Basic JavaScript - Record Collection

JavaScript
1

Tell us what’s happening:

To access the value of a key in this object, you will use bracket notation: records[id][prop] . dont understand this statement

for example
if (value === “”) {
delete records[id][prop];
wouldnt you just use record[prop] in this case why add the [id]

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;
}if (value === "") {
    delete records[id][prop];

hello guys,kind of a dumb question but why would you use records[id][prop]; and not records[prop], 
i saw this on tips [To access the value of a key in this object, you will use bracket notation: records[id][prop]. having a hard time understanding this please help

updateRecords(recordCollection, 5439, 'artist', 'ABBA');
2

You appear to have created this post without editing the template. Please edit your post to Tell us what’s happening in your own words.

3

Let’s say that id is 2548.

What does record[id] return?

If you wanted to know the artist for this id, how would you access that with JS?

4

thank you, made sense after a while need more grinding

1 Like
5

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