node js presentation

Jonathan Warner

What is Node.js ?

Node.js is a platform built on Chrome’s V8 JavaScript engine

The platform includes several standard modules and abstraction to build more.

It’s JavaScript without the browser.

And with I/O and networking.

And it’s fast.

What can it be used for?

web development

socket server

API backend

command-line apps

package manager

proxy server

RESTful endpoints

realtime web applications

database interface

preprocessing

occupying ram

improving hipster appeal

template processor

websocket endpoint

It’s different

In static hosting, PHP, ASP, and other more traditional models, a webserver loads, executes, and serves a specified file.

ex: http://localhost/index.php literally loads the file “index.php”

With Node, you’re writing the physical webserver application yourself.

This opens up several possibilities, as the developer has complete control over the entire web application.

The Vanilla Way

The Vanilla Way gives extreme control over the entire HTTP stack, and limits the need of third-party modules.

But what if you don’t like vanilla?

Node.js has a community package manager containing over 46,581 modules

(Node Package Manager)

Node.js installs npm with it, making it globally available on the command line.

npm installs dependencies, updates modules, creates modules, installs Node.js command line apps, and more.

npm makes it quick and easy to install and update third-party modules in your application

back to the web stuff.

npm contains several packages for streamlining the development of web applications

“minimal and flexible node.js web application framework”

Taking it realtime

“aims to make realtime apps possible in every browser and mobile device, blurring the differences between the different transport mechanisms”

Any questions?

Node.js, docs, etc: http://nodejs.org/

Tutorials: “nodejs tutorials” = About 447,000 results

These slides, examples, etc:

http://jaxbot.me/

tl;dr: Node.js is fast and easy. Try it!

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Introduction to Node.js®

This PPT was used as a KSM talk on Node.js @iiit-Bangalore

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Nodejs-presentation.

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What is Node.js

Node.js® is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network 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.

Problematic

I/o latency, conventional solution, multi-threading.

Context switching overhead
Memory consumption
Manage concurrency

Multi processes

High memory usage
Process scheduling overhead

Node.JS answer

Scale with event loop.

Delegate the I/O part to a Thread Pool or when it is possible to a native asynchronous I/O API

Event Loop theory

Delegate I/O part and manage callbacks

npm is the default package manager for Node.js.

It manages dependencies for an application.

It also allows users to install Node.js applications that are available on the npm registry.

Multi-Platform (Linux, Mac, Windows)

One development language JS on client and server side

Open source technology

Many NPM packages availables on npmjs.org

Short learning curve (Event loop theory, JavaScript, Evented programming)

Few metrics

Computation, read file and display it, simple http server, live coding.