How to Start with Elixir? Introduction, Installation, and Practice

9 March 2021

How to Start with Elixir? Introduction, Installation, and Practice

Codescrum has been using this programming language on a couple of projects, but it is still a strange language in the market and still a little unknown, so in this post, we are going to explore Elixir from the beginning and tell you how we work with it.


What is Elixir?


We cannot talk about Elixir without mentioning Erlang, so we will start this post in the eighties when the development of telecommunication services grew, and the companies needed to offer communication services without any interruption, concurrency, or fault tolerance. Ericsson created an Open Telecom Platform (OTP) called Erlang, and then made it Open Source in the nineties, and we used its advantages to develop other languages and tools.


Elixir is built on top of Erlang’s VM, called BEAM which compiles to Erlang’s bytecode. Elixir’s syntax looks like Ruby, so if you have already programmed in Ruby, the syntax will feel familiar. Elixir can use dynamic typing by default, or static typing, using typespecs’ built-in functionality when building critical systems.

In the Elixir ecosystem, we found Phoenix, an MVC web framework. Despite Elixir and Phoenix not being as mature as other languages, like Ruby or Python, or frameworks like Ruby on Rails or Django (which has just had ten years in the market), they can solve concurrency and scalability problems in web services. So we took the opportunity to use it in our web projects.


Introduction to Elixir

First of all, we need to install Elixir and Erlang. We use the asdf tool (yes, like the first four letters on the keyboard), which is a manager version for Elixir, like pyenv for Python or rbenv for Ruby. These are the steps taken for a MacOS installation, using the GIT method over a zsh shell:
  • git clone https://github.com/asdf-vm/asdf.git ~/.asdf — branch v0.8.0
  • echo -e ‘\n. $HOME/.asdf/asdf.sh’ >> ~/.zshrc
  • echo -e ‘\n. $HOME/.asdf/completions/asdf.bash’ >> ~/.zshrc
  • We reload the shell, and then print out the asdf version:
  • asdf — version (which must display something like v0.8.0-c6145d0)
  • If you want to get updates run the asdf update
Cool, we then continue with the installation of Elixir/Erlang. To do this, you will need to read the information in this link about Compatibility between Elixir and Erlang/OTP, which tells you about the dependency versions you must install. asdf allows you to manage several programming languages, so we need to specify which of them we are going to use through plugins:
  • asdf plugin-add erlang
  • asdf plugin-add elixir
  • asdf plugin list
  • asdf list-all elixir (to display all elixir versions available)
  • asdf list-all erlang (to display all erlang versions available)
We will use Elixir 1.9, the last stable version. Let’s install it via asdf, but remember to read the compatibility table mentioned above:
  • asdf install erlang 22.3.4.9 (This step take a while)
  • asdf install elixir 1.9.4
  • Let’s check if the installation was correct:

*asdf list

  • Finally, let’s check our Elixir installed version:


*elixir -v

Now, we are going to create a new Elixir project. To do this, we use the mix tool:
  • mix the new codescrum_elixir
  • cd codescrum_elixir
  • git init
  • mix test

*If everything is going ok, then you will get a message like this:

  • Now, we need to set the Elixir/Erlang versions for this project. In the project folder, execute the following commands:


  • These commands will create the .tool-versions file where we will save the exact versions used in this project.


Now let’s check the structure of the project so far:

Then, let’s add some code to write a hangman game. In the lib folder, we are going to add the code to read a text plain file where we will put the words to guess:

In Elixir, classes or objects concepts don’t exist; we have modules and functions to organize our application, which is all we need. So, in the code above, we have a module called ManageFiles, which contains a function called read_file with one parameter. As you can see, the syntax is very similar to Ruby one. The module starts with an uppercase letter and is usually written in CamelCase style.


As we mentioned before, Elixir uses dynamic typing, so we do not have to declare a variable type. Like Ruby’s symbols, Elixir uses atoms. These are a type of variable where the name is its own value (you can see it as :ok named in the code above). Atoms are immutables, meaning that the same helium atom is a helium atom anywhere in the universe, so the :ok atom is the same in the entire application. In the third line, we also have something called pattern matching. This is the Elixir way to retrieve some particular information from complex data types, such as lists and tuples, and the assignment expression is just the simplest form of pattern matching.


The symbol |> denotes a pipe operator, and it is similar to using pipes in Linux. So in the 4th line, the value of the content variable, goes through the split function located in the String module and splits the string, according to the given parameters and the result, which is a list (linked lists) that is saved in the word_list variable. The 5th line randomly picks out one element of the word_list and returns it (there is no explicit return in Elixir).



