Record Collection- Help needed

Curriculum Help
1

Tell us what’s happening:
I’m trying to solve the records- javascript challenge.
Acccording to given conditions I’ve added the following code

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

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

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0.

Link to the challenge:

2

Question to point you in the right direction: Is ‘collection’ (currently as it is) editable as an object? Does any parsing need to take place?

And does ‘collectionCopy’ do that parsing for you already?

3

Here is the solution. SPOILER ALERT!!!

// 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) {

  // Conditionals
  if (prop !== "tracks" && value !== "") {
    collectionCopy[id][prop] = value;
  } else if (prop === "tracks" && !collectionCopy[id].tracks) {
    collectionCopy[id][prop] = [ value ];
  } else if (prop === "tracks" && value !== "") {
    collectionCopy[id].tracks.push(value);
  } else if (value === "") {
    delete collectionCopy[id][prop];
  }

  // Set 'collection' equal to your changes.
  collection = collectionCopy;

  return collection;
}

// Alter values below to test your code
updateRecords(5439, "artist", "ABBA");
4 
else if(prop == "tracks" && !collection[id].hasOwnProperty("tracks")) {
    collection[id].prop = [];

Hint: This line reads –

  • If the prop equals ‘tracks’
  • and the collection[id] doesn’t have a prop named ‘tracks’
  • set collection[id].tracks to an empty array.