Record Collection Detail Explanation

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

  **Your code so far**

// Setup
var 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" && records[id].hasOwnProperty("tracks") === false) {
  records[id][prop] = [value];
}
return records;
}

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

I want to ask, how does “records[id][prop]” works?
I mean, can you explain the parameters, why they can be used at the same time? while in the lesson, the parameter is only one used.

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Challenge: Record Collection

Link to the challenge:

Can you explain why you think you shouldn’t be able to use multiple variables together? records is an object of objects. id describes which sub-object you need to access, and the prop describes which property of that sub-object you need to update.

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