Basic JavaScript - Record Collection

JavaScript
21

Where is the 1 coming from?

22

Откуда взялся 1? this is selecting the album ID index of a specific album,
Что такое records[2468] ? this is the selection of a specific album by ID

23

You don’t need to use the 1. Where did the 1 come from?

By that specific id, yeah. How would you get at whatever album is corresponds to the argument id?

25

id[1] that’s what I think

26

I think that this example deserves to be divided into dozens of lines; it would be impossible to give more examples; it would be impossible to understand otherwise; why and how to compare there are a bunch of arguments, I don’t understand how it works.

27

There is no 1? Where are you getting the 1 from?

I’m honestly so confused. There is no 1. Only id

records[2468] gets the album with id number 2468. I’m asking how I would get at whatever album corresponds to the id number was passed into the argument for id.

I’m trying to get you to what the arguments do together.

28

Здесь нет 1? Откуда вы взяли 1? I select ID by index
by the index specified in the argument

29

There is no 1. Stop using 1.

Please show the syntax for using id to get an album from the records.

30

if we take the first condition if (value === “”) {
delete records[id][prop]; here the question has already arisen, if the values are empty, why delete delete records[id][prop] if the values are empty? There’s nothing there

31

Пожалуйста, покажите синтаксис использования id для получения альбома из записей.
records[id] As far as I understand it will show all entries with id

32

There we go. This is an important first piece of knowledge.

  • If value is an empty string, delete the given prop property from the album.
  • If prop isn’t tracks and value isn’t an empty string, assign the value to that album’s prop.
  • If prop is tracks and value isn’t an empty string, you need to update the album’s tracks array. 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.

Everywhere it says here ‘the album’, it’s talking about records[id].

So for the first part I quoted, you need to delete the property from records[id]. So your code for this part must have records[id] and prop.

33

this i delete records[id][prop]

34

вам необходимо обновить tracks массив альбома. Во-первых, если у альбома нет tracks свойства, присвойте ему пустой массив. Затем добавьте value в качестве последнего элемента tracks массива альбома.
here it also becomes unclear to me

35

What’s your current code?

36

Again, I can’t understand this code, it doesn’t fit in my head, it’s very complex, it’s easier to copy it than to rack my brain like that)))

37

I recommend against copying the answer.

Can you show me what your code looks like right now?

This sort of thing is exactly what’s hard about professional programming. The job is all about wracking your brain.

38 
// 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;
39

This is looking pretty good.

// 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 !== "") {
    // Update tracks property 
  }
  return records;
}

Let me write the logic for updating the tracks property a little bit differently.

The tracks property is special because it’s an array that might already have other stuff in it.

  1. make sure that if the tracks array doesn’t exist, you create it first as an empty array

  2. add the new tracks value at the end of the tracks array

40

if(records[id] !== “tracks”){
records[id].push(“tracks”)
}
I see it like this

41

You mixed the two parts together. Let’s look at just the first part.

Can you do this?