<section id="description">
  <p>Вам предоставляется объект JSON, представляющий часть вашей коллекции музыкальных альбомов. Каждый альбом имеет
    несколько свойств и уникальный идентификационный номер в качестве ключа. Не все альбомы имеют полную информацию.
    </p>
</section>

// 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"
  }
};

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


  return collection;
}

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


index

Коллекция записей

Record Collection

You should not change the <code>collection</code> object's initialization

After <code>updateRecords(5439, "artist", "ABBA")</code>, <code>artist</code> should be <code>"ABBA"</code>

After <code>updateRecords(5439, "tracks", "Take a Chance on Me")</code>, <code>tracks</code> should have <code>"Take a Chance on Me"</code> as the last element.

After <code>updateRecords(2548, "artist", "")</code>, <code>artist</code> should not be set

After <code>updateRecords(1245, "tracks", "Addicted to Love")</code>, <code>tracks</code> should have <code>"Addicted to Love"</code> as the last element.

After <code>updateRecords(2468, "tracks", "Free")</code>, <code>tracks</code> should have <code>"1999"</code> as the first element.

After <code>updateRecords(2548, "tracks", "")</code>, <code>tracks</code> should not be set

After <code>updateRecords(1245, "album", "Riptide")</code>, <code>album</code> should be <code>"Riptide"</code>

javascript-algorithms-and-data-structures

Basic JavaScript

// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  if (value === "") {
    delete collection[id][prop];
  } else if (prop === "tracks") {
    collection[id][prop] = collection[id][prop] || [];
    collection[id][prop].push(value);
  } else {
    collection[id][prop] = value;
  }
  
  return collection;
}

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


// 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"
  }
};

// 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") === false) {
    collection[id][prop] = [value];
  } 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");


// 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"
  }
};

// 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") === false) {
    collection[id][prop] = [value];
  } 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");


// 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"
  }
};

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


  const item = collection[id];

  switch (prop) {
    case "tracks":

      if (!item[prop]) {
        item[prop] = []
      }

      value && item[prop].push(value)

      break;

    default:
      if (value) {
        item[prop] = value;
      }

  }

  if (!value) {
    delete item[prop]
  }


  return collection;
}

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




// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
switch(prop){
  case 'tracks':
  if (!collection[id].hasOwnProperty(prop)){
    collection[id]['tracks'] = [];
  }
  if (value !==""){
    collection[id].tracks.push(value);
  } else{
    delete collection[id]['tracks'];
  }
  break;
  case 'artist':
  if (value===""){
    delete collection[id]['artist'];
  }else{
    collection[id]['artist'] = value;
  }
  break;
  case 'album':
  collection[id]['album'] = value;
  break;
}
  return collection;
}  

// Alter values below to test your code



// 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"
    }
};

// Only change code below this line
function updateRecords(id, prop, value) {
    const record = collection[id];
    if (value){
        if (prop != 'tracks'){
            record[prop] = value;
        } else {
            if (!record.hasOwnProperty(prop)){
                record[prop] = [];
            }
            record[prop].push(value);
        }
    } else {
        delete record[prop];
    }
    return collection;
}

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


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
if (prop != 'tracks' && value != "") {
    collection[id][prop] = value;
} else if (!collection[id].hasOwnProperty(prop)){
 collection[id][prop] = [value];
} 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");


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  if (prop == 'artist'){
    if (value == '') delete collection[id].artist;
    else collection[id].artist = value;
  } 
  if (prop == 'tracks'){
    if (value == '') {delete collection[id].tracks;}
    else {
      if (collection[id].tracks) collection[id].tracks.push(value);
      else {
        var arr = [];
        arr.push(value);
        collection[id].tracks = arr;
      }
    }
  }
  if (prop == 'album'){
    collection[id].album = value;
  }

  return collection;
}

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


// 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"
  }
};

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

  if (prop !== "tracks" && value !== ""){

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

    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");


// 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"
  }
};

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

  if (prop !== "tracks" && value !== "") {

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

    if (!collection[id].hasOwnProperty(prop)) {
      collection[id][prop] = [];
    }

    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");

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


// 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"
  }
};

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

  const album = collection[id];

  if (prop === "tracks") {
    if (value) {
      if (!album.tracks) {
        album.tracks = [];
      }
      album.tracks.push(value)
    }
  }
  else {
    if (value) {
      album[prop] = value;
    }
    else {
      delete album[prop]
    }
  }

  if(!value) {
    delete album[prop]
  }


  return collection;
}

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


// 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"
  }
};

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

  if(value == '') {
    delete collection[id][prop]
  } else {
    if (prop != 'tracks' && value != '') {
      collection[id][prop] = value
    } else if (prop == 'tracks' && collection[id].tracks == undefined) {
      collection[id].tracks = [value]
    } else if (prop == 'tracks' && value != '') {
      collection[id].tracks.push(value)
    }
  }

  return collection;
}

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


// 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"
  }
};

// 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")===false) {
    collection[id][prop] = [value];
  }
  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");


