function selectChanged() {
    const sortValue = document.getElementById('sort-select').value
    const $films = [...document.querySelectorAll('.film')]
    location.hash = sortValue
    $films.sort((a, b) => {
        const aVal = a.dataset[sortValue]
        const bVal = b.dataset[sortValue]
        return aVal < bVal ? -1 : 1
    })
    document.getElementById('films').innerHTML = ''
    $films.forEach($film => {
        document.getElementById('films').appendChild($film)
    })
}

document.getElementById('sort-select').addEventListener('change', selectChanged)

const locationHash = location.hash.replace('#', '')
if (locationHash !== '') {
    document.getElementById('sort-select').value = locationHash
    selectChanged()
}