8 JavaScript Interview Questions and Answers

A Guide to JavaScript Interview Success

JavaScript is a versatile language used in various applications, from web development to server-side programming. Below are eight common JavaScript interview questions that explore fundamental concepts, patterns, and practices. Each question includes an answer and a code example to help you prepare for your next interview.

What is a Closure in JavaScript?

Answer: A closure is a feature in JavaScript where an inner function has access to the outer (enclosing) function’s variables — a scope chain. Closures are used for implementing privacy and encapsulation, and for creating function factories and module patterns.

Example:

Explain the difference between var, let, and const.

Answer: The main differences between var, let, and const lie in scope and reassignment capabilities. var is function-scoped, while let and const are block-scoped. var variables can be re-declared and updated, let variables can be updated but not re-declared within the same scope, and…