Pattern

    <.switch
  class="switch"
  controlled
  checked={@checked}
  on_checked_change="patterns_checked"
>
  <:label>Enable</:label>
</.switch>

  

    def mount(_params, _session, socket) do
  {:ok, assign(socket, :checked, false)}
end

def handle_event("patterns_checked", %{"checked" => checked}, socket) do
  {:noreply, assign(socket, :checked, checked == true or checked == "true")}
end