Code analysis of Basic JavaScript: Record Collection

JavaScript
1

Tell us what’s happening:
Hello,
I need someone to ex[lain me why if I run my code I fail this test:

// running tests
After updateRecords(2468, “tracks”, “Free”), tracks should have “1999” as the first element.
// tests completed

All other test may have been fine but on this one it looks like the tracks array has lost its first entry…

thank you

Your code so far


// Setup
var collection = {
2548: {
  album: "Slippery When Wet",
  artist: "Bon Jovi",
  tracks: [
    "Let It Rock",
    "You Give Love a Bad Name"
  ]
},
2468: {
  album: "1999",
  artist: "Prince",
  tracks: [
    "1999",
    "Little Red Corvette"
  ]
},
1245: {
  artist: "Robert Palmer",
  tracks: [ ]
},
5439: {
  album: "ABBA Gold"
}
};

// Only change code below this line
function updateRecords(id, prop, value) {

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

else if (collection.hasOwnProperty("tracks") && prop === "tracks"){
collection[id][prop].push(value);
}

else if (prop === "tracks"){
collection[id][prop]=[];
collection[id][prop].push(value);
}

else {
collection [id][prop]=value;
}

return collection;
}

updateRecords(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/81.0.4044.138 Safari/537.36.

Challenge: Record Collection

Link to the challenge:

2

this is always false. Can you see why?

3

Hi,

because it should be
collection[id].hasOwnProperty(“tracks”)
And now it works!!!
I thought about it but from the specific lesson on hasOwnProperty I did not get the right clue.

P.S. this is the second time you promptly reply and help me. Do you work for FCC or you are just a code angel?

4

Not many work for freecodecamp, most people that you see around, from the mod team to writers and contributors, they are all volunteers.

5

Even more appreciated. Thank you.