Как обратиться к элементу в jQuery?

// мок запроса
const rooms = [
{
    number: 514,
    isVacant: true
  },
  {
    number: 515,
    isVacant: false
  },
  {
    number: 516,
    isVacant: true
  },
  {
    number: 0,
    isVacant: true
  }
]
rooms.forEach(room => {
  const $target = $("[data-room-number=" + room.number + "]")
  if ($target && room.isVacant) {
    $target.css("background-color", "green")
  } else {
    $target.css("background-color", "red")
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div data-room-number="514">514</div>
<div data-room-number="515">515</div>
<div data-room-number="516">516</div>