Basic JavaScript - Record Collection

I don’t get why this works:
else if (prop == “tracks” && value !== “” ) {
records[id][push].push(value);
}

and this doesn’t:
else if (prop == “tracks” && value !== “” ) {
records[id].push(value);
}

when the task instructed as:

  • If prop is tracks and value isn’t an empty string, add value to the end of the album’s existing tracks array.
    Isn’t “tracks” resided in [prop]? How does Javascript know where to look value in the property?

    **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) {
if (prop !== "tracks" && value !== "") {
  records[id][prop] = value;
}
else if (prop == "tracks" && records[id].hasOwnProperty("tracks") ==  false) {
  records[id][prop] = [value];
}
else if (prop == "tracks" && value !== "" ) {
  records[id][prop].push(value);
}
else if (value == "") {
  delete records[id][prop];
}
return records;
}

updateRecords(recordCollection, 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/104.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Record Collection

Link to the challenge:

I think you have your question backwards. This one works:

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

And this one doesn’t:

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

The push method only works on arrays. Is the value stored at records[id] and array?

You are right, I swapped. lol
I think I kinda get it now anyway. Thanks.