Macros are a very common way to do metaprogramming in Elixir. There are many resources that explain what macros are and how to use them (much better than I could): there's the Macro chapter from the "Getting Started" guide on Elixir's website, an awesome series of articles by Saša Jurić, and even a book (Metaprogramming Elixir) by Chris McCord. In this article, I'll assume you are familiar with macros and how they work, and I'll talk about another use case of macros that is rarely examined:...
