Record Collection11

Tell us what’s happening:What’s wrong on my code

Your code so far

// Setup
var collection = {
    "2548": {
      "album": "Slippery When Wet",
      "artist": "Bon Jovi",
      "tracks": [ 
        "Let It Rock", 
        "You Give Love a Bad Name" 
    "2468": {
      "album": "1999",
      "artist": "Prince",
      "tracks": [ 
        "Little Red Corvette" 
    "1245": {
      "artist": "Robert Palmer",
      "tracks": [ ]
    "5439": {
      "album": "ABBA Gold"
// Keep a copy of the collection for tests
var collectionCopy = JSON.parse(JSON.stringify(collection));

// Only change code below this line
function updateRecords(id, prop, value) {
 if(!value) {
   delete collection[id][prop];
   return collection;
  if(prop !== "tracks"&& "value") {
    collection[id][prop] = value;
  else {
    if(collection[id].hasOwnProperty("property")) collection[id].tracks = [];
  return collection;

// Alter values below to test your code
updateRecords(2548, "tracks", "");

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Link to the challenge:

1 Like

What do the failing tests say? What questions do you have? What do you not understand?

The failing tests said that can not read property ‘push’ of undefined

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You can’t push to an array that doesn’t exist - some of the albums don’t have a track property, so you will need to create an array first, but without overwriting those that have already items in the array