"After updateRecords(2468, "tracks", "Free"), tracks should have "1999" as the first element." still failing even with output correct.

Challenge Record Collection has an issue. User Agent is: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36. Please describe how to reproduce this issue, and include links to screenshots if possible.

My code:

// 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": [ 
        "1999", 
        "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 (prop !== "tracks" && value !== "") {
        collection[id][prop] = value;
    } else if (prop == "tracks" && value !== "") {
        if (!collection.hasOwnProperty("tracks")) { // moved from outside loop
            collection[id]["tracks"] = [];
            collection[id][prop].push(value);
        } else {
          collection[id][prop].push(value);
        }

    } else { // removed (value === "")
        delete collection[id][prop];
    }

  return collection;
}

// Alter values below to test your code
updateRecords(5439, "artist", "ABBA");

[BeetleJuice-TO]

else if (prop == “tracks” && value !== “”) { // you said in this line my prop= “tracks” then let go inside the if if (!collection.hasOwnProperty(“tracks”)) { // then you said if “tracks” does not inside collection but with wrong syntax you should write if(!collection[id].hasOwnProperty(“tracks”)) collection[id][“tracks”] = []; collection[id][prop].push(value);

but totally you think wrong somewhere because if your value = null, you have to delete the item inside the object, so your first statement should be if(value = “”) {delete collection[id][prop];

[svmarinez]

@Xelepam ! is the logical NOT operator. In this context, it would be the same as saying if the ID of the collection does not have the property “tracks” in human speak.