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// Setup
var 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) {
  if (prop !== "tracks" && value) {
    records[id][prop] = value;
  }

  else if (prop === "tracks" && !records[id].tracks) {
    records[id].tracks = [ value ]
  }

  else if (prop === "tracks" && value) {
    records[id].tracks.push(value)
  }

  else if (!value) {
    delete records[id][prop]
  }

  return records;
}

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