Elixir Foundations

Elixir is a functional language that runs on the BEAM virtual machine and is built for concurrency, distribution, and fault tolerance.

What Elixir is

Elixir combines functional programming with practical tooling and excellent interoperability with Erlang libraries.

BEAM runtime

BEAM is the runtime that makes lightweight processes, message passing, and supervision practical at scale.

Common use cases

  • Real-time systems and chat services.
  • Distributed backends and telemetry-heavy services.
  • Web applications with Phoenix and LiveView.

Practice

  1. Explain why Elixir favors concurrency over shared mutable state.
  2. List one production use case for BEAM-based systems.
  3. Write one note about where Elixir fits better than a traditional thread-based service.