defmodule MyTestModule do import Variadic ## ## Functions are defined as defv (they will be public) ## defv :test_function do # If arguments needed as a list or need arity then binding() should be the first thing called arguments = args_to_list(binding()) work = arg1 + arg2 {arg1, arg2, arg3, arg4, work, arguments} end defv :other_function do binding = binding() ## Do work x = 1 + 2 + 3 arguments = args_to_list(binding) arity = get_arity(binding) {arg1, arg2, x, [arity: arity, arguments: arguments]} end end 

 Pass 3 arguments (note arg4 is nil): iex(2)> MyModule.test_function(1, 2, :hello) {1, 2, :hello, :no_args_at_this_position, 3, [1, 2, :hello]} Pass 10 arguments: iex(3)> MyModule.test_function(1, 2, :hello, 4, 5, 6, :bye, %{key: 123}, [771,"something"], 10) {1, 2, :hello, 4, 3, [1, 2, :hello, 4, 5, 6, :bye, %{key: 123}, [771, "something"], 10]} Show binding iex(10)> MyModule.other_function(777, 888, 999) {777, 888, 6, [arity: 3, arguments: [777, 888, 999]]}