Small linked task, that can run on the multicore processor, and save a state inside Map like key-value store in Elixir

process.ex

defmodule Project do
  @moduledoc """
  This module includes example code of the Elixir linked tasks based on the Elixir linked processes.
  """
  
  @doc """
  Create new task.
  
  Returns `{:ok, pid}`
  
  ## Examples
  
      iex> {:ok, pid} = Project.start_link
      {:ok, #PID<0.139.0>}
      iex> send pid, {:put, :message, "Hello World"}
      {:put, :message, "Hello World"}
      iex> send pid, {:get, :message, self()}
      {:get, :message, #PID<0.137.0>}
      iex> flush
      "Hello World"
      :ok
      
  """
  def start_link do
    Task.start_link(fn ->
      loop(%{})
    end)
  end

  defp loop(map) do
    receive do
      {:get, key, caller} ->
        send caller, Map.get(map, key)
        loop(map)
      {:put, key, value} ->
        loop(Map.put(map, key, value))
    end
  end
end