Word count koan

Word.exs

defmodule Words do
  @doc """
    Given a phrase can count the occurrences of each word in that phrase.

    ## Example

      Words.count("olly olly in come free")
      #=> #HashDict<[{"come",1},{"free",1},{"in",1},{"olly",2}]>

  """
  def count(input) do
    input |> String.downcase |> get_words |> count_word_occurances
  end

  defp get_words(input) do 
    Regex.scan(%r/\w+/, input) 
  end

  defp count_word_occurances(words) do
    Enum.reduce words, HashDict.new, function increase_word_count/2
  end

  defp increase_word_count(word,dict) do
    HashDict.update dict, word, 1, &1+1
  end
end