Record Collection"Cannot read property 'push' of undefined:"

Record Collection"Cannot read property 'push' of undefined:"
0

#1

Hi, I got the information from the console"Cannot read property ‘push’ of undefined:"
Whats wrong with my code? Could someone help with me?

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"
    }
};
// Keep a copy of the collection for tests
var collectionCopy = JSON.parse(JSON.stringify(collection));

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

  if(prop!="tracks"&&value!=""){
    collectionCopy[id][prop]=value;
  }
  if(value !=='' &&prop == 'tracks'){
    collectionCopy[id][prop].push(value);
    
}
  if(value===""){
    delete collectionCopy[id][prop];
  }
  
  return collection;
}

// Alter values below to test your code
updateRecords(5439, "tracks", "Take a Chance on Me");

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.26 Safari/537.36 Core/1.63.5712.400 QQBrowser/10.2.1957.400.

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


#2

You missed part of the instructions

If prop is “tracks” but the album doesn’t have a “tracks” property, create an empty array before adding the new value to the album’s corresponding property.


#3

Thank you, I got it, i did missed this part of imformation