Count the number of words in the sentence

word_count.ex

defmodule Utils.WordCount do
  @doc """
  Count the number of words in the sentence.
  Words are compared case-insensitively.

  "hello there"
  hello: 5
  friends: 7
  """
  @spec count(String.t()) :: map
  def count(sentence) do
    sentence
    |> String.downcase()
    |> String.split(~R/[^\p{L}\p{N}-]+/u)
    |> Enum.reduce(%{}, fn word, map -> Map.update(map, word, 1, &(&1 + 1)) end)
  end
end