Ruby to Elixir

May 10, 2024

As software development continues to evolve, developers often find themselves exploring new languages and paradigms to enhance their skill set and tackle emerging challenges. One such transition that has garnered attention in recent years is the shift from Ruby to Elixir.

Ruby, known for its elegant syntax and developer-friendly environment, has been a popular choice for web development and other software projects. However, as applications grow in complexity and demand for concurrent, fault-tolerant systems rises, developers are seeking alternatives that offer better scalability and performance (How Discord Scaled Elixir to 5 000 000 Concurrent Users).

Elixir, with its roots in the Erlang ecosystem, has emerged as a compelling option for developers looking to build highly concurrent, distributed systems while maintaining productivity and code readability. Its functional programming paradigm, actor-based concurrency model, and robust tooling make it an attractive choice for modern software development.

In this blog post, we’ll explore the transition from Ruby to Elixir, examining the motivations behind this shift and providing insights, tips, and resources for developers embarking on this journey. Whether you’re a seasoned Rubyist looking to expand your skill set or a newcomer curious about the benefits of Elixir, this post aims to guide you through the transition process and help you harness the full potential of this exciting language.


A comparison of Ruby and Elixir

Ruby and Elixir are both dynamic, expressive programming languages, but they have distinct characteristics and are designed to address different sets of challenges. Let’s take a closer look at each language and compare their features, strengths, and weaknesses.



Features: Ruby is known for its elegant syntax, object-oriented programming model, and developer-friendly environment. It offers powerful metaprogramming capabilities, a rich standard library, and a vibrant community ecosystem.

Strengths: Ruby excels in web development, scripting, and building domain-specific languages (DSLs). Its simplicity and readability make it easy to learn and use, making it a popular choice for startups and small to medium-sized projects.

Weaknesses: While Ruby is well-suited for certain use cases, it can struggle with performance and scalability issues, especially in highly concurrent or distributed systems. Additionally, Ruby’s global interpreter lock (GIL) can limit its ability to fully utilize multi-core processors for parallel processing.



Introduction: Elixir is a dynamic, functional programming language built on the Erlang virtual machine (BEAM). It combines the productivity and elegance of Ruby with the robustness and scalability of Erlang’s concurrency model.

Similarities: Like Ruby, Elixir prioritizes developer happiness and readability. It features a concise, expressive syntax inspired by Ruby, making it easy for Rubyists to transition to Elixir. Additionally, Elixir embraces metaprogramming through its macro system, allowing developers to define custom abstractions and DSLs.

Differences: Where Elixir sets itself apart is in its concurrency model and fault-tolerance mechanisms. Elixir adopts the actor-based concurrency model of Erlang, allowing developers to build highly concurrent, fault-tolerant systems with ease. Additionally, Elixir leverages Erlang’s OTP (Open Telecom Platform) framework for building distributed, fault-tolerant applications.



Syntax: While Ruby and Elixir share some syntactic similarities, they diverge in their approach to concurrency and functional programming. Ruby is primarily object-oriented, whereas Elixir is functional-first, with support for immutable data and pattern matching.

Concurrency models: Ruby relies on threads and processes for concurrency, whereas Elixir uses lightweight processes (actors) and message passing for concurrency, enabling massive scalability and fault tolerance.

Ecosystem Support: Ruby boasts a mature ecosystem with a wide range of libraries, frameworks, and tools for web development, whereas Elixir’s ecosystem is still growing but offers strong support for building distributed, fault-tolerant systems.


In summary, while Ruby and Elixir share some similarities, they cater to different programming paradigms and use cases. Ruby excels in simplicity and developer productivity, while Elixir shines in scalability, fault tolerance, and concurrency. Depending on your project requirements and preferences, either language may be a suitable choice for your next endeavor.


Getting started with Elixir

Elixir is a dynamic, functional programming language built on the Erlang virtual machine (BEAM). It combines the productivity of Ruby with the scalability and fault tolerance of Erlang, making it an attractive choice for building highly concurrent, distributed systems. Let’s explore how to get started with Elixir development.


Overview of Elixir

Elixir is designed for building scalable and fault-tolerant applications that can handle high concurrency. It features a concise, expressive syntax inspired by Ruby, making it easy for Ruby developers to transition to Elixir.

