solutions.exs

defmodule Solutions do
  @moduledoc false

  @doc """
  "turma de elixir formacao elixir de elixir"
  %{"turma" => 1, "de" => 2, "elixir" => 3, "formacao" => 1}
  """
  def get_words_occurrence(sentence) do
    sentence 
    |> String.split()
    |> Enum.frequencies
  end

  
  @doc """
  [1, 5, 0, 8, 10, 9], 19
  
  [4, 5]
  """
  def get_two_sum_index(integers_list, target) do
    Enum.with_index(integers_list) |>
    Enum.reduce_while(%{}, fn {current_value, index}, acc ->
      to_find = target - current_value
      if Map.has_key?(acc, to_find) and Map.get(acc, to_find) !== index do 
       {:halt, [index, Map.get(acc, to_find)]}
      else
       {:cont, Map.put(acc, current_value, index)}
      end
    end)
  end
end