It looks cool, but we need to know that this piece of code is working, so we are going to prove this. Let’s execute the Elixir Interactive Shell (iex) to load the code and check what happens. First, run the iex command in your terminal, in the project folder:


This command will open the interactive shell, where you will see this prompt:

Bear in mind that the words.txt file must be in the root directory of the project to be located; otherwise, put in the relative path. The content of this file is just one word per line.



At the iex shell, you can find some help for almost all the modules and operators. For instance, if you want to know more about the pipe operator, then type:

The /2 symbol is called the function Arity, which is the number of arguments a function takes. If a function doesn’t take any argument, then its arity would be /0. Try these expressions in the Interactive shell, and see what happens:

To exit from the iex shell, type System.halt or press CTRL+G or CTRL+\ or press CTRL+C twice.

Another way to prove that our code is the correct one is by doing unit tests. So, let’s code our test. In the test folder, create a mix file (.exs) called manage_files_test.exs. The code is the following:


After defining the test module, we need to tell Elixir which unit test framework is going to be used. In this case, we’ll use ExUnit, which is Elixir’s official one, and shipped with Elixir, so we don’t have to install anything else.

Then, we write our test. In this case, we will use the falsy and truthy values, where the atoms nil and false are treated as falsy values, and everything else is treated as a truthy value. So, we can validate whether the read_file function returns something by using short-circuiting logical boolean operators. We could also use the boolean data type only:

Now, we can run the test:

And, if everything is OK, we have got an output like this:

Now, in the hangman_game.ex file, we will put the logic of the game. Let’s start with this piece of code:

ManageGrid is a module to create, paint (print out on screen), and fill the board. You can see the complete code on the Github repository. We have seen the ManageFiles module before, and we use it to get a word to guess. Then we call the play/2 function by passing two parameters: the board and the word to guess (Arity two):

Here we have an Elixir data structure called struct. This type of structure allows us to save information during the execution of the entire application. The main difference with maps is immutability, i.e. we can predefine some fields. In our case, this structure stores the following information:

In another file, this struct is called guess.ex, which contains the module called HangMan.Guess with the fields guess_word initialized in null and attempts initialized in 6.


In the play function, we also have the while function, which is a recursive function to control the game’s flow. In Elixir, there is not the while loop that we know in Python or Ruby, as it uses recursive functions:


As you will notice, the name of the function can be changed for whatever you want to. We use that name just for convention. The function is called recursively until the base condition is accomplished. In this case, the base condition is when the first parameter is zero; the rest of the parameters do not matter. The base case then returns the :ok atom to indicate that everything is correct. The entire code can be found on the Github repository.

Finally, let’s run the game:

And you have got something like this:

What we use Elixir for

A Codescrum project related to Elixir was built for an asbestos removal company whose solution had three components: an API service, a frontend in ReactJS, and a mobile application. The API service was made in Elixir using the Phoenix web framework and a GraphQL implementation by using Absinthe, the GraphQL toolkit for Elixir.


Resources to learn Elixir

Here are some tutorials and courses to get you started with Elixir and its web framework Phoenix:


GitHub repository. The code of the hangman project described above has been made available in the following repository: https://github.com/edycop/elixir_hangman_game


If you have doubts about Elixir, don’t hesitate to reach out to our team! We’re always happy to hear from you, consult you, and help with any questions for Free!



Thank you for reading!

