Skip to content

Latest commit

 

History

History
63 lines (43 loc) · 2.26 KB

javascript-common-questions.md

File metadata and controls

63 lines (43 loc) · 2.26 KB

Advanced JavaScript Questions

1. Closures & Scope

  • What are closures in JavaScript? Provide an example.
  • How does variable hoisting work in JavaScript?
  • What’s the difference between var, let, and const in terms of scope?
  • Explain the Temporal Dead Zone (TDZ).

2. Asynchronous JavaScript (Promises, Async/Await, Event Loop)

  • How does the event loop work in JavaScript?
  • What is the difference between microtasks and macrotasks?
  • Explain the difference between Promise.all, Promise.allSettled, Promise.race, and Promise.any.
  • How does async/await work internally?

3. Prototypes & Inheritance

  • What is prototypal inheritance?
  • What is the difference between __proto__ and prototype?
  • How does Object.create() work?

4. Memory Management & Performance

  • How does JavaScript handle garbage collection?
  • What are memory leaks in JavaScript, and how do you prevent them?
  • What’s the difference between deep copy and shallow copy?

5. Functional Programming

  • What is currying, and how does it work?
  • What is the difference between .map(), .filter(), and .reduce()?
  • What are pure functions, and why are they important?

6. JavaScript Engines & Compilation

  • How does the V8 engine work?
  • What is JIT compilation in JavaScript?
  • Explain hidden classes in V8 and how they affect performance.

7. Event Delegation & DOM Manipulation

  • What is event delegation, and how does it improve performance?
  • What is the difference between e.stopPropagation() and e.preventDefault()?
  • How does debouncing and throttling work?

8. Advanced Object Concepts

  • What’s the difference between Object.freeze(), Object.seal(), and Object.preventExtensions()?
  • How do you create an immutable object in JavaScript?
  • What are symbols, and when should you use them?

9. Modules & Design Patterns

  • What’s the difference between CommonJS and ES6 Modules?
  • Explain the Revealing Module Pattern.
  • How do you implement the Singleton Pattern in JavaScript?

10. Meta-Programming (Proxy, Reflect, etc.)

  • What is the Proxy object in JavaScript, and how do you use it?
  • What is the purpose of the Reflect API?
  • How does defineProperty() work?