Fifty Shades of Error - Roberto Aloi | Code BEAM Europe

[CodeSync]

Fifty Shades of Error - Roberto Aloi | Code BEAM Europe 2025

Fifty Shades of Error - Roberto Aloi | Code BEAM Europe 2025

This talk was recorded at Code BEAM Europe in November 2025. If you’re curious about our upcoming event, check https://codebebeameurope.com

“assert” is a brand new library for Erlang, designed at WhatsApp, which enhances how Erlang errors and assertions are rendered, making it easier for developers to understand what is wrong when an error occurs.
A drop-in replacement for Erlang/OTP stdlib’s assert macros and inspired by Elixir’s ExUnit library and the Exception behaviour, “assert” includes a structural diffing library and an exception blaming mechanism for Erlang.
In this talk you will learn how the library can help your productivity and how to use it. We will also explore the technical implementation behind “assert”.
“assert” is an example of how BEAM languages can influence each other, driving innovation and improvement across the whole ecosystem.

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