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Like Ruby WASI, it allows you to run Ruby in a web browser, but it takes a different approach - it is, like JRuby, a complete reimplementation of Ruby. Unlike Ruby WASI, you don't have to ship the entire Ruby compiler - you just ship your code compiled to JavaScript along with (possibly) minimal Ruby runtime. You can compare and contrast both on a recently updated TryRuby website (which itself - is a 100% Ruby frontend application compiled with Opal!).
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Judoscale
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Opal itself aims just at creating a Ruby runtime and a couple of life improvements, but there exist a couple of helper gems, for instance Opal-Browser (for an idiomatic API to interact with DOM and other browser APIs), Opal-Rails (for integrating with a Sprockets pipeline of Rails), Opal-RSpec (to test your frontend application). There exist a number of libraries and bindings to JS libraries for Opal.
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Opal itself aims just at creating a Ruby runtime and a couple of life improvements, but there exist a couple of helper gems, for instance Opal-Browser (for an idiomatic API to interact with DOM and other browser APIs), Opal-Rails (for integrating with a Sprockets pipeline of Rails), Opal-RSpec (to test your frontend application). There exist a number of libraries and bindings to JS libraries for Opal.
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Opal itself aims just at creating a Ruby runtime and a couple of life improvements, but there exist a couple of helper gems, for instance Opal-Browser (for an idiomatic API to interact with DOM and other browser APIs), Opal-Rails (for integrating with a Sprockets pipeline of Rails), Opal-RSpec (to test your frontend application). There exist a number of libraries and bindings to JS libraries for Opal.
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isomorfeus-project
Discontinued The powerful, isomorphic full stack web application development environment.
Opal itself is quite low level. It just gives you a compiler and Ruby runtime. There exist a couple of frameworks using Opal: two most developed are Hyperstack (deeply integrates Rails, Opal and React) and Isomorfeus (integrates Roda, Opal and Preact)
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CodeRabbit
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