Macros in Elixir allow you to extend the language by defining code that generates other code at compile time. Use macros to create reusable abstractions and enhance your DSL.

Macros are a powerful feature in Elixir that enables developers to extend the language and create domain-specific languages (DSLs) by generating code at compile time. Unlike functions, which operate on values at runtime, macros operate on the abstract syntax tree (AST) of the code, allowing you to manipulate and transform code before it is executed. To define a macro, use the defmacro keyword, and ensure that the macro receives its input in the form of an AST. Inside the macro, you can perform transformations or generate new code using Elixir's metaprogramming capabilities. For example, you might create a macro that simplifies repetitive code patterns or enforces certain conventions across your project. When using macros, it's essential to understand the implications of code generation, as complex macros can lead to code that is harder to read and maintain. Therefore, use macros judiciously and document their behavior thoroughly to aid other developers. Additionally, macros are beneficial for creating reusable abstractions that encapsulate logic or behaviors that are common in your application. By leveraging macros effectively, you can enhance your Elixir projects with powerful abstractions that streamline development and improve code quality.