When Javascript isn't Javascript

Aug 7, 20180 likes63 views

This document discusses using Ruby code in the browser through a Ruby to JavaScript compiler called Opal. Opal allows you to write Ruby code and compile it to JavaScript, enabling the use of Ruby concepts and syntax directly in web applications. Some key points covered include how Opal maps Ruby concepts like self, nil, and truthy values to their JavaScript equivalents, a demo of a calculator application built with Opal, and answers to common questions about whether and how Ruby and JavaScript can interact when using Opal. Benchmarks are also mentioned comparing performance of Ruby code compiled to JS versus interpreting Ruby directly in the browser.

When Javascript
isn't Javascript
Ruby in the Browser

@parasquid
Chief Problem Solver
at Mindvalley

Brendan Eich
Douglas Crockford
Mike Shaver

JavaScript is the
Assembly Language
of the Web

SIMD is coming to
Firefox, V8, and Chakra

JavaScript is so fast now that any
performance impact due to
inefficient code is almost negligible

It begs the question: can I
use JavaScript without
writing JavaScript?

Opal
you can precompile ruby code to js
generated code is JavaScript
concepts are mapped directly to
underlying JavaScript features and
objects when possible

Opal for the
Rubyist
self is compiled to this (and the
runtime properly binds this to the
correct self value)
nil is a JavaScript var (because in
Ruby, nil is an actual object)

Opal for the
Rubyist
"" 0 and [] is truthy
true and false are of the Boolean
class, not TrueClass and FalseClass
strings are immutable (because js
strings are immutable)

FAQA
can you use js inside ruby? yes
can you use ruby inside js? yes
can you access the browser elements
(like the location bar, control the
window, etc)? yes
can I use jQuery? yes

FAQA
is it really ruby? yes (5,122 rubyspec
since 10 June 2015)
so that means you have
method_missing? yes
can I just write ruby without
precompiling it? yes, but it's less
performant

some concepts can be
written more expressively

application logic can easily
be shared between the
client and the server

you get to use a
power operator
http://news.softpedia.com/news/
ecmascript-2016-new-version-of-
the-javascript-language-
released-505625.shtml

You get to approach the same problem in
different ways, which can broaden your
perspective and change the way you think
about programming.

http://rubyist.jaredwhite.com/
2015/01/08/ruby-browser-bliss-use-
opal-and-be-happy-part-1/
http://opalrb.org/docs/guides/
v0.10.1/compiled_ruby.html
http://www.hanselman.com/blog/
JavaScriptIsAssemblyLanguageForThe
WebSematicMarkupIsDeadCleanVsMac
hinecodedHTML.aspx

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This report documents the design and development of an Online Queue Management System tailored specifically for municipal offices in Nepal. Municipal offices, as critical providers of essential public services, face challenges including overcrowded queues, long waiting times, and inefficient service delivery, causing inconvenience to citizens and pressure on municipal staff. The proposed digital platform allows citizens to book queue tokens online for various physical services, facilitating efficient queue management and real-time wait time updates. Beyond queue management, the system includes modules to oversee non-physical developmental programs, such as educational and social welfare initiatives, enabling better participation and progress monitoring. Furthermore, it incorporates a module for monitoring infrastructure development projects, promoting transparency and allowing citizens to report issues and track progress. The system development follows established software engineering methodologies, including requirement analysis, UML-based system design, and iterative testing. Emphasis has been placed on user-friendliness, security, and scalability to meet the diverse needs of municipal offices across Nepal. Implementation of this integrated digital platform will enhance service efficiency, increase transparency, and improve citizen satisfaction, thereby supporting the modernization and digital transformation of public service delivery in Nepal.

Design by Contract - Building Robust Software with Contract-First DevelopmentPar-Tec S.p.A.

In the fast-paced world of software development, code quality and reliability are paramount. This SlideShare deck, presented at PyCon Italia 2025 by Antonio Spadaro, DevOps Engineer at Par-Tec, introduces the “Design by Contract” (DbC) philosophy and demonstrates how a Contract-First Development approach can elevate your projects. Beginning with core DbC principles—preconditions, postconditions, and invariants—these slides define how formal “contracts” between classes and components lead to clearer, more maintainable code. You’ll explore: The fundamental concepts of Design by Contract and why they matter. How to write and enforce interface contracts to catch errors early. Real-world examples showcasing how Contract-First Development improves error handling, documentation, and testability. Practical Python demonstrations using libraries and tools that streamline DbC adoption in your workflow.

Top 11 Fleet Management Software Providers in 2025 (2).pdfTrackobit

The rise of e-commerce has redefined how retailers operate—and reconciliation...Prachi Desai

Generative Artificial Intelligence and its ApplicationsSandeepKS52

The exploration of generative AI begins with an overview of its fundamental concepts, highlighting how these technologies create new content and ideas by learning from existing data. Following this, the focus shifts to the processes involved in training and fine-tuning models, which are essential for enhancing their performance and ensuring they meet specific needs. Finally, the importance of responsible AI practices is emphasized, addressing ethical considerations and the impact of AI on society, which are crucial for developing systems that are not only effective but also beneficial and fair.

14 Years of Developing nCine - An Open Source 2D Game FrameworkAngelo Theodorou