concurrent connections and each request only needs very few CPU cycles

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

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

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

20. Desktop Application (torrent)

21. Desktop Application (editor)

22. Desktop Application (music)

23. Desktop Application (game)

24. Fabulous framework • Express • Restify (for building REST APIs, automatic DTrace support) • Hapi (conﬁguration-centric framework) • Sails (fast production-ready) • Meteor (realtime application)

25. Module-driven development • Node Package Manager (NPM) • 180,000++ packages • 90,000,000++ downloads per day • Simplicity • Decoupled and reusable coding

28. The state of the registry • 1400MM package downloads last month • 150,000 packages in the registry • `Node` is moving faster than `Node.js`

29. Module-driven development • npm focused on module-driven development • ES6 Modules • Module-driven development for the browser • Browser tools: Browserify

30. Module-driven development for the browser bower install moment --save npm install moment --save

31. DEMO

32. Where can learn more? • http://nodeschool.io • http://www.codewars.com • https://www.codeschool.com/courses/real-time-web-with-node-js • http://nodeup.com/