Elixir Macros

Macros are a core Elixir differentiator. Use them carefully to generate code only when ordinary functions are not enough.

Quoted code

quote do: 1 + 2

Unquote

Unquote injects values into quoted expressions and is the bridge between data and generated code.

Metaprogramming basics

Macros run at compile time, so they can add domain-specific syntax, validation, or boilerplate reduction.

Practice

  1. Write one quoted expression.
  2. Explain the difference between a macro and a function.
  3. Write one note about why macros should stay small and targeted.