Stuck on the Array part on Record Collection

JavaScript
1

Alright with a change of mindset with my confidence I was able to finally complete all the task quickly except one which is the array part. I am confused about how do you add an array next to the prop. What do you suggest I should do?


// 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) {

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

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

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

2

It probably doesn’t make sense but here’s what I done. I just don’t know how you add a empty array with the value inside it next to the prop.

var emptyArray = [];

emptyArray = value;
    collection[id][prop] += emptyArray;
3

That sort of works. You might find you want to create the empty array, as you have, then push the value onto that (emptyArray.push(value); ), then simply assign the array to the property.

For the record, you may not want to use the += operator there. I don’t think its going to do what you intend. Simply collection[id][prop] = emptyArray;

1 Like