JXA script to find songs with incorrect sentence case

incorrect-sentence-case.js

const lowercaseWords = ['a', 'an', 'and', 'at', 'but', 'by', 'for', 'in', 'nor', 'of', 'on', 'or', 'so', 'the', 'to', 'with']
                       .map(word => ` ${word.toLowerCase().replace(/(^| )(\w)/g, s => s.toUpperCase())} `).join('|')

const iTunes = Application('iTunes'),
      selection = iTunes.selection()

let songsToFix = []
selection.forEach((song) => {
  const newName = song.name(),
        newAlbum = song.album(),
        newArtist = song.artist()
  if (`${newName}${newAlbum}`.match(new RegExp(`^[0-9A-Z].*(${lowercaseWords})`))) {
    songsToFix.push([newArtist, newAlbum])
  }
})
const albumsToFix = [...new Set(songsToFix.map(o => JSON.stringify(o)))].map(s => JSON.parse(s))

const destinationPlaylist = iTunes.sources[0].userPlaylists.whose({name: {_equals: 'Playlist'}})

albumsToFix.forEach((album) => {
  const songs = iTunes.playlists.whose({name: 'Library'})[0].tracks
                                .whose({artist: {_equals: album[0]}})
                                .whose({album: {_equals: album[1]}})
  // songs.forEach((song) => {
  //   song.duplicate({to: destinationPlaylist[0]})
  // })

  for (let i=0; i<songs.length; i++) {
    songs[i].duplicate({to: destinationPlaylist[0]})
  }
})