word_counter.ex

defmodule WordCounter do

  def count(sent) do
    sent |> normalize |> find_words |> count_unique |> Enum.sort()
  end
  
  def find_words(sent) do
    Regex.scan(~r/\w+/, sent)
  end

  def normalize(string) do
    String.downcase(string)
  end
  
  def count_unique(words), do: count_unique(HashDict.new, words)
  
  defp count_unique(hash, [head|tail]) do
    #hash = HashDict.update hash, head, 1, fn val -> val + 1 end
    hash = HashDict.update hash, head, 1, &(&1 + 1)
    count_unique hash, tail
  end
  
  defp count_unique(hash, []), do: hash

end



#Usage
#s = "Check out this this sentece sentence and and and and it has some words for counting and passing data from one one one function to another... yay yay, yay."
#WordCounter.count(s)