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Self-Supervised Learning at Scale World models typically learn in a self-supervised or unsupervised manner. Instead of relying on labelled datasets, they learn by: Predicting future states from past observations Filling in missing sensory information Learning latent representations from raw data such as video, images, or sensor streams This mirrors biological learning: humans and animals acquire vast amounts of knowledge simply by observing the world, not by receiving explicit labels. Core Components of a World Model A practical world model architecture usually consists of three key elements: 1. Perception Module Encodes raw sensory inputs (e.g. images, video, proprioception) into a compact latent representation. 2. Dynamics Model Learns how the latent state evolves over time, capturing causality and temporal structure. 3. Planning or Control Module Uses the learned model to simulate future trajectories and select actions that optimise a goal. This separation allows the system to think before it acts, dramatically improving efficiency and safety. Practical Applications of World Models World models are particularly valuable in domains where real-world experimentation is expensive, slow, or dangerous. Robotics  Robots equipped with world models can predict the physical consequences of their actions, for example, whether grasping one object will destabilise others nearby. Autonomous Vehicles By simulating multiple future driving scenarios internally, world models enable safer planning under uncertainty. Game Playing and Simulated Environments World models allow agents to learn strategies without exhaustive trial-and-error in the real environment. Industrial Automation Factories and warehouses benefit from AI systems that can anticipate failures, optimise workflows, and adapt to changing conditions. In all these cases, the ability to simulate outcomes before acting is a decisive advantage. Open-Source World Model Projects You Should Know The field of world models is still emerging, but several open-source initiatives are already making a significant impact. 1. World Models (Ha & Schmidhuber) One of the earliest and most influential projects, introducing the idea of learning a compressed latent world model using VAEs and RNNs. This work demonstrated that agents could learn effective policies almost entirely inside their own simulated worlds. 2. Dreamer / DreamerV2 / DreamerV3 (DeepMind, open research releases) Dreamer agents learn a latent dynamics model and use it to plan actions in imagination rather than the real environment, achieving strong performance in continuous control tasks. 3. PlaNet A model-based reinforcement learning system that plans directly in latent space, reducing sample complexity. 4. MuZero (Partially Open) While not fully open source, MuZero introduced a powerful concept: learning a dynamics model without explicitly modelling environment rules, combining planning with representation learning. 5. Meta’s JEPA (Joint Embedding Predictive Architectures) Yann LeCun’s preferred paradigm, JEPA focuses on predicting abstract representations rather than raw pixels, forming a key building block for future world models. These projects collectively signal a shift away from brute-force scaling toward structured, model-based intelligence. Are We Seeing Diminishing Returns from LLMs? While LLMs continue to improve, their progress increasingly depends on: More data Larger models Greater computational cost World models offer an alternative path: learning more efficiently by understanding structure rather than memorising patterns. Many researchers believe the future of AI lies in hybrid systems that combine language models with world models that provide grounding, memory, and planning. Why World Models May Be the Next Breakthrough World models address some of the most fundamental weaknesses of current AI systems: They enable common-sense reasoning They support long-term planning They allow safe exploration They reduce dependence on labelled data They bring AI closer to real-world interaction For applications such as robotics, autonomous systems, and embodied AI, world models are not optional; they are essential. Conclusion World models represent a critical evolution in artificial intelligence, moving beyond language-centric systems toward agents that can truly understand, predict, and interact with the world. As Yann LeCun argues, intelligence is not about generating text, but about building internal models of reality. With increasing open-source momentum and growing industry interest, world models are likely to play a central role in the next generation of AI systems. Rather than replacing large language models, they may finally give them what they lack most: a grounded understanding of the world they describe.
The AI Revolution: 25 Essential Tools for Professional Excellence in 2026
by Gonzalo Wangüemert Villalba 20 December 2025
The Artificial Intelligence (AI) landscape at the close of 2025 is defined by unprecedented velocity. We are at the threshold of 2026, a year widely expected to be when many experimental AI features become mandatory professional standards. Even seasoned experts struggle to keep pace with the sheer volume of new models and updates being launched monthly. This accelerated innovation, however, presents monumental opportunities for professionals and businesses to optimise operations, achieve significant efficiency gains, and ultimately boost revenue. This in-depth article, curated in late 2025, highlights 25 pivotal AI tools that are either already dominant or projected to become indispensable for professional excellence in 2026. We’ve focused on foundational models designed for massive scale, alongside powerful wrappers and specialised tools that deliver genuinely transformative value today and will define the next year. 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Domain-Specific Language Models (DSLM): A strong prediction for 2026: the mass adoption of models trained exclusively on narrow domains (e.g., legal, medical, financial data). They offer the precision and reliability essential for highly regulated sectors, surpassing general LLMs. Visual, Video, and Media Production Tools The era of low-quality synthetic content is ending. The market now demands cinematic quality, fidelity, and consistency for marketing and creation. 