This document summarizes RingoJS, an open source JavaScript platform that runs on the Java Virtual Machine. It can install and run with a few commands, supports CommonJS modules and features like a REPL, debugger, profiling, and running synchronous and asynchronous code. The document provides code examples for a simple "Hello World" app, a JSONP proxy, parallel processing using threads, and links to RingoJS libraries and community resources.

1. RingoJS #cgnjs talk by Oleg Podsechin 12.10.2010

3. Install & Run apt-get install default-jdk default-jre git-core ant git clone git://github.com/ringo/ringojs.git ant jar bin/ringo

4. Hello World >> 'Hello World' Hello World

5. Hello World, Take Two new ( require ( 'ringo/httpserver' ) . Server )({ app : function () { return { status : 200 , headers : {} , body : [ 'Hello World' ]} ; } }) . start () ;

6. RingoJS overview started by @hannesw ( hns.github.com ) uses Mozilla Rhino runs on the JVM successor to Helma, HelmaNG been in development for 10+ years conforms to CommonJS

7. CommonJS support Modules/1.0, Modules/1.1 JSGI Binary Filesystem System Unit Testing other (mostly partial) implementations include: Akshell, CouchDB, Flusspferd, Narwhal, Persevere, RequireJS, Smart, SproutCore, node.js, v8cgi etc .

8. RingoJS features #1 REPL hot reloading of modules profiler debugger ringo-admin tool runs anywhere, including AppEngine client side CommonJS modules via ringo-modulr JMX

9. RingoJS features #2 JavaScript 1.8 Java library wrapping runs sync and async code continuations introspection (via Rhino) middleware templating utils persistence abstraction layer

10. jsonp-proxy.js #1 // thanks to @jasondavies var { encode } = require ( 'ringo/base64' ) , { get } = require ( 'ringo/httpclient' ) , { Request } = require ( 'ringo/webapp/request' ) , { ByteString } = require ( 'binary' ) ; exports. app = function ( env ) { var req = new Request ( env ) ; var url = req. params . url , raw = get ( url ) ; return { status : 200 , headers : { 'Content-Type' : 'text/javascript' } , body : [ req. params . callback + '("data:"+decodeURIComponent("' + encodeURIComponent ( raw. type ) + '")+";base64,' , encode ( new ByteString ( raw. content )) , '")' ] } ; }

11. jsonp-proxy.js #2 Usage: $. get ( 'http://seivadnosaj-js.appspot.com/proxy' , { url : 'http://www.jasondavies.com/media/img/jason.jpg' } , function ( data ) { var img = new Image () ; img.onload = function () { var w = img. width , h = img. height ; $ ( '#canvas' ) . attr ( 'width' , w ) . attr ( 'height' , h ) ; context. width = w ; context. height = h ; context. drawImage ( img , 0 , 0 , w , h ) ; } ; img. src = data ; } , 'jsonp' ) ; Try it at: http://seivadnosaj-js.appspot.com/

12. Multithreaded JS (sort of) // run &quot;test&quot; in &quot;threads&quot; parallel threads a total of &quot;count&quot; times function parallel ( test , count , threads ) { var pool = new java. util . concurrent . Executors . newFixedThreadPool ( threads ) ; function runnable ( f ) { return new java. lang . Runnable ({ run : function () { try { f () ; } catch ( e ) { } }}) ; } for ( var i = 0 ; i < count ; i ++ ) pool. execute ( runnable ( test )) ; }

13. Debugger

14. Ride - web IDE

15. RingoJS libraries search GitHub for ringo- ringo-admin install user/repo

16. RingoJS performance

17. RingoJS community active & friendly #ringojs on Freenode IRC #ringojs & @ringojs on Twitter http://github.com/ringo

18. Questions? Comments? @olegpodsechin