Bringing Elixir to life

Mix.install([
  {:kino, "~> 0.9.0"},
  {:evision, "~> 0.1.21"},
  {:req, "~> 0.3"}
])

Processes

You might have heard that we can create millions of processes:

for _ <- 1..1_000_000 do
  spawn(fn -> :ok end)
end

Process communicate by sending messages between them:

child =
  spawn(fn ->
    receive do
      {:ping, caller} -> send(caller, :pong)
    end
  end)

send(child, {:ping, self()})

receive do
  :pong -> :it_worked!
end

And Livebook can helps us see how processes communicate between them:

Kino.Process.render_seq_trace(fn ->
  child =
    spawn(fn ->
      receive do
        {:ping, caller} -> send(caller, :pong)
      end
    end)

  send(child, {:ping, self()})

  receive do
    :pong -> :it_worked!
  end
end)

Maybe you want to see how Elixir can perform multiple tasks at once, scaling on both CPU and IO?

Kino.Process.render_seq_trace(fn ->
  1..4
  |> Task.async_stream(
    fn _ -> Process.sleep(Enum.random(100..300)) end,
    max_concurrency: 4
  )
  |> Stream.run()
end)

frame = Kino.Frame.new() |> Kino.render()

for _ <- Stream.interval(1000) do
  Kino.Frame.render(frame, :erlang.memory())
end