Solved answer: `defmodule HelloWeb.ThermostatLive do use HelloWeb, :live_view

def render(assigns) do ~H""" Current temperature: <%= @temperature %> °F + """ end

def mount(_params, _session, socket) do # Let's assume a fixed temperature for now temperature = 70 {:ok, assign(socket, :temperature, temperature)} end

def handle_event("inc_temperature", params, socket) do {:noreply, update(socket, :temperature, &(&1 + 1))} end end`