Maybe apply a function to a module

maybe_apply.ex

defmodule Maybe do
  def apply(mod, fun, args) when is_list(args) do
    with true <- function_exported?(mod, fun, Enum.count(args)) do
      Kernel.apply(mod, fun, args)
    else
      false ->
        "No function exported for #{mod}"
    end
  end

  def apply(mod, fun, args),
    do: Maybe.apply(mod, fun, [args])
end

defmodule ModuleA do
  def say(phrase),
    do: IO.inspect(phrase, label: "ModuleA says: ")
end

defmodule ModuleB do
  def say(phrase),
    do: IO.inspect(phrase, label: "ModuleB says: ")
end

defmodule ModuleC do
end

[ModuleA, ModuleB, ModuleC] |> Enum.map(&(Maybe.apply(&1, :say, ["hello"]))) |> IO.inspect