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Learn Elixir

Build fault-tolerant, concurrent systems on the Erlang VM.

Free to start. Built from a single prompt. No credit card.

Elixir is a dynamic, functional language created by José Valim that runs on the BEAM, the virtual machine built for Erlang telecom systems. It inherits lightweight processes that share no memory, message passing, and the OTP toolkit of supervisors that restart crashed parts automatically. That makes it a strong fit for chat, real-time dashboards and other services handling many connections. The syntax is friendly, with pattern matching and a pipe operator for chaining transformations. Phoenix is its main web framework. Learnr builds a personalized Elixir course from one prompt and teaches it through short interactive lessons.

How to learn Elixir, step by step

Install Elixir and explore IEx. Install Elixir, which brings Erlang/OTP with it, and open the interactive shell with iex. Try atoms, tuples, maps and the h helper, which prints documentation for any function right in the shell.
Learn that = is a match, not assignment. Practice destructuring with {:ok, value} = result and see a MatchError when shapes differ. Then write functions with several clauses that match different inputs, which replaces many if and else chains.
Chain transformations with Enum and |>. Rewrite nested calls as pipelines that pass each result into the next function's first argument. Solve small exercises like counting words in a file using File.read, String.split and Enum.frequencies.
Spawn processes and send messages. Use spawn, send and receive to build a tiny counter process. Watch how a crash in one process leaves others running, which is the foundation of the let it crash philosophy.
Wrap state in a GenServer with a supervisor. Rebuild the counter as a GenServer using handle_call and handle_cast, then start it under a Supervisor in a Mix project. Kill it from IEx and watch it restart.
Ship a small Phoenix app. Generate a project with mix phx.new, add an Ecto schema and a LiveView page that updates in real time. A Learnr lesson a day keeps OTP vocabulary fresh while the app grows.

What you'll learn

Use pattern matching in assignments, function heads and case
Transform data with the Enum module and the pipe operator
Spawn processes and pass messages between them
Build a stateful GenServer under a supervisor
Start a Phoenix app with Mix and Ecto

What's inside your Elixir course

A sample path Learnr builds for Elixir. Your real course adapts to your goal and level.

1. IEx, basic types, atoms and tuples
2. Pattern matching and multi-clause functions
3. Lists, maps, Enum and the pipe operator
4. Processes, messages and the actor model
5. OTP: GenServer, supervisors and applications
6. Phoenix, Ecto and LiveView basics

How long does it take to learn Elixir?

Developers with another language can write basic Elixir in 2 to 4 weeks. Getting comfortable with OTP and Phoenix usually takes 2 to 4 months at 5 to 8 hours a week, longer if functional programming is new to you.

What you need before you start

Experience in another programming language and basic command-line use. Knowing how web requests work helps once you reach Phoenix.

Common mistakes to avoid

Writing Elixir like Ruby because the syntax looks similar. Data is immutable, so return new values instead of trying to change existing ones.
Using a GenServer for everything, which creates a bottleneck. Plain functions and modules are enough unless you truly need state or concurrency.
Jumping to Phoenix before understanding processes and OTP, then being lost when something crashes. Learn the BEAM basics first.

How Learnr builds your course

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Tell Learnr you want to learn Elixir, or get as specific as you like.

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Move through bite-sized lessons and interactive practice, earning XP and keeping your streak.

Elixir questions, answered

Do I need to learn Erlang first?

No. Elixir gives you full access to Erlang libraries and the BEAM without writing Erlang. Reading a little Erlang becomes useful later for library docs and error messages.

What is Phoenix LiveView?

LiveView lets you build interactive, real-time pages with server-rendered Elixir code over a WebSocket, so you can write many dynamic features without a separate JavaScript framework.