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February 2026

Elixir Programming Language ↗

project

elixir-lang.org · 2012

Functional language built on the BEAM that adds modern ergonomics (macros, protocols, mix tooling) without sacrificing Erlang’s runtime guarantees
Processes are the unit of isolation and concurrency — each is a lightweight actor with its own heap, communicating only through message passing
The language design enforces the “let it crash” philosophy by making processes cheap and supervision trees idiomatic

The BEAM Book ↗

project

GitHub · 2017

Deep dive into BEAM virtual machine internals: schedulers, memory management, garbage collection, and the process model
Explains how the BEAM achieves soft real-time properties through preemptive scheduling based on reduction counts, not time slices
Essential reference for understanding why BEAM processes are cheap (< 1KB initial heap) and how the VM enables millions of concurrent processes