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Ruby Is dead.

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Ruby Is now more alive than ever!

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Who am I? twitter.com/mehowte [email protected] ! " github.com/mehowte # Michal Taszycki gunpowderlabs crossplatformruby.com

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Remember Javascript? Meteor

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But now… We have the technology!

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Opal.rb

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Opal.rb • Ruby to Javascript compiler • Performant • Version < 1.0, actively developed • Out of the box Rails integration • Interesting libraries start to show up

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RubyMotion

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RubyMotion • Compiles Ruby to ObjectiveC runtime • Android Support will be available soon • Native performance • Version > 2.0, actively developed • Widely used in production

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mruby

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mruby • Supports ISO ruby standard • Can be embedded into any C application • low memory footprint • Faster than MRI • Works even on Arduino DUE (requires 96KB SRAM) • Promising for Windows desktop applications

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Is any of them really a Ruby == ? == ? == ?

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Differences • No require at runtime • No eval at runtime • Methods can have incompatible names • Threads are working • Memory leaks possible

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Differences • no require at runtime • strings are immutable • symbols are strings • regexps differ • All numbers are ﬂoats • no for loop yet ;)

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Differences • no require at runtime • gems (mrgems) need to be compiled into mruby • no Bignumber support • Regular Expressions unavailable by default • optimized for size (but ofter faster than MRI)

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Is any of them really a Ruby

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They’re Ruby enough!

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Cross Platform Ruby

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Cross Platform Ruby

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Interactions

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Internal interactions Hexagonal Clean Architecture DCI DDD CQRS Cowboy Coding Functional Programming Micro Libraries

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This is your dreamland! Internal interactions DCI Hexagonal Clean Architecture DCI DDD Cowboy Coding Functional Programming CQRS Micro Libraries

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Interactions

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Access From Outside title_label.text = translator.get(:title)

<%= translator.get(:title) %>

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Access From Outside event_logger.save_event(:user_signed_up) event_logger.save_event(:user_tapped_on_top_left_button) event_logger.save_event(:user_bought_an_in_app_purchase, type: "coin", amount: 1000) event_logger.save_event(:user_signed_in) event_logger.save_event(:user_browsed_products) event_logger.save_event(:user_bought_product, name: "beef_jerky", amount: 35)

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Interactions

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Driving from inside # toggle panels - same interface # for animation on all platforms ! image_editor_controller.animate_view( brushes_panel, :horizontall_slide, from: 0, to: -90) ! image_editor_controller.animate_view( shapes_panel, :horizontall_slide, from: -90, to: 0)

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Interactions

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class TodoItem def mark_as_done self.done = true end end Async interactions

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! ! ! # We want to save it afterwards on each platform todo.mark_as_done Async interactions

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Async interactions Abstract interface Notiﬁcations Aspect Oriented Programming

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class Todo def self.saver=(saver) @saver = saver end ! def mark_as_done self.done = true self.class.saver.save(self) end end Abstract interface

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Abstract interface Todo.saver = TodoSaver.new(DatabaseAdapter.new) todo.mark_as_done ! # or ! Todo.saver = TodoSaver.new(RestAdapter.new) todo.mark_as_done

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Abstract interface +Well deﬁned interaction - Core needs to know about use cases +Useful when use cases on each platform are similar

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Notiﬁcations class Todo include Eventable def mark_as_done self.done = true trigger(:marked_as_done, self) end end

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Notiﬁcations todo.on(:marked_as_done) do |todo| save_to_database(todo) end todo.mark_as_done ! # or ! todo.on(:marked_as_done) do |todo| post_to_api(todo) end todo.mark_as_done

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Notiﬁcations +Core doesn’t need to know use cases - Hard to compose interactions !Beware of memory leaks +Useful when use cases on each platform are a bit different

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AOP class Todo def mark_as_done self.done = true end end

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AOP class DatabaseTodoSaver include AspectOrientedLibraryOfChoice after Todo, :mark_as_done do |todo| save_to_database(todo) end end

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AOP class RestTodoSaver include AspectOrientedLibraryOfChoice after Todo, :mark_as_done do |todo| post_to_service(todo) end end

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AOP +Core is blissfully unaware of surroundings - Platforms need to know about internals !Beware of memory leaks +Useful when use cases on each platform are different

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Cross Platform Gems • Tell sprockets where to look for ﬁles using Opal.append_path • use require as usual (it is translated into Sprockets directive)

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Cross Platform Gems • Use require only in the gem’s entry point • Add all required ﬁles in rubymotion conﬁg block

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Cross Platform Gems It literally takes 20 lines of code http://blog.crossplatformruby.com/universal-ruby-gems-in-20-lines-of-code

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Suggestions 1.Make a folder named as an app 2.Rename app folders to platform names 3.Keep them together with gems 4.Keep each of those in separate repositories 5.Use semantic versioning (if you work in teams) 6.Break Replace rules with better ones

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Is it for everyone? (No but there are many use cases)

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Does it work? (Hell yes!)

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Ruby is alive

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Ruby Is taking over the world… … one platform at a time.

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Want to hear more? twitter.com/mehowte [email protected] ! " github.com/mehowte # Michal Taszycki gunpowderlabs crossplatformruby.com