Record Collection created by spences10 - https://repl.it/E0hi/0

Record Collection.js

// 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[id].hasOwnProperty(prop)) {
            collection[id][prop] = []; //Create a property with empty array
            collection[id][prop].push(value); //Append a value into the array 
        } else {
            collection[id][prop].push(value); //Append a value into the exist property array
        }
    } else if (value === "") {
        delete collection[id][prop];
    }
    return collection;
}

// Alter values below to test your code

console.log(updateRecords(5439, "artist", "ABBA"));

// console.log(collection);

// tests
// After updateRecords(5439, "artist", "ABBA"), artist should be "ABBA"
// After updateRecords(5439, "tracks", "Take a Chance on Me"), tracks should have "Take a Chance on Me" as the last element.
// After updateRecords(2548, "artist", ""), artist should not be set
// After updateRecords(1245, "tracks", "Addicted to Love"), tracks should have "Addicted to Love" as the last element.
// After updateRecords(2468, "tracks", "Free"), tracks should have "1999" as the first element.
// After updateRecords(2548, "tracks", ""), tracks should not be set

This is my FCC solution to the Record Collection here:

You are given a JSON object representing a part of your musical album collection. Each album has several properties and a unique id number as its key. Not all albums have complete information.

Write a function which takes an album's id (like 2548), a property prop (like "artist" or "tracks"), and a value (like "Addicted to Love") to modify the data in this collection.

If prop isn't "tracks" and value isn't empty (""), update or set the value for that record album's property.

Your function must always return the entire collection object.

There are several rules for handling incomplete data:

If prop is "tracks" but the album doesn't have a "tracks" property, create an empty array before adding the new value to the album's corresponding property.

If prop is "tracks" and value isn't empty (""), push the value onto the end of the album's existing tracks array.

If value is empty (""), delete the given prop property from the album.

Hints
Use bracket notation when accessing object properties with variables.

Push is an array method you can read about on Mozilla Developer Network.

You may refer back to Manipulating Complex Objects Introducing JavaScript Object Notation (JSON) for a refresher.