Elixir is a functional-first language, meaning it encourages immutable data structures, pure functions, and declarative programming styles. It also embraces the actor-based concurrency model of Erlang, allowing developers to build highly concurrent, fault-tolerant systems with ease.


To setup and get started with Elixir, see out blog post: Elixir for beginners.


Translating Ruby concepts to Elixir

Ruby and Elixir are both powerful programming languages, but they have different paradigms and conventions. In this chapter, we’ll explore how to translate common Ruby concepts to Elixir’s functional programming paradigm:


Objects and classes

  • In Ruby, objects are instances of classes, and classes define behavior through methods and instance variables. In Elixir, there are no classes or objects in the same sense as Ruby.
  • Instead of classes, Elixir uses modules to encapsulate related functions and data. Modules in Elixir are collections of functions that can be invoked using dot notation.
  • While Elixir does not have classes, it does have structs, which are lightweight data structures with a fixed set of fields. Structs are often used to represent data in Elixir applications, similar to Ruby’s structs or hashes.


Modules and mixins

  • Ruby’s modules serve as namespaces and provide a way to group related methods together. Modules can also be used as mixins to add functionality to classes.
  • In Elixir, modules serve a similar purpose as in Ruby, providing a way to group related functions together. However, Elixir modules are not used for inheritance or mixins.
  • Instead of mixins, Elixir uses protocols and behaviours to achieve similar goals. Protocols allow you to define polymorphic behavior for data types, while behaviours define a set of functions that a module must implement.


Functional Programming patterns

  • Ruby developers transitioning to Elixir will encounter a shift in programming paradigms from object-oriented to functional programming. Functional programming emphasizes immutable data, pure functions, and higher-order functions.
  • Instead of mutating state, Elixir functions operate on immutable data structures, producing new values rather than modifying existing ones. This leads to code that is easier to reason about and test.
  • Elixir encourages the use of higher-order functions, which take functions as arguments and/or return functions as results. This allows for powerful abstractions and composability, similar to Ruby’s blocks and lambdas.


By understanding how to translate Ruby concepts to Elixir’s functional programming paradigm, developers can leverage the strengths of both languages and write expressive, maintainable code that scales with their applications.


Transitioning from Rails to Phoenix

If you’re coming from a Ruby on Rails background, you’ll find many similarities and differences when transitioning to Elixir’s Phoenix framework. In this chapter, we’ll explore the process of transitioning from Rails to Phoenix.


Introduction to Phoenix

  • Phoenix is a web framework for Elixir that shares many similarities with Ruby on Rails. Like Rails, Phoenix follows the MVC (Model-View-Controller) pattern and emphasizes convention over configuration.
  • Phoenix is known for its performance and scalability, thanks to Elixir’s concurrency model and the underlying Erlang VM (BEAM).


Comparison of Rails and Phoenix

  • Rails and Phoenix share many features, such as generators for scaffolding CRUD resources, built-in support for database migrations, and a strong focus on developer productivity.
  • However, there are also differences between the two frameworks. For example, Phoenix uses Elixir’s pattern matching and functional programming paradigms, while Rails follows object-oriented programming principles.


Tips for migrating from Rails to Phoenix

  1. Understand the differences: Familiarize yourself with Elixir’s syntax, functional programming concepts, and the Phoenix framework’s conventions. Take advantage of resources such as guides, tutorials, and documentation.
  2. Start small: Begin by porting over smaller components or features from your Rails application to Phoenix. This allows you to gradually become familiar with Elixir and Phoenix while minimizing the risk of disrupting your existing application.
  3. Leverage Elixir libraries: Elixir’s ecosystem, known as Hex, offers a wide range of libraries and packages for common tasks such as authentication, authorization, and database interaction. Take advantage of these libraries to accelerate your migration process.
  4. Refactor as you go: Use the opportunity of migrating to Phoenix to refactor and improve your codebase. Take advantage of Phoenix’s performance optimizations and concurrency features to build a more scalable and efficient application.
  5. Test thoroughly: Ensure thorough testing of your Phoenix application using Elixir’s built-in testing framework, ExUnit. Write tests to cover both new and existing functionality, and leverage tools like ExUnit’s test fixtures for creating test data.


By understanding the similarities and differences between Rails and Phoenix and following best practices for migration, you can smoothly transition your application from Rails to Phoenix and take advantage of Elixir’s performance, scalability, and concurrency features.


