Problem:
Hi, Im trying to complete this updateRecords function, but then im in stuck figuring out the collection[id][prop] from the spoiler. It work prefectly without any error, but when i tried to do the same with the Accessing Nested Objects tutorial, it’s returning an error message “error: Uncaught TypeError: Cannot read property ‘outside’ of undefined”.
Can Anyone tell me How the collection[id][prop] work?
Accessing Nested Objects Tutorial
// Setup
var myStorage = {
"car": {
"inside": {
"glove box": "maps",
"passenger seat": "crumbs"
},
"outside": {
"trunk": "jack"
},
"234": {
"outside": "hello"
}
}
};
myStorage[234]["outside"]; // this line returning an error
Record 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"
}
};
// 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 !== "") {
if(collection[id][prop]) {
collection[id][prop].push(value);
}
else {
collection[id][prop]=[value];
}
} else if (value !== "") {
collection[id][prop] = value;
} else {
delete collection[id][prop];
}
return collection;
}
// Alter values below to test your code
updateRecords(5439, "artist", "ABBA");
Link to the challenge: