Basic JavaScript - Record Collection

JavaScript
1

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

Your code so far
I don’t know where to start honestly. This whole thing is entirely confusing. Can someone explain how records is connected to the variable recordCollection? What to do in the 2nd question? " * If prop is tracks but the album doesn’t have a tracks property, create an empty array and add value to it." What should I do after else if prop == tracks? I seriously do not want to copy and paste everything with 0 comprehension. I want to learn more in detail. Please someone help?

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

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

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Challenge: Basic JavaScript - Record Collection

Link to the challenge:

2

The function call (the last line) says, in words, "run the function updateRecords with records = recordCollection, id = 5439, prop = 'artist', and value = 'ABBA'.

This doesn’t do what you think. You should see an error in the console. What does that error say?

3

Oh and can I use dot Notation?

4

Dot notation only works with the exact literal property name, not a variable holding the property name.

5

I wrote exactly what the first question asked of me but not sure if I wrote this line correctly “records[id][prop] = value;”. I looked at the hint but never understood how records and recordCollection connect with one another. However, I look at the console and has many errors so not sure what issue could be?

6

Now I understand how records is equal to recordCollection

7

Not quite.

This is an error. What type of thing will prop be? A number? A string?

8

prop has artist and tracks so a string. That means I got put it in quotes?

9

Give it a try. That sounds like good reasoning to me.

10

Okay seems like I made a lot errors and not sure where to start. The console marked everything wrong and not understanding what its asking for.

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

updateRecords(recordCollection, 5439, 'artist', 'ABBA');
console.log(records);
11

This part looks ok to me.

This looks like a problem to me.

What sort of thing is id? Is it an object?

Why are you modifying the variable prop? This function needs to update records.

I am not sure what you intend this line to do?

I don’t think your if condition is quite right. Also, you cannot use dot notation when the property name is stored in a variable.

This should not be in an else clause. The records object must always be returned.

12

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