Who’s in space?

space.exs

#!/usr/bin/env elixir

Mix.install([
  {:httpoison, "~> 1.8"},
  {:jason, "~> 1.3"}
])

defmodule Space do
  def run do
    fetch_data()
    |> Jason.decode!()
    |> extract_people()
    |> Enum.group_by(fn %{"craft" => craft} -> craft end)
    |> report()
  end

  defp fetch_data do
    with {:ok, response} <- HTTPoison.get("http://api.open-notify.org/astros.json") do
      response.body
    end
  end

  defp extract_people(json), do: json["people"]

  defp report(people_by_craft) do
    IO.puts("The people currently in space are:")

    for {craft, people} <- people_by_craft do
      report_craft(craft, people)
    end
  end

  defp report_craft(craft, people) do
    IO.puts("  [#{craft}]:")

    for %{"name" => name} <- people do
      IO.puts("    #{name}")
    end
  end
end

HTTPoison.start()
Space.run()