![REQUIRE
• Node uses the commonJS module system
• returns the exported API of a module
// math.js
exports.add = function() {
var sum = arguments[0];
for (var i=1; i<arguments.length; i++) {
sum += arguments[i];
}
return sum;
};
// app.js
var add = require('math').add;
add(4, 8, 15, 16, 23, 42); //-> 108](https://image.slidesharecdn.com/expressjspresentation-100415231549-phpapp02/85/Express-Presentation-19-320.jpg)
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Express Presentation
- 1. EXPRESS web framework for node Aaron Heckmann aaronheckmann@gmail.com Area 15 http://twitter.com/aaronheckmann April 15 2010
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- 14. evented I/O forV8 javascript
- 15. ASYNC I/O <?php // Iblock! $data = file_get_contents($file) // do stuff with $data ?>
- 16. ASYNC I/O <?php // Iblock! $data = file_get_contents($file) // do stuff with $data ?> jQuery.ajax({ success: function(data) { // do something with data } })
- 17. ASYNC I/O <?php // Iblock! $data = file_get_contents($file) // do stuff with $data ?> jQuery.ajax({ success: function(data) { // do something with data } }) // I don’t block! var fs = require('fs') fs.readFile(file, function(err, data) { // i can has data })
- 19. REQUIRE • Node uses the commonJS module system • returns the exported API of a module // math.js exports.add = function() { var sum = arguments[0]; for (var i=1; i<arguments.length; i++) { sum += arguments[i]; } return sum; }; // app.js var add = require('math').add; add(4, 8, 15, 16, 23, 42); //-> 108
- 20. FAMILIAR • addListener() • removeListener() •setTimeout() • setInterval()
- 21. LOW LEVEL • HTTP / TCP / DNS • file system • child processes • event emitters • and streams, oh my!
- 22. • lots • lots •more
- 24. EXPRESS • simple install • built on node • async rendering • plugable
- 25. SIMPLE INSTALL $ gitclone git://github.com/visionmedia/express.git $ cd express && git submodule update --init or $ kiwi -v install express
- 26. BUILT ON NODE //app.js require.paths.unshift('path/to/express/lib') require('express') get('/', function(){ this.redirect('/hello/world') }) get('/hello/world', function(){ return 'Hello World' }) run() $ node app.js Express started at http://localhost:8000/ in development mode
- 27. ASYNC RENDERING get('/', function(){ return '<!doctype html><html><head><title>...' })
- 28. ASYNC RENDERING get('/', function(){ var self = this // => Request })
- 29. ASYNC RENDERING get('/', function(){ var self = this db.get(someUserId, function(err, user) { if (err) return self.error(err); }) })
- 30. ASYNC RENDERING get('/', function(){ var self = this db.get(someUserId, function(err, user) { if (err) return self.error(err); self.render('home.html.haml', { layout: 'layout-public’, locals: { title: 'intro to express', firstname: user.firstname } }) }) })
- 32. #wrap .welcome %p= “Hello ” + firstname + “!” <div id=“wrap”> <div class=“welcome”> <p>Hello Aaron!</p> </div> </div>
- 34. .welcome :margin5px p :color #2C7C00 :text-shadow 1px 2px 1px #ddd .welcome { margin: 5px; } .welcome p { color: #2C7C00; text-shadow: 1px 2px 1px #ddd; }
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- 36. PLUGABLE • View, Cache,Redirect, etc (defaults) • Cookie, Session, Flash, Logger, Static, etc (optional) • 3rd party session persistence (MongoDB, Redis) • Async!
- 37. PLUGABLE var Logger =require('express/plugins/logger').Logger use(Logger, {format: 'combined'})
- 38. MOAR • partials & flash messaging • custom error pages (500, 404) • http (async curl) • uploads • custom environment configurations • ES5 (v8)
- 39. THANK YOU • http://expressjs.com/ • http://groups.google.com/group/express-js • http://github.com/visionmedia/express • http://nodejs.org/ • http://groups.google.com/group/nodejs • http://wiki.github.com/ry/node/modules • http://twitter.com/expressjs • http://twitter.com/aaronheckmann