JXA to add songs to a playlist based on an artist and list of songs

itunes-add-songs.js

const ARTIST = ''
let TRACKS = []

const app = Application('iTunes')
const destinationPlaylist = app.userPlaylists.whose({name: {_equals: ARTIST}})[0]

TRACKS.forEach((name) => {
  const matchedNames = app.playlists.whose({name: 'Library'})[0].tracks
                                    .whose({name: {_equals: name}})

  for (let i = 0; i < matchedNames.length; i++) {
    if (matchedNames[i].artist() === ARTIST) {
      matchedNames[i].duplicate({to: destinationPlaylist})
      TRACKS = TRACKS.filter(n => n !== name)
    }
  }
})

TRACKS