Array Flatten

flatten.ex

# Elixir is by far one of my Favorite programming languages so I decided to write this Flattener in Elixir.
# It may look similar to Ruby, but it most definitely is not Ruby.

defmodule Flattener do
  def flatten([]), do: []
  # Takes the list head and adds the tail to the end of the list
  # this gets repeated for each nested list inside the list and
  # keeps adding the tail of each list to the end of the flattened list.
  def flatten([h|t]), do: flatten(h) ++ flatten(t)
  def flatten(h), do: [h]
end

# Map of lists to Enumerate over and test.
lists = %{
  first: [[1,2,[3]],4,[5,6,[7]]],
  second: [1,2,[3,[4,5]],6,[7,8,[9]]],
  last: [[[1],2,3,[4,5,6]],7,[8,9,10,[11]]]
}

# Enumerate each list in the Map, Flatten the list, and output to the console.
Enum.each(lists, fn({key, val}) ->
  IO.inspect RC.flatten(val)
end)