Top 10 JavaScript Interview Questions & Answers

In this video Faisal Nadeem shared 10 most important javascript interview questions and answers.

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Q1) What is JavaScript?
Answer: JavaScript is a scripting language used to create dynamic content on websites.

Q2) Difference between var, let, and const?
Answer: var: Function-scoped.
let: Block-scoped, reassignable.
const: Block-scoped, not reassignable.

Q3) What is a closure?
Answer: A closure is a function that remembers variables from its outer scope even after the outer function has finished.

Q4) What is hoisting?
Answer: JavaScript moves declarations to the top before execution.

Q5) What is the difference between == and ===?
Answer: ==: Compares values (type coercion).
===: Compares value and type (strict).

Q6) What are arrow functions?
Answer: A shorter syntax for functions that don't bind their own this.

Q7) What is the DOM?
Answer: The Document Object Model represents the page structure as a tree, allowing JS to manipulate it.

Q8) What is an event loop?
Answer: It handles asynchronous callbacks in JavaScript by using the call stack and task queue.

Q9) Explain async/await.
Answer: Syntax to write asynchronous code that looks like synchronous; used with Promises.

Q10) What are Promises?
Answer: Objects that represent the eventual result of an asynchronous operation.

Tell me something about yourself for experience candidates in english:
https://youtu.be/wL-lAZMAbos

Tell me something about yourself for fresher candidates in english:
https://youtu.be/ynBwYlJsBbA

More Interview Questions and Answers Playlist
https://youtube.com/playlist?list=PLrL4pgVAnStkmWc3EbaEW4J2x9LOBzggv


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