ElixirGame.ex

defmodule ElixirGame do
  @moduledoc """
  Documentation for `ElixirGame`.
  """

  @doc ~S"""
  return the answer to a very important topic
  
  ## Examples

  iex> ElixirGame.answer_the_question("answer to the meaning of life, the universe, and everything")
  42

  """
  def answer_the_question(question) do
    question

    |> replace_whitespace_with_puppies()
    |> every_other_character()
    |> split_string_at_oddly_specific_string_token()
    |> count_puppies()
    |> smash_numbers_together()
    
  end

  @doc ~S"""
  return a string containing every other character from the given string, starting with the first character and discarding the second, etc
  
  def every_other_character(string) do
    ...
  end


  ## Examples

  iex> ElixirGame.every_other_character("This is a sentence")
  "Ti sasnec"

  """
  def every_other_character(string) do
    String.split(string, "")
    |> Enum.drop_every(2)
    |> Enum.join("")
  end

  @doc ~S"""
  return a string where every whitespace character in the original string is replaced by the pupper emoji "🐶"
  
  def replace_whitespace_with_puppies(string) do
    ...
  end

  ## Examples

  iex> ElixirGame.replace_whitespace_with_puppies("Pupper Pupper")
  "Pupper🐶Pupper"

  """
  def replace_whitespace_with_puppies(string) do
    String.replace(string, " ", "🐶")
  end

  @doc ~S"""
  return an array of strings created by splitting the given string at the very specific token string of "nvr"

  def split_string_at_oddly_specific_string_token(string) do
    ...
  end

  ## Examples

  iex> ElixirGame.split_string_at_oddly_specific_string_token("This is a nvr string to split")
  ["This is a ", " string to split"]

  """
  def split_string_at_oddly_specific_string_token(string) do
    String.split(string, "nvr")
  end

  @doc ~S"""
  take an array of strings as input, and return an array of integers that represents the number of puppy emojis in the corresponding string in the input array

  def count_puppies(strings) do
    ...
  end

  ## Examples

  iex> ElixirGame.count_puppies(["Ha🐶🐶y", "D🐶y", "🐶🐶🐶"])
  [2,1,3]

  """
  @puppy_emoji ~r/🐶/
  def count_puppies(list_of_str) do
    list_of_str
    |> Enum.map(&count_emoji/1)
  end

  defp count_emoji(string) do
    @puppy_emoji
    |> Regex.scan(string)
    |> length()
  end

  @doc ~S"""
  take an array of single digit numbers and "smash them together" so that the returned integer is equal to the last number in the array + the second to last number * 10 + the third to last * 100, etc
  (equivalent to if you took the commas out of the array and read the numbers in sequence)

  def smash_numbers_together(number_array) do
    ...
  end

  ## Examples

  iex> ElixirGame.smash_numbers_together([1, 4, 5])
  145
  """
  def smash_numbers_together(number_array) do
    reducer = fn number, running_total ->
      number + running_total * 10
    end

    Enum.reduce(number_array, 0, reducer)
  end
end