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node.jsevented I/O for V8 JavaScript
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what is node?Server-side JavaScript done right.
Runs on V8
An environment for developing high-performance web services
Evented TCP stack
Not a framework
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why node?Web applications spend most of their timedoing I/O
JavaScript is the language of the web
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V8
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V8Google's open source JavaScript engine.
Developed by Lars Bak.
Fast: compiles JavaScript to machinecode.
Implements most of ECMAScript 5.
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ECMAScript 5
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ECMAScript 5
Safe prototype extensionObject.defineProperty(Object.prototype, "forEach", { value: function (callback) { var keys = Object.keys(this);
for (var i = 0, key; i < keys.length; i++) { key = keys[i]; callback.call(this, key, this[key]); } }});
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ECMAScript 5
Access to the hidden prototypesObject.getPrototypeOf([]) // Array[].__proto__ // Array [].__proto__.__proto__ // Object
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ECMAScript 5
Basic prototypal inheritancevar o = Object.create({ foo: 42 });
o.bar = "bah";
Object.keys(o) // ["bar"]
o.foo // 42o.__proto__ // { foo: 42 }
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node.js
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node.js
Event-driven programming
Asynchronous I/O
Callbacks
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node.js
Common.js module systemvar sys = require("sys");
sys.puts("hello world");
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node.js
Common.js module systemrequire.paths // ["./lib", ...]__dirname // this dirname__filename // this filename
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node.js
Simple HTTP servervar http = require('http');
http.createServer(function (request, response) { response.writeHead(200, { 'Content-Type':'text/plain' }); response.end('Hello World\n');}).listen(8000);
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Event-drivenprogramming
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setTimeout(function () { // Do something after 1 second}, 1000);
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process.nextTick(function () { // Do something asynchronously});
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Async error handlingprocess.addListener('uncaughtException', function (err) { // Handle exception });
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Async signal handlingprocess.addListener('SIGINT', function (err) { // Handle Ctrl-C });
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modules
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file-system modulerequire('fs');
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modules
fsone-to-one mapping with unix commands
most functions have a synchronousversion
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Asynchronous file statfs.stat("path/to/file", function (err, res) { if (res) { // Handle success } else { // Handle error }});
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Synchronous file statvar res = fs.statSync("path/to/file");
if (res) { // Handle success } else { // Handle error }
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http://nodejs.org
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@cloudheadAlexis Sellier
http://github.com/cloudhead/node-intro
