These guides are designed to make you immediately productive with Opal, and to help you understand how all of the pieces fit together.
The guides for earlier releases are available here.
Everything you need to know to install Opal and create your first application.
Learn more about JavaScript async/await support in Opal and how you can use it to avoid explicit callbacks and promises.
How to interact and leverage the power of JavaScript promises from Ruby.
How to enable and consume source-maps for your Opal application and be able to debug your Ruby scripts right inside the browser.
How to work with template libraries in Opal, be it to share the templates with the server or to write your own.
How to use opal-rails to use Opal as the JavaScript compiler.
The most basic setup for a static Opal powered website that can be hosted anywhere.
Serve Opal applications through Sinatra and opal-sprockets.
Setup Roda + Sprockets to start serving Opal applications from Roda.
This guide covers the opal-jquery wrapper around the popular library.
Write specs for your Opal code RSpec and run them on Node.js or in a browser.
Configure the long-lasting asset handler to work with Opal.
How to make your gem work in Opal and differentiate code for the JavaScript environment.
A very general overview of how the Opal compiler works.
This guide documents how each part of Ruby is mapped to JavaScript internally.
The Opal compiler supports some special directives that can optimize or enhance the output of compiled Ruby code to suit the Ruby environment.
This guide documents how to parse and run Ruby scripts within a browser or any supported JavaScript environment
(WIP) How to handle encoding within Opal in the browser and in the code.
How to run your Opal application in a headless Chrome from the CLI instead of Node.js.
Some things that are very difficult, impossible, or outright incompatible with a JavaScript environment.
This guide provides steps to be followed when you upgrade your applications to a newer version of Opal.
(WIP) A step-by-step guide on who to release a new version of Opal.