What exactly is wrong with my record collection code?

JavaScript
1

Tell us what’s happening:
Hello,
I do not know what is wrong with my code. Nothing is being outputted and I want to understand what exactly happened. When I tried using window.alert to debug, I could not see the popup.

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 (prop === "tracks") {
if (tracks !== " "){
collection[id[prop]].push(value);
} else {
collection[id[prop]].push([tracks]);
collection[id[prop[tracks]]].push(value);
}
}
window.alert (collection);
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/80.0.3987.132 Safari/537.36.

Challenge: Record Collection

Link to the challenge:
https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript/record-collection

2

@RyanHuang06 You have several issues.

Why are you checking if value is a space character in the following line?

if (value === " ") {

In the following line, tracks is not a variable, so your code errors out (see browser console). Even if tracks was a variable, why are you comparing it to a space character?

if (tracks !== " "){

In the following line, your brackets are off. You are doing something similar with the others.

delete collection[id[prop]];
3

Wait, I figured it out. Google was weirding out with Javascript and said my function was undefined. Also, I was trying to compare it to empty, not space.

4

Tell us what’s happening:
google says cannot read property ‘push’ of undefined

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

updateRecords(5439, "tracks", "Take a Chance on Me");

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36.

Challenge: Record Collection

Link to the challenge:

5

You had several syntax problems here.
[id[prop]] is kind of typo. Maybe you mean [id][prop].
next, when the property 'tracks' does not exist, then you can add a new property with dot notation and assign its value to an empty array.

6

yes that is typo thanks.

7