@leonov

How do Promises work in JavaScript?

Explain Promises in JavaScript, their states, and how to handle asynchronous operations using .then(), .catch(), and async/await.

• JavaScript
• Netflix
• Middle

What is the Virtual DOM in React?

Describe the Virtual DOM in React and explain how it contributes to performance improvements in UI updates.

• React
• Google
• Senior

Describe the Event Loop in JavaScript

How does the Event Loop work in JavaScript? Explain its role in asynchronous programming and non-blocking I/O.

• JavaScript
• Meta (Facebook)
• Junior

How does garbage collection work in programming languages?

Explain the concept of garbage collection. Describe common garbage collection algorithms.

• Memory Management
• Microsoft
• Middle

How do you handle errors in a React application?

Discuss error boundaries and other strategies for handling errors gracefully in React.

• Amazon
• Staff

What is a message broker?

Describe the role of a message broker in an application architecture. Give examples.

• Meta (Facebook)
• Senior

Explain the concept of sharding in databases

What is database sharding? When and why would you implement sharding?

How do you handle authentication and authorization in a web application?

Describe different approaches to user authentication and authorization.

What is the purpose of a CDN?

Explain how a CDN improves performance and reliability for web content.

Explain the concept of eventual consistency in distributed systems

What is eventual consistency? Discuss its implications and common use cases.