Running the Demo
Ruby2JS provides a web + CLI based demo tool you can use to try out Ruby code and see how it converts to JavaScript. (This is same tool used for the online demo).
Usage
The following two commands will start a server and a launch a browser:
git clone https://github.com/ruby2js/ruby2js.git
ruby ruby2js/demo/ruby2js.rb --port 8080
From the page that is loaded, enter some Ruby code into the text area and press the convert button. Dropdowns are provided to change the ECMAScript level, filters, and options. A checkbox is provided to show the Abstract Symbol Tree (AST) produced.