Gain insights into metaprogramming in Elixir. Delve into macros and discover how to elevate your coding skills, creating powerful libraries with concise, efficient code.

_Metaprogramming Elixir by The Pragmatic Programmer_468 x 60 copy.png

elixir.tar.gz

elixir

elixir-testing

elixir-copy

Get introduced to the concept of metaprogramming. Learn how to level up your programming skills by discovering the full potential of the macro system in Elixir. Understand the ins and outs of metaprogramming at a fundamental level and write incredible libraries by doing more with less code.

Metaprogramming in Elixir

> Macros don’t just generate code for the caller, they inject it. 

The place where code is injected is called a __context__. A context is the scope of the caller’s bindings, imports, and aliases. To the caller of a macro, the __context__ is precious. It holds the view of the world, and by immutability, we don’t expect our variables, imports, and aliases to change underneath us.

Elixir macros strike an excellent balance to safeguard our context while allowing explicit access where necessary. Let’s see how to inject code safely and the available tools to reach into the __caller’s context__ when necessary.



Learn how macros are used for code injection.

Introduction

The Language of Macros

Extending Elixir with Metaprogramming

Advanced Compile-Time Code Generation

Code Generation from Git API

How to Test Macros

Create an HTML Domain-Specific Language

With Great Power Comes Great Responsibility (and Fun!)

Code Injection and the Caller’s Context