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
if (value == '') {
  delete collection[id][prop]}
  else if (prop != 'tracks' && value != '') {
    collection[id][prop] = value }
else if (prop == 'tracks' && collection[id].tracks == undefined) {
  collection[id].tracks=[value]}
  else if (prop == 'tracks' && value != '') {
    collection[id].tracks.push(value)
  
}

  return collection;
}

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


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
if (value == '') {
  delete collection[id][prop];
}  else if (prop != 'tracks' && value != '') {
    collection[id][prop] = value;
} else if (prop == 'tracks' && collection[id].tracks == undefined) {
  collection[id].tracks=[value];
}  else if (prop == 'tracks' && value != '') {
    collection[id].tracks.push(value);
}
  return collection;
}

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


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  if (id in collection == true) {
    if (prop != "tracks" && value != "") {
      collection[id][prop] = value;
      console.log(collection);    
    } else if (prop == "tracks" && "tracks" in collection[id] != true && value != "") {
      collection[id].tracks = [];
      collection[id].tracks.push(value);
      console.log(collection);
    } else if (prop == "tracks" && value != "") {
      collection[id].tracks.push(value);
      console.log(collection);
    } else if (prop == "tracks" || prop == "artist" && value == "") {
      delete collection[id][prop];
      console.log(collection);
    }
  }
  return collection;
}

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

// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
if (value ==""){
  delete collection[id][prop]
}
else if (prop != 'tracks' && value != ''){
  collection[id][prop]=value
}
else if (prop == 'tracks' && collection[id].tracks == undefined){
  collection[id].tracks = [value]
}
else if (prop == 'tracks' && value != ''){
collection[id].tracks.push(value);
} 
 return collection;
}

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


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  
  if (value == "") {
    delete collection[id][prop];
  }
  else {
    if (prop != "tracks") {
      collection[id][prop] = value;
    }
    else {
      if (!collection[id].hasOwnProperty(prop)) {
        collection[id][prop] = [value];
      }
      else {
        collection[id][prop].push(value);
      }
    }
  }

  return collection;
}

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


// 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"
  }
};

// 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") === false) {
    collection[id][prop] = [value];
  } 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");


// 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"
  }
};

// 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][prop] == undefined){
    collection[id][prop] = new Array;
    collection[id][prop].push(value);
  } 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");


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  if (value == "" && collection[id].hasOwnProperty(prop)) {
    delete collection[id][prop];
  }
  else if (prop === "tracks") {
    if (!collection[id].hasOwnProperty(prop)) {
      collection[id][prop] = [value];
    }
    else {
      collection[id][prop].push(value);
    }
  }
  else {
    collection[id][prop] = value;
  }

  return collection;
}

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


// 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"
  }
};

// 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][prop]){
    collection[id][prop] = [value];
  } 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");


// 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"
  }
};

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

  return collection;
}

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


// 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"
  }
};

// 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") === false) {
    collection[id][prop] = [value];
  }
  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");


// 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"
  }
};

// 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")=== false) {
    collection[id][prop] = [value];
  } 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");


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
if (value === ""){
  delete collection[id][prop];
  } else if(prop === "tracks"){
    collection[id][prop] = collection[id][prop] || [];
    collection[id][prop].push(value);
  } else {
    collection[id][prop]=value;
  }

  return collection;
}

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

// 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"
  }
};

// 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(prop)) {
    collection[id][prop] = [];
    collection[id][prop].push(value);
  }
  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(2468, "tracks", "Free");


// 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"
  }
};

// Only change code below this line
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[id][prop] = collection[id][prop] || [];
    collection[id][prop].push(value);
  } else {
    collection[id][prop] = value;
  }

  return collection;
}

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


// 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"
  }
};

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

  const album = collection[id];
  console.log("collection[id]", collection[id])

  if (prop === "tracks") {
    if (value) {
      if (!album.tracks) {
        album.tracks = [];
      }
      album.tracks.push(value)
    }
  }
  else {
    if (value) {
      album[prop] = value;
    }
    else {
      delete album[prop]
    }
  }

  if(!value) {
    delete album[prop]
  }


  return collection;
}

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


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  if (value === "") {
    delete collection[id][prop];
  } else if (prop === "tracks") {
    collection[id][prop] = collection[id][prop] || [];
    collection[id][prop].push(value);
  } else {
    collection[id][prop] = value;
  }
  return collection;
}

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


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  if (prop != "tracks" && value != "") collection[id][prop] = value;
  else if (!collection[id].hasOwnProperty("tracks")) collection[id][prop] = []
  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");


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  if (prop === "artist" && value !== "") {
    collection[id][prop] = value;
    return collection;
  }
  if (prop === "artist" && value === "") {
    delete collection[id][prop];
    // delete collection[id]["tracks"];
    return collection;
  }
  if (prop === "tracks") {
    if (!collection[id].hasOwnProperty(prop)) {
      collection[id][prop] = [];
      // collection[id][prop].push(value)
    }
      
    if (value !== "") {
      collection[id][prop].push(value);
      return collection;
    }

    if (value === "") {
      delete collection[id][prop];
      return collection;
    }
  }
  if (prop === "album") {
    collection[id][prop] = value;
  }
  return collection;
}


