# Learning Elixir: Module Attributes **URL:** \ **Category:** Blog Posts\ **Tags:** learning-elixir, blogs-by-abreujp\ **Created:** [August 8, 2026, 10:34am UTC](https://forum.elixirforum.com/t/learning-elixir-module-attributes/76293 "2026-08-08T10:34:35Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![abreujp](https://forum.elixirforum.com/user_avatar/forum.elixirforum.com/abreujp/32/37856_2.png) [@abreujp](https://forum.elixirforum.com/u/abreujp)\ **Post date:** [August 8, 2026, 10:34am UTC](https://forum.elixirforum.com/t/learning-elixir-module-attributes/76293/1 "2026-08-08T10:34:35Z")
### I’ve published a new article in my Elixir learning series on dev.to exploring module attributes - the compile-time annotations and constants that describe and configure our modules. The article covers: - The three roles of module attributes: annotations, temporary storage, and compile-time constants - Setting and reading attributes, and how compile time differs from runtime - Using attributes as constants, including inside patterns and guards - Precomputing values at compile time and exposing them through functions - Documenting modules and functions with @moduledoc and @doc - Describing function contracts with @spec and typespecs - Defining custom types with @type, @typep, and @opaque - The @vsn, @derive, @behaviour, and @impl attributes - Registering custom attributes with Module.register\_attribute/3 and accumulating values across the module - Practical guidelines for when to reach for an attribute instead of a plain function With complete working examples you can copy into IEx, you’ll learn how module attributes become the glue between documentation, configuration, and compile-time behavior - and how they shape the Elixir code you read every day. Check it out: ### > **[Learning Elixir: Module Attributes](https://dev.to/abreujp/learning-elixir-module-attributes-2ind)** > > I like to think of module attributes as the sticky notes I stick on the drawers of my toolbox. Each...