This is Node.js

The talk I gave on UA Dev Club, 8-Jul-2014

Transcript

1. This is
   Node.js
   

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2. ceo@likeastore.com
   http://beletsky.net
   http://twitter.com/alexbeletsky
   

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3. "I was concerned about the ability to
   program advanced push features into
   the website like I had seen in Gmail"
   Ryan Dahl
   the creator of Node.js
   

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4. V8
   Google's open source JavaScript engine.
   V8 can run standalone, or can be embedded into any C++ application.
   

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5. LibUV
   High performance evented I/O
   Originally based on LibEV switch to LibUV with support of Windows
   

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6. JavaScript
   Dynamic, prototype-based language
   Highly popular due to browser programming
   

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7. http://jsconf.eu/2009/speakers.html
   

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8. Why JavaScript?
   functions as first-class citizen
   

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9. Why JavaScript?
   function as first-class citizen
   //closures..
   

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10. JavaScript designed for event-oriented systems
    There was a natural fit V8 + LibEV + JavaScript
    

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11. “Node.js is a platform for easily building
    scalable network applications. Node.js
    uses an event-driven (single threaded),
    non-blocking I/O model that makes it
    lightweight and efficient…”
    http://nodejs.org
    

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12. Non Blocking I/O
    The concept of accessing I/O without blocking of application
    

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13. https://www.flickr.com/photos/papyrist/
    Line to ATM is blocking I/O
    

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14. Mac’s Drive is non-blocking I/O
    

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16. execution started from first line..
    Output:
    

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17. async operation started…
    Output:
    

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18. but execution goes on..
    > ping
    Output:
    

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19. after ~ms file is read…
    > ping
    > pong
    Output:
    

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20. Event Driven
    Application flow is driven by events
    

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21. http://misclassblog.com/interactive-web-development/node-js/
    

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22. Single Threaded
    Single-thread programming concepts is more easy to understand. Applications
    running in single thread are lightweight and efficient
    

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23. “Node.js is designed for
    building efficient
    networking applications”
    

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24. Core components:
    !
    • HTTP / HTTPS
    • TCP / UDP / Sockets
    • DNS
    • File System
    • Crypto / Arch
    • Events
    • Streams
    

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25. Efficiency & Scalability
    Build-in server, high concurrency, horizontal scalability, clustering
    

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26. NPM
    Node Package Manager - the richest collection of high quality open source
    modules
    

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28. Thanks,
    @alexbeletsky
    

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