4. Midjourney : The industry standard for artistic and high-fidelity image generation. Its unparalleled value lies in its aesthetic quality and a highly engaged community that openly shares complex prompts, driving rapid artistic innovation. 5. Nano Banana Pro (Gemini AI): Google’s cutting-edge image generation and editing suite (powered by Gemini 3 Pro). Its anticipated late 2025/early 2026 release is set to disrupt the market by offering 4K output, superior text rendering, and robust character consistency, crucial for professional branding. 6. Veo (Google Video Generation): The imminent successor to previous Google video models. The key expectation for 2026 is that this tool will eliminate time and quality constraints, pushing long-form video generation into the mass-adoption phase for marketing and content houses. 7. Synthesised Avatars (e.g., Aven): Already used for corporate training and e-learning. Its adoption is poised to grow exponentially in 2026, making it the fastest method for generating compliant, multilingual training videos from text scripts alone. Audio, Voice, and Music Workflow AI-generated audio has reached professional-quality standards, improving post-production efficiency and accelerating music creation. 8. Eleven Labs : The undisputed leader in AI voice generation (TTS). Its synthetic voice output is now virtually indistinguishable from human narration, making it the standard for audiobooks and corporate messaging. 9. Submagic : A critical wrapper for content creators. Its Long-Form Clipper feature is revolutionary, automatically analysing a long video and extracting the most engaging moments to create dozens of pre-subtitled, short-form clips (Shorts, Reels). 10. Suno : The tool that creates complete songs (lyrics, melody, instrumentation, and vocals) from a simple text prompt. Its rapid adoption by content creators and indie game developers is starting to reshape the music licensing landscape. 11. Adobe Speech Enhancer : An essential post-production tool. It uses AI to drastically clean and improve poor-quality audio (removing echo and noise) to achieve near-studio quality, a must-have for remote production teams. Development, Automation, and Business Infrastructure AI is now the fundamental infrastructure that enables end-to-end operational automation and accelerated product development. 12. Nvidio : A sophisticated wrapper that automates the full video creation cycle (scripting, voiceover, and visual assembly) based on a simple topic prompt, drastically reducing production time and cost. 13. Horizons (Hostinger) : A no-code/low-code platform that allows users to create functional WebApps and MVPs through conversation with the AI, making rapid prototyping and business idea validation accessible to everyone. 14. Lovable : A more technical, low-code alternative to Horizons, offering greater control for users who need to refine and heavily customise the AI-generated code for specific web application requirements. 15. Cursor : The AI-powered code editor is rapidly becoming the developer standard. It acts as an advanced co-pilot, not only suggesting code but also debugging, explaining, and generating complex frameworks, defining the modern coding workflow. 16. BuildYourStore : A highly specialised tool that automates the creation of an entire e-commerce business. It designs the Shopify store, generates product content, and automatically connects it to a supplier for a ready-to-launch dropshipping model. 17. N8N : A crucial Integration Platform as a Service (IPaaS). This tool is critical to 2026, as it integrates and orchestrates multiple AI models to build robust multi-agent systems for complex automation (e.g., customer service, scheduling, and content publishing). Efficiency, Professional Development, and Data Management Daily productivity is being redefined by AI tools that integrate seamlessly and intuitively into the existing professional workflow. 18. Canva Magic Studio: The AI suite integrated into Canva. Tools like smart presentation creation, background removal, and text-to-image generation are now commonplace, democratising high-quality design across all sectors. 19. Slides AI : An essential productivity tool that instantly transforms any lengthy document, notes, or script into a professionally structured presentation, saving crucial hours in slide creation. 20. Merlin : A simple yet powerful utility that brings LLM functionality to any web tab or YouTube video. It provides instant contextual summaries and Q&A, allowing users to analyse information without disrupting their browsing flow. 21. Hitem 3D : The "ChatGPT for 3D." It generates complete, textured 3D models from text or 2D images. This capability is rapidly accelerating prototyping, game development, and the creation of digital assets. 22. Google Earth Studio : Utilises AI-constructed 3D models of the world to create cinematic videos and timelapses. Essential for professionals who need high-quality aerial footage without the cost and logistics of using a physical drone. 23. Fireflies : A vital tool for enterprise efficiency. It automatically records, transcribes, and generates summaries of all calls and meetings, ensuring accountability, compliance, and easily searchable knowledge transfer within teams. 24. Google AI Studio (Stream Functionality): A cutting-edge feature where the AI observes the user's screen in real-time to offer procedural guidance. It serves as an intelligent assistant, guiding users through complex software tasks and reducing the need for traditional training. 25. The Next-Gen Personalised Learning AI (Concept): The most critical tool for future-proofing. This agent monitors a professional's performance, identifies knowledge gaps, and autonomously generates custom learning modules and projects for continuous, accelerated reskilling in an ever-changing market. Staying disconnected from this progress, even for six months, can create a significant professional lag. AI is not a trend to be resisted; it is the present and the future, and mastering these tools is fast becoming a requirement for professional excellence.