citrusbyte_flatten.ex

defmodule Citrusbyte do
  @moduledoc """
  This module contains custom Citrusbyte implementations of native functions,
  For fun and profit.

  All unit tests are in the form of doctests.
  """

  @doc """
  Flattens multi dimensional arrays.
  An array consisting of other nested arrays
  will be recursively combined to form a single
  array. The end 'tail' of the array will be added
  to the end of the resulting array, First In First Out.

  ## Examples
      iex> Citrusbyte.flatten([])
      []

      iex> Citrusbyte.flatten([1])
      [1]

      iex> Citrusbyte.flatten([[1,2,[3]],4])
      [1,2,3,4]

      iex> Citrusbyte.flatten([[1,2,[]],4])
      [1,2,4]

      iex> Citrusbyte.flatten([[[1],[2, [3]],[4]],[5]])
      [1,2,3,4,5]
  """
  def flatten([]), do: []

  def flatten([ head | tail ]) do
    flatten(head) ++ flatten(tail)
  end

  def flatten(head), do: [ head ]

end

Find the full elixir project here: https://github.com/jonlunsford/citrusbyte-flatten