1. node.js dao Vova Miguro

2. What’s it all about?

5. traditional I/O var data = file.read( ‘image.png’ ); //zzz... doSomething(data); something not right here...

6. async I/O file.read( ‘image.png’ , function (data){ doSomething(image); }); doSomethingElse(); profit!

7. callback() callback() callback()

10. http server var http = require( 'http' ); http.createServer( function (req, res) { res.writeHead( 200 , { 'Content-Type' : 'text/plain' }); res.end( 'Hello World' ); }).listen( 3000 );

11. watch file var fs = require( 'fs' ); fs.watchFile( 'system.log' , function () { console.log( 'log changed!' ); });

13. node & mongo var mongodb = require( 'mongodb' ); var server = new Server( '127.0.0.1' , 27017 , {}); new Db( 'test' , server, {}).open( function (error, client) { var collection = new Collection(client, 'tmp' ); //insert doc collection.insert({a: 12 ,b: 'string' },{},function(){ //find doc collection.find({}, {limit: 10 }).toArray( function (err, docs) { //do smth with docs }); }); });

14. node & web sockets //server var io = require( 'socket.io' ).listen( 80 ); io.sockets.on( 'connection' , function (socket) { socket.emit( 'news' , {hello: 'world' }); }); //client var socket = io.connect( ' http://localhost ' ); socket.on( 'news' , function (data) { console.log(data); });

15. let’s see...

18. ?