record-collection.js

// Setup
const recordCollection = {
  2548: {
    albumTitle: 'Slippery When Wet',
    artist: 'Bon Jovi',
    tracks: ['Let It Rock', 'You Give Love a Bad Name']
  },
  2468: {
    albumTitle: '1999',
    artist: 'Prince',
    tracks: ['1999', 'Little Red Corvette']
  },
  1245: {
    artist: 'Robert Palmer',
    tracks: []
  },
  5439: {
    albumTitle: 'ABBA Gold'
  }
};

// Only change code below this line
function updateRecords(records, id, prop, value) {
  const record = records[id];

  if (value === ''){
    delete record[prop];
  }
  else {
    if (prop === 'tracks' && record.hasOwnProperty("tracks")===false){
      record.tracks = [];
    }
    if(prop === 'tracks' && value !== "")
    {
      record.tracks.push(value);
     }
    if (prop !== "tracks" && value !='')
    {
      record[prop] = value;
    }
  }

 return records;
}

updateRecords(recordCollection, 5439, 'artist', 'ABBA');