Basic JavaScript - Record Collection

JavaScript
1

Tell us what’s happening:
Describe your issue in detail here.

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

  }
  return records;

}

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

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Record Collection

Link to the challenge:

2

This doesn’t seem like it should be empty.

3

Tell us what’s happening:
Describe your issue in detail here.
I ended up figuring it out but I am lost on a few factors such as:

  • what does each one of these correlate to in the record collection (records, id, prop, value)

  • First, if the album does not have a tracks property, assign it an empty array. Then add the value as the last item in the album’s tracks array.

(records[id].hasOwnProperty(“tracks”) === false) {
records[id][prop] = ;
}

does that mean prop and tracks are the same thing

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) {
if (value === "") {
    delete records[id][prop];
  } else if (prop !== "tracks" && value !== "") {
    records[id][prop] = value;
  } else if (prop === "tracks" && value !== "") {
    if (records[id].hasOwnProperty("tracks") === false) {
      records[id][prop] = [];
    }
    records[id][prop].push(value);
  }
  return records;

}

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

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Record Collection

Link to the challenge:

4

Look at the else if condition:

else if (prop === "tracks" && value !== "") {

So yes, in this instance, prop is equal to “tracks”.

5

Did you see this part of the instructions?

The updateRecords function takes 4 arguments represented by the following function parameters:

  • records - an object containing several individual albums
  • id - a number representing a specific album in the records object
  • prop - a string representing the name of the album’s property to update
  • value - a string containing the information used to update the album’s property

You said they are with this if condition

6 
 (records[id].hasOwnProperty("tracks") === false) {
      records[id][prop] = [];
}
records[id][prop].push(value);

so does this mean that it is searching the id for the property of tracks and if it doesn’t find it then it would create
tracks: then throw a value in the array at the end?

7

You wrote the code. What did you intend for it to do?

No, it is not searching id for the “property of tracks”. The id is a number. It is checking if the record object associated with the given id has a "tracks" property.