What is the main goal of Cross-Site Scripting (XSS) attacks?

To execute malicious scripts in the victim’s browser

To inject malicious SQL queries into a database

To trick users into providing sensitive information

To force users to change their passwords

Which of the following methods helps prevent Cross-Site Request Forgery (CSRF)?

Implementing password complexity rules

Validating the format of input fields

How can a frontend developer help prevent XSS attacks?

By escaping or sanitizing HTML content

By validating user input on the client-side

By disabling JavaScript in the browser

By using strong encryption on all forms

How does the Content Security Policy (CSP) header help mitigate security risks like XSS?

It restricts the types of resources (e.g., scripts) that can be loaded on a webpage

It prevents users from submitting forms without validation

It forces users to log in using multi-factor authentication

It encrypts data sent between the browser and the server

How does React’s useMemo hook help optimize performance in a component?

By caching the results of expensive function calculations between renders

By memoizing component rendering

By preventing re-rendering of child components

By avoiding side effects in functional components

What happens when you pass a function as the second argument to setState in a class component?

The function receives the previous state and props, and updates state based on them

The function will be executed after the state has been updated

The function will replace the current state instead of merging it

The function is used to force the component to re-render immediately

What is the primary purpose of React’s useEffect hook?

To handle side effects in functional components

To define how a component should render

To create a context for global state management

What is the virtual DOM in React?

A lightweight representation of the real DOM for improved performance

A real-time copy of the browser’s DOM

A database for storing React components

A debugging tool used by React developers

What is the difference between getStaticProps and getServerSideProps in Next.js?

getStaticProps runs at build time, while getServerSideProps runs on every request

getStaticProps is for client-side data fetching, while getServerSideProps is for server-side fetching

getStaticProps is used for API routes, while getServerSideProps is used for page routes

There is no difference; they are interchangeable

What feature of Next.js allows for both static generation and server-side rendering in the same application?

Incremental Static Regeneration (ISR)

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Practice Problem

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Hard

Тетяна Струк

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20 questions

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MULTIPLE CHOICE QUESTION

1 min • 3 pts

What is in the console?

undefined

MULTIPLE CHOICE QUESTION

1 min • 3 pts

What is in the console?

"true"

true

MULTIPLE CHOICE QUESTION

1 min • 3 pts

What is in the console?

true

false

MULTIPLE CHOICE QUESTION

1 min • 3 pts

What is in the console?

string

number

true

MULTIPLE CHOICE QUESTION

1 min • 3 pts

What is in the console?

NaN

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Who is this?

Evan You

Dan Abramov

Minko Gechev

John Papa

Answer explanation

Product and DevRel lead for Angular at Google.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Who is this?

Evan You

Dan Abramov

Minko Gechev

John Papa

Answer explanation

Creator of the JavaScript framework Vue.js and the frontend build tool Vite.

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20 questions

What is in the console?

What is in the console?

What is in the console?

What is in the console?

What is in the console?

Who is this?

Product and DevRel lead for Angular at Google.

Who is this?

Creator of the JavaScript framework Vue.js and the frontend build tool Vite.

Who is this?

Co-author of Redux and Create React App

Who is this?

Google Developer Expert in Angular | YouTube Content Creator | Instructor in Web Development

What is the main goal of Cross-Site Scripting (XSS) attacks?

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