How to create a dynamic function name using Elixir macro?

Question

I want to create a function names dynamically. I wrote this macro

defmacro generate_dynamic(name) do
  quote do 
    def add_(unquote(name)) do
    end
  end         


        

Answer 1

I did this same sort of thing in a gist to try and mimic Ruby's attr_accessor:

defmodule MacroExp do
  defmacro attr_accessor(atom) do
    getter = String.to_atom("get_#{atom}")
    setter = String.to_atom("set_#{atom}")
    quote do
      def unquote(getter)(data) do
        data |> Map.from_struct |> Map.get(unquote(atom))
      end
      def unquote(setter)(data, value) do
        data |> Map.put(unquote(atom), value)
      end
    end
  end

  defmacro attr_reader(atom) do
    getter = String.to_atom("get_#{atom}")
    quote do
      def unquote(getter)(data) do
        data |> Map.from_struct |> Map.get(unquote(atom))
      end
    end
  end
end


defmodule Calculation do
  import MacroExp
  defstruct first: nil, second: nil, operator: :plus

  attr_accessor :first   # defines set_first/2 and get_first/1
  attr_accessor :second  # defines set_second/2 and get_second/1
  attr_reader :operator  # defines set_operator/2 and get_operator/1

  def result(%Calculation{first: first, second: second, operator: :plus}) do
    first + second
  end
end

https://gist.github.com/rcdilorenzo/77d7a29737de39f0cd84