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Top 25 JavaScript Interview Questions and Answers

Dhanush N
JavaScript in Plain English
8 min readSep 1, 2024

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Introduction:

JavaScript is a popular computer language used for web development. Preparing for a JavaScript interview might be difficult espeacially when dealing with its asynchronous nature, the need for an understanding of the Document Object Model (DOM), and its use of functions. . Here’s a list of the top 25 interview questions and answers to help you prepare.

1. What is JavaScript, and how is it different from Java?

Answer: JavaScript is a lightweight, interpreted programming language primarily used for client-side web development. It’s different from Java in that Java is a statically typed, compiled language, while JavaScript is dynamically typed and interpreted.

// JavaScript Example
console.log("Hello, World!");
// Java Example
public class Main {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}

2. Explain the concept of closures in JavaScript.

Answer: A closure is a function that remembers the environment in which it was created, allowing it to access variables from its outer function scope even after the outer function has returned.

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Published in JavaScript in Plain English

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Written by Dhanush N

Engineer, Chess enthusiast & Tech tinkerer. I build, break and hack systems while exploring the art of problem-solving. 🔗 https://www.youtube.com/@dhanushnehru

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