Node.js is a JavaScript runtime built on Chrome's V8 engine that uses an event-driven, non-blocking I/O model to build fast, scalable network applications like real-time chat servers and file upload clients. It is well-suited for data-intensive real-time applications because JavaScript has no threads and uses an event-based concurrency model. Node.js allows building full-stack JavaScript applications using the MEAN stack with MongoDB, Express, AngularJS, and Node.js itself.

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Presented by: EDIT Presenter
Node.js 101
Feb 19, 2015
- Gauri Saykar

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Node.js
• Node.js is a platform built on Chrome's JavaScript
runtime for easily building fast, scalable network
applications.
- nodejs.org

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WHAT COULD YOU BUILD?
• DIRTy (Data Intensive Real-Time) applications
• Node.js uses an event-driven, non-blocking I/O model
that makes it lightweight and efficient, perfect for data-
intensive real-time applications that run across
distributed devices.
e.g.
- Chat server
- Fast file upload client
- Ad Server

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WHY JAVASCRIPT ?
• “JavaScript has certain characteristics that make it very
different than other dynamic languages, namely that it
has no concept of threads. Its model of concurrency is
completely based around events.”
- Ryan Dahl
• One language for web application development
• Native JSON support

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BLOCKING VS NON-BLOCKING CODE

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TYPICAL BLOCKING THINGS
• Calls out to web services
• Reads/Writes on the File/Database

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NON BLOCKING EXAMPLE

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EVENT LOOP

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MEAN STACK
• Mongo – NoSQL data store
• Express JS – lightweight web framework for Node.js
• Angular JS – client side web framework
• Node.js

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APP ARCHITECTURE

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THANK YOU
References:
• http://nodejs.org/
• http://courseware.codeschool.com/node_slides.pdf
• https://github.com/Saykar/Angular-Express