Introduction to node.js

node.js Jakub Nesetril jakub.nesetril@gmail.com

Who Are You?

Who Are You? • JS

Who Are You? • JS • Ruby

Who Are You? • JS • Ruby • web

Who Are You? • JS • Ruby • web • what real language do you speak?

TOC • blocking vs. non-blocking intro

TOC • blocking vs. non-blocking intro • short introduction to node.js

TOC • blocking vs. non-blocking intro • short introduction to node.js • examples

TOC • blocking vs. non-blocking intro • short introduction to node.js • examples • Q&A

Tags • #javascript , #v8 , #ssjs

Tags • #javascript , #v8 , #ssjs • #event-oriented

Tags • #javascript , #v8 , #ssjs • #event-oriented • #high-performance

Tags • #javascript , #v8 , #ssjs • #event-oriented • #high-performance • #asynchronous , #non-blocking

Tags • #javascript , #v8 , #ssjs • #event-oriented • #high-performance • #asynchronous , #non-blocking • #low-level

Tags • #javascript , #v8 , #ssjs • #event-oriented • #high-performance • #asynchronous , #non-blocking • #low-level • #fun!

What’s missing?

Tags • #javascript , #v8 , #ssjs • #event-oriented • #high-performance • #asynchronous , #non-blocking • #low-level • #stable , #mature (not!)

(non-) Blocking IO

(non-) Blocking IO • var rows = db.query(“SELECT * FROM…)

(non-) Blocking IO • var rows = db.query(“SELECT * FROM…) • rows.forEach…

(non-) Blocking IO • db.query(“SELECT * FROM…”, function(rows) { rows.forEach… });

Why isn’t everybody doing it?

Why isn’t everybody doing it? • non-blocking can be hard

Why isn’t everybody doing it? • non-blocking can be hard • JS is an ideal language / community for this

Why isn’t everybody doing it? • non-blocking can be hard • JS is an ideal language / community for this • Ajax / DOM has taught events to millions of people

Why isn’t everybody doing it? • non-blocking can be hard • JS is an ideal language / community for this • Ajax / DOM has taught events to millions of people • node.js = network servers in JS

Example 1

Design Principles

Design Principles • non-blocking - every IO must take callback

Design Principles • non-blocking - every IO must take callback • API should be familiar to client-side JS programmers ans old school UNIX hackers

Design Principles • non-blocking - every IO must take callback • API should be familiar to client-side JS programmers ans old school UNIX hackers • built-in support for HTTP, DNS, TLS

Design Principles • non-blocking - every IO must take callback • API should be familiar to client-side JS programmers ans old school UNIX hackers • built-in support for HTTP, DNS, TLS • support advanced features (chunked encoding, pipelining, hanging requests for websockets etc.)

Example 2

Ecosystem

Ecosystem • node modules (CommonJS)

Ecosystem • node modules (CommonJS) • npm

Ecosystem • node modules (CommonJS) • npm • connect & express

Ecosystem • node modules (CommonJS) • npm • connect & express • node-inspector

Ecosystem • node modules (CommonJS) • npm • connect & express • node-inspector • bounce

Advanced Topics

Advanced Topics • WebSockets

Advanced Topics • WebSockets • Server-side DOM

Advanced Topics • WebSockets • Server-side DOM • Performance

Advanced Topics • WebSockets • Server-side DOM • Performance • Hosting

NodeKnockout

http://webexpo.cz	121
http://webexpo.net	26
http://webexpo.innit.cz	8
http://www.linkedin.com	5
http://debook:8000	1
http://www.webexpo.net	1
http://test.webexpo.cz	1

Introduction to node.js

by Jakub Nešetřil

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