Real-world examples and case studies

Transitioning from Ruby to Elixir is not just a theoretical exercise; many companies and projects have successfully made the switch and are reaping the benefits of Elixir’s performance, scalability, and reliability. Let’s explore some real-world examples and case studies:


Companies transitioning from Ruby to Elixir

  1. Discord: Discord, the popular chat application, migrated a significant portion of its backend infrastructure from Ruby to Elixir. The move allowed Discord to handle its growing user base more efficiently and reduced the need for complex sharding and scaling strategies (Why Discord, Pinterest, Moz and Bleacher Report use Elixir. Case studies).
  2. Bleacher report: Bleacher Report, a sports news website, adopted Elixir and Phoenix for its real-time scoring and updates feature. The switch improved the performance and responsiveness of the application, enabling Bleacher Report to deliver timely updates to its users during live sports events (Why Discord, Pinterest, Moz and Bleacher Report use Elixir. Case studies).
  3. PagerDuty: PagerDuty, a digital operations management platform, uses Elixir for various backend services, including real-time alerting and incident management. The use of Elixir has helped PagerDuty handle high concurrency and deliver reliable, low-latency alerts to its customers (Elixir at PagerDuty).


Web applications built with Elixir and Phoenix

  1. Gigalixir: Gigalixir is a platform-as-a-service (PaaS) provider specifically designed for hosting Elixir and Phoenix applications. The platform leverages Elixir’s concurrency features and Erlang’s fault-tolerance capabilities to provide scalable and reliable hosting solutions for Elixir projects.
  2. FarmBot: FarmBot is an open-source CNC farming machine controlled by software written in Elixir. The FarmBot software stack, built with Elixir and Phoenix, enables users to remotely control and monitor their farm operations, demonstrating the versatility and scalability of Elixir for IoT (Internet of Things) applications.


These examples showcase the diverse range of applications and projects that have successfully adopted Elixir and Phoenix. By transitioning from Ruby to Elixir, companies can benefit from improved performance, scalability, and reliability, enabling them to deliver better experiences to their users and customers.


Challenges and considerations

Transitioning from Ruby to Elixir can be an exciting journey, but it’s essential to be aware of potential challenges and considerations along the way. Let’s discuss some of these challenges and strategies for overcoming them:


Paradigm shift

Challenge: Moving from an object-oriented programming (OOP) paradigm in Ruby to a functional programming (FP) paradigm in Elixir can be challenging for developers accustomed to mutable state and imperative programming.

Strategy: Invest time in understanding fundamental functional programming concepts such as immutability, pattern matching, and recursion. Practice writing code in a functional style to become comfortable with Elixir’s idiomatic approach.


Learning curve

Challenge: Learning a new language and ecosystem like Elixir and Phoenix requires time and effort, especially for developers who are deeply familiar with Ruby and Rails.

Strategy: Take advantage of resources such as tutorials, books, online courses, and community forums to accelerate the learning process. Start with small projects or exercises to gradually build proficiency in Elixir and Phoenix.


Tooling and libraries

Challenge: Elixir’s ecosystem may not be as mature or comprehensive as Ruby’s, particularly concerning third-party libraries and tooling.

Strategy: Leverage core Elixir libraries and community-supported packages to address common development needs. Contribute to open-source projects or create your own libraries to fill gaps in the ecosystem and contribute to its growth.


Debugging and troubleshooting

Challenge: Debugging and troubleshooting issues in Elixir applications may require a different approach compared to Ruby, particularly concerning concurrency and distributed systems.

Strategy: Familiarize yourself with Elixir’s built-in tools for debugging, such as IO.inspect, :observer, and :dbg. Embrace Elixir’s emphasis on fault tolerance and error handling by designing resilient systems that gracefully handle failures.


Community and support

Challenge: The Ruby community is large, vibrant, and well-established, while the Elixir community may be smaller and less familiar to developers.

Strategy: Engage with the Elixir community through forums, meetups, conferences, and online communities like the Elixir Forum and Elixir Slack channels. Seek mentorship from experienced Elixir developers and contribute to open-source projects to connect with others in the community.


By acknowledging these challenges and proactively addressing them, developers can navigate the transition from Ruby to Elixir more effectively. Embrace the opportunity to learn and grow as you explore the rich capabilities of Elixir and its ecosystem.


