no-react3.ex

defmodule NoReactWeb.StatefulComponentLive do
  use Phoenix.LiveView

  def render(assigns) do
    ~L"""
    <div>
      Seconds <%= @seconds %>
    </div>
    """
  end

  def mount(_session, socket) do
    if connected?(socket), do: :timer.send_interval(1000, self(), :change)

    {:ok, assign(socket, seconds: 1)}
  end

  def handle_info(:change, socket) do
    {:noreply, assign(socket, seconds: socket.assigns.seconds + 1)}
  end
end