Metaprogramming Syntax

Question 1

Override hygiene

Answer 1

defmodule Setter do
  defmacro bind_name(string) do
    quote do
      !var(name) = unquote(string)
    end
  end
end

Question 2

spawn process

Answer 2

pid = spawn(fn -> :timer.sleep(4000) end)

Question 3

Define a way to extend a module using Elixir’s common API of use and using

Answer 3

defmodule Assertion do

  defmacro \_\_using\_\_(_options) do
    quote do
      import unquote(\_\_MODULE\_\_)

      def run do
        IO.puts "Running the tests..."
      end
    end
  end
end

defmodule MathTest do
use Assertion
end

Question 4

Examine the final AST created by your macro

Answer 4

Macro.to_string(some_ast)