Record Collection 1999

JavaScript
1

Tell us what’s happening:

Hi, everyone, I don’t understand why I had that answer : “After updateRecords(2468, “tracks”, “Free”), tracks should have “1999” as the first element.”
because I push the value in collection[id][prop]

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(value ===""){
    delete collection[id][prop]
  }
else {
  if (prop === "tracks"){
 (!collection.hasOwnProperty('tracks'))?
    
      collection[id].tracks = [value]:
      
      collection[id][prop].push(value);
  }
  else {
    collection[id][prop] = value;
  }}
  return collection;
  
}

// Alter values below to test your code
updateRecords(5439, "artist", "ABBA");

Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36.

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

2 
if (prop === "tracks"){
 (!collection.hasOwnProperty('tracks'))?
    
      collection[id].tracks = [value]:
      
      collection[id][prop].push(value);
  }
  else {
    collection[id][prop] = value;
  }}

You’re only doing a push if the tracks prop didn’t exist. Your code replaces the whole tracks value with value if it already exists.

1 Like