Simulates Variadic functions in Elixir (i.e functions with an unknown number of arguments)

Arguments will named arg1, arg2....argN where N is @max_arity.

Uninitialized arguments are set to :no_args_at_this_position

example

Example:

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-no_args_at_this_position

Pass 3 arguments (note arg4 is :no_args_at_this_position):

iex> MyTestModule.test_function(1, 2, :hello)
{1, 2, :hello, :no_args_at_this_position, 3, [1, 2, :hello]}

pass-10-arguments

Pass 10 arguments:

iex> MyTestModule.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

Show binding:

iex> MyTestModule.other_function(777, 888, 999)
{777, 888, 6, [arity: 3, arguments: [777, 888, 999]]}

helper-functions

Helper functions:

get_arity/1     # Returns the number of valid (set) arguments
args_to_list/1  # Returns a list of valid (set) arguments