Starter Phoenix LiveView Course (Pragmatic Studio) (Free)

[alvises]

Fantastic content @mikeclark, thanks!

@Dusty

Elixir wouldn’t let me use socket.assigns.brightness inside a guard clause

You can pattern match the brightness key inside the assigns map. But it’s just a different style of doing the same thing.

def handle_event("up", _, %{assigns: %{brightness: b}}=socket) 
  when b == 100, do: {:noreply, socket}

def handle_event("up", _, socket)
  do: {:noreply, update(socket, :brightness, &(&1 + 10))}

def handle_event("down", _, %{assigns: %{brightness: b}}=socket) 
  when b == 0, do: {:noreply, socket}

def handle_event("down", _, socket)
  do: {:noreply, update(socket, :brightness, &(&1 - 10))}