Nested objects in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to access the city name inside the nested object.

Javascript

const person = { name: 'Alice', address: { city: [1], zip: '12345' } };
console.log(person.address.city);

Drag options to blanks, or click blank then click option'

A'New York'

BNew York

C'city'

Dcity

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around string values.

Using the key name instead of the value.

The city name is a string value, so it must be enclosed in quotes.

2fill in blank

medium

Complete the code to add a nested object for the phone number inside the contact object.

Javascript

const contact = { email: '[e-mail]', phone: [1] };
console.log(contact.phone.mobile);

Drag options to blanks, or click blank then click option'

A'123-456-7890'

B[ '123-456-7890' ]

C{ mobile: '123-456-7890' }

D1234567890

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string directly instead of an object.

Using an array instead of an object.

The phone property should be an object with a mobile property as a string.

3fill in blank

hard

Fix the error in accessing the nested property to get the postal code.

Javascript

const data = { location: { address: { postalCode: '90210' } } };
console.log(data.location.[1].postalCode);

Drag options to blanks, or click blank then click option'

ApostalCode

Bpostcode

Cpostal_code

Daddress

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect key names like 'postcode' or 'postal_code'.

Mixing camelCase and snake_case.

The correct key to access the postal code is 'address', not 'postcode' or others.

4fill in blank

hard

Fill both blanks to create a nested object with a name and an age property inside the user object.

Javascript

const user = { profile: { [1]: 'Bob', [2]: 30 } };
console.log(user.profile.name, user.profile.age);

Drag options to blanks, or click blank then click option'

Aname

Bage

Cusername

Dyears

Attempts:

3 left

💡 Hint

Common Mistakes

Using keys that don't match the console.log statement.

Using incorrect property names like 'username' or 'years'.

The nested object keys should be 'name' and 'age' to match the console.log access.

5fill in blank

hard

Fill all three blanks to create a nested object representing a book with title, author, and year properties.

Javascript

const book = { info: { [1]: '1984', [2]: 'George Orwell', [3]: 1949 } };
console.log(book.info.title, book.info.author, book.info.year);

Drag options to blanks, or click blank then click option'

Aname

Bauthor

Cyear

Dtitle

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong keys like 'name' instead of 'title'.

Mixing up the order of keys.

The keys must be 'title', 'author', and 'year' to match the console.log output.