Resources for learning Elixir

Embarking on a journey from Ruby to Elixir requires access to quality learning resources and opportunities to engage with the Elixir community. Here are some recommended resources to help you get started and deepen your understanding of Elixir.



  • Programming Elixir by Dave Thomas: A comprehensive introduction to Elixir, covering the language syntax, concurrency model, and practical examples.
  • Elixir in Action by Saša Jurić: Dive deeper into Elixir’s features and concepts, including functional programming principles and OTP concurrency patterns.
  • Metaprogramming Elixir by Chris McCord: Explore Elixir’s metaprogramming capabilities and learn how to write expressive and concise code using macros.
  • From Ruby to Elixir: Discover how Elixir transforms programming paradigms, seamlessly integrating your Ruby expertise to delve into its syntax, pattern matching, and innovative process model, culminating in the creation of reliable, high-performance applications.


Tutorials and courses

  • Elixir School: A free online platform offering interactive lessons and exercises to help beginners learn Elixir.
  • The Complete Elixir and Phoenix Bootcamp: A popular course covering Elixir fundamentals, Phoenix web development, and building real-world applications.


Online resources

  • Elixir Forum: An active online community where developers can ask questions, share knowledge, and discuss Elixir-related topics.
  • Elixir Weekly: A curated newsletter featuring the latest Elixir news, tutorials, and articles from around the web.
  • Elixir Documentation: The official Elixir documentation provides comprehensive guides, modules, and functions reference for all aspects of the language.


Community engagement

  • ElixirConf: An annual conference dedicated to Elixir and Erlang technologies, featuring talks, workshops, and networking opportunities.
  • Local Meetups: Join local Elixir meetups or user groups in your area to connect with other developers, share experiences, and learn from each other like Func Prog Sweden.
  • Elixir Slack Channels: Join Elixir-related Slack channels such as #elixir-lang and #elixir-lang-core on the Elixir Slack workspace to interact with community members in real-time.


By leveraging these resources and actively engaging with the Elixir community, developers can accelerate their learning journey and gain proficiency in Elixir programming.



In this blog post, we’ve embarked on a journey from Ruby to Elixir, exploring the motivations, challenges, and opportunities that come with transitioning between programming languages. Let’s recap the key points discussed:

Introduction to the transition: We started by providing a brief overview of why developers might consider transitioning from Ruby to Elixir, highlighting the benefits of Elixir’s functional programming paradigm, concurrency model, and robust ecosystem.

A comparison of Ruby and Elixir: We compared the features, syntax, and ecosystem support of Ruby and Elixir, shedding light on the similarities and differences between the two languages and their respective communities.

Getting started with Elixir: We offered guidance on setting up an Elixir development environment, introducing essential tools and resources for newcomers to the language.

Translating Ruby Concepts to Elixir: We explored how to map common Ruby concepts such as objects, classes, and modules to Elixir’s functional programming paradigm, helping developers bridge the gap between the two languages.

Transitioning from Rails to Phoenix: We introduced Phoenix as a web framework for Elixir and provided insights into migrating from Rails to Phoenix, including comparisons of features, conventions, and workflows.

Real-world examples and case studies: We showcased companies and projects that have successfully transitioned from Ruby to Elixir, highlighting the practical applications and benefits of using Elixir in production environments.

Challenges and considerations: We discussed potential challenges and pitfalls when transitioning from Ruby to Elixir, along with strategies for overcoming obstacles and adapting to the functional programming mindset.

Resources for learning Elixir: We provided a curated list of books, tutorials, courses, and online resources to help developers learn Elixir and engage with the vibrant Elixir community.


In conclusion, transitioning from Ruby to Elixir opens up new possibilities for developers seeking greater scalability, performance, and maintainability in their projects. We encourage developers to explore Elixir further, experiment with its features, and consider it as a viable alternative to Ruby for their future endeavors. With its powerful features, robust ecosystem, and growing community, Elixir holds the promise of transforming the landscape of software development and shaping the future of technology.


Additional resources


Check out the Ada Beat Functional Programming blog for more topics, including functional programming principles, summaries of MeetUps, language specific articles, and much more. Whether you’re interested in functional programming theory or practical application, we have something for everyone.