iex_helper.ex

defmodule IexHelpers do
  def search_fn(name) do
    :code.all_loaded()
    |> Enum.filter(fn {mod, _} -> "#{mod}" =~ ~r{^[A-Z]} end)
    |> Enum.map(fn {mod, _} -> mod end)
    |> Enum.each(fn mod -> 
      mod.__info__(:functions)
      |> Enum.each(fn {fun_name, arity} -> 
        if fun_name == name do
          IO.puts "#{mod}.#{fun_name}/#{arity}"
        end
      end)
    end)
  end
end