Basic JavaScript - Record Collection

JavaScript
1

Tell us what’s happening:
Describe your issue in detail here.
I don’t understand where the “records” is coming from.

Your code so far

// 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) {
  return records;
}

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

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Record Collection

Link to the challenge:

3

I dont understand the solution, nor the explanations coming with it.

function updateRecords(records, id, prop, value) {
if (prop !== “tracks” && value !== “”) {
records[id][prop] = value;
} else if (prop === “tracks” && value !== “” && records[id].hasOwnProperty(“tracks”) === false) {
records[id][prop] = [value];
} else if (prop === “tracks” && value !== “”) {
records[id][prop].push(value);
} else if (value === “”) {
delete records[id][prop];
}
return records;
}

5

No i did not i am stuck

7

I am not able to solve it at all. I don’t understand why put value !== “” for * If prop is tracks but the album doesn’t have a tracks property, create an empty array and add value to it.

8

You can delete this post, I’ll get answers from elsewhere. Thanks Randell!