metaprogramming.ex

defmodule MapToFunction do
  defmacro functionalize(map) do
    map |> Enum.map(fn {key, val} ->
      quote do: def unquote(key)(), do: unquote(val)
    end)
  end
end

defmodule Digits do
  import MapToFunction

  functionalize [
    one: 1, two: 2, three: 3,
    four: 4, five: 5, six: 6,
    seven: 7, eight: 8, nine: 9
  ]
end

Digits.five # => 5