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


// 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"
  }
};

// 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(prop) === false) {
  collection[id][prop] = [];
}
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");


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
if (prop != "tracks" && value) {
  collection[id][prop] = value;
}
if (prop == "tracks" && !collection[id].tracks) {
  collection[id][prop] = [];
}
if (prop == "tracks" && value) {
  collection[id][prop].push(value);
}
if (!value) {
  delete collection[id][prop];
}

  return collection;
}

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


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  if (prop != 'tracks' && value != '') collection[id][prop] = value
  if (prop == 'tracks' && collection[id][prop] == undefined) collection[id][prop] = []
  if (prop == 'tracks' && value != '') collection[id][prop].push(value)
  if (value == '') delete collection[id][prop]

  return collection;
}

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


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  if (!value || value == '') {
    delete collection[id][prop];
  } else if (prop == 'tracks') {
    (collection[id].hasOwnProperty(prop)) ? collection[id][prop].push(value) : collection[id][prop] = [value];
  } else {
    collection[id][prop] = value;
  }
  return collection;
}

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


// 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"
  }
};

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

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


// 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"
  }
};

// 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') == false)){
    collection[id][prop] = [];
    collection[id][prop].push(value);
    }
  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");


// 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"
  }
};

// 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")== false)) {
    collection[id][prop] = [];
    collection[id][prop].push(value);
  }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");

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


// 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"
  }
};

// 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(prop)) {
    collection[id][prop] = [];
    collection[id][prop].push(value)
  } 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");

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


// 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"
  }
};

// Only change code below this line
function updateRecords(id, prop, value) {
  if (prop !== "tracks" && value !== "") {
    collection[id][prop] = value;
  } else if (prop === "tracks" && value !== "") {
    if (!collection[id].hasOwnProperty("tracks")) {
      collection[id].tracks = [];
    }
    collection[id].tracks.push(value);
  } else if (value === "") {
    delete collection[id][prop];
  }

  return collection;
}

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


// 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"
  }
};

// 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') == false) {
    collection[id]["tracks"] = [value];
  }

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

  else if (value == '') {
    delete collection[id][prop];
  }
  return collection;
}

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


RichText

Вы имеете ввиду квадратные скобки? ' и " - это кавычки, а [] - это квадратные скобки. 

Не вижу вашего примера как именно вы пытаетесь что делать, но предположу, что вы запутались со случаями использования переменных. К примеру, есть объект:

Если вы оперируете самими именами свойств, то да, можете обратиться к свойствам без скобок, например

Но, если вы хотите использовать переменную с именем, то тут только через квадратные скобки. Например

Здесь вы получите ["one", "two"], потому что фактически будет запрошено artists["Jon"].albums

Но если вы попытаетесь не через скобки, а через точку запросить artists.name.albums, то получите ["five", "six"], так как не будет использовано значение переменной name, а будет обращение к свойству name объекта. 

Почитайте внимательно

Доступ к свойствам объекта через точку

Доступ к свойствам объекта с помощью скобок

Доступ к свойствам объектов через переменные

 Смотрел и пробовал вариации исполнения задания и возник вопрос.

В таком исполнении код работает:

Обсуждение задания "Record Collection"

Хотел узнать: почему если убрать двойные ковычки в свойстве "artist" тут -  

updateRecords(5439, "artist", "ABBA"); и соответственно такие ковычки - [ ] в функции там где аргумент prop (предварительно перед ним ставя точку) все перестает работать? Изначально же в объекте JSON свойства идут без ковычек(" ") и доступ к ним мы можем получить используя путь без ковычек([ ]), например: console.log(collection[2548].artist) - будет "Bon Jovi". Для меня это было не понятно из предыдущих уроков. Да и сравнения я делал изначально так: if (prop != tracks...), то есть тоже без кавычек (в уловии задачи кстати тоже идет просьба сравнить с tracks без ковычек). Это ошибка синтаксиса доступа именно внутри функции? То есть вне функции мы можем обращаться к свойству объекта без использования ковычек а внутри функции при обращении ко всем свойствам и работе с аргументами мы должы ставить ковычки и спользовать [ ] соответственно?

Илья, когда мы значению присваиваем вот так: someVar = [value], то здесь мы сразу получаем новый массив, содержащий один элемент value. То есть это уже не пустой массив, а с одним элементом.

Когда мы присваиваем вот так: someVar = [], то здесь мы получаем в переменную чистый массив без единого элемента. 

Возможно вы видели что-то типа такого: (смотрите решение Оли Ершовой)

Здесь смысл в том, что если у треков вообще нет еще значения, то мы сначала задаем пустой массив. Но потом обратите внимание, что мы проверяем переменню value и если она не пустая, то добавляем ее к этому массиву. 

То есть суть проверки массива и установка пустого массива такова:

- Если массива еще нет, то создаем его.

- Если есть, то оставляем как есть.

- В итоге в любом случае у нас есть переменная-массив и мы пушим в нее значение, если оно не пустое.