Contents

defmodule FlattenArray do
  @doc """
    Accept a list and return the list flattened without nil values.

    ## Examples

      iex> FlattenArray.flatten([1, [2], 3, nil])
      [1,2,3]

      iex> FlattenArray.flatten([nil, nil])
      []

  """

  @spec flatten(list) :: list
  def flatten(list) do
    do_flatten(list, [])
  end

  defp do_flatten([head | tail], flattened) when is_list(head) do
    do_flatten(head, do_flatten(tail, flattened))
  end

  defp do_flatten([nil | tail], flattened) do
    do_flatten(tail, flattened)
  end

  defp do_flatten([head | tail], flattened) do
    [head | do_flatten(tail, flattened)]
  end

  defp do_flatten([], flattened) do
    flattened
  end
end

Version data entries

396 entries across 396 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.179	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.178	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.177	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.176	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.175	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.174	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.173	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.172	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.171	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.170	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.169	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.167	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.166	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.165	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.164	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.163	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.162	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.161	tracks/elixir/exercises/flatten-array/example.exs
trackler-2.2.1.160	tracks/elixir/exercises/flatten-array/example.exs