---
title: "Md Zulqarnain (@ZulqarnainMD) | Hashnode"
description: "Believe. Read the latest articles by Md Zulqarnain on Hashnode."
url: "https://hashnode.com/@ZulqarnainMD"
---

@ZulqarnainMD

# Md Zulqarnain

@ZulqarnainMD · Joined January 2026

Believe

### [Beyond the Surface: How React’s Virtual DOM Works Under the Hood](https://nianraqluz.hashnode.dev/beyond-the-surface-how-react-s-virtual-dom-works-under-the-hood?utm_source=hashnode&utm_medium=feed)

In the early days of web development, updating a page was like renovating a house by tearing the whole thing down and rebuilding it from scratch just to change a lightbulb. Today, we expect interfaces

5 min read · [nianraqluz.hashnode.dev](https://nianraqluz.hashnode.dev/beyond-the-surface-how-react-s-virtual-dom-works-under-the-hood?utm_source=hashnode&utm_medium=feed)

[May 9](https://hashnode.com/posts/beyond-the-surface-how-react-s-virtual-dom-works-under-the-hood/69fec448f239332df4506718)

### [What is Node.js? JavaScript on the Server Explained](https://nianraqluz.hashnode.dev/what-is-node-js-javascript-on-the-server-explained?utm_source=hashnode&utm_medium=feed)

Learn how Node.js works under the hood. How is it a Go To for developers...

5 min read · [nianraqluz.hashnode.dev](https://nianraqluz.hashnode.dev/what-is-node-js-javascript-on-the-server-explained?utm_source=hashnode&utm_medium=feed)

[May 3](https://hashnode.com/posts/what-is-node-js-javascript-on-the-server-explained/69f74b260ab374db99c333f2)

### [Map and Set in JavaScript](https://js-mastery-101.hashnode.dev/map-and-set-in-javascript?utm_source=hashnode&utm_medium=feed)

Map() Map() Objects were introduced in ES6 (ECMAScript 2015) to address the limitations of using plain Objects for data storage and management. What is Map() A JavaScript Map() object is a collection

4 min read · [js-mastery-101.hashnode.dev](https://js-mastery-101.hashnode.dev/map-and-set-in-javascript?utm_source=hashnode&utm_medium=feed)

[May 2](https://hashnode.com/posts/map-and-set-in-javascript/69f5fae00ab374db99f9463a)

### [Understanding the this Keyword in JavaScript](https://js-mastery-101.hashnode.dev/understanding-the-this-keyword-in-javascript?utm_source=hashnode&utm_medium=feed)

In JavaScript, this is one of those concepts that feels like a riddle until it suddenly "clicks." If you’ve ever been confused about why this sometimes refers to the window, sometimes an object, and s

3 min read · [js-mastery-101.hashnode.dev](https://js-mastery-101.hashnode.dev/understanding-the-this-keyword-in-javascript?utm_source=hashnode&utm_medium=feed)

[Apr 21](https://hashnode.com/posts/understanding-the-this-keyword-in-javascript/69e70ee4c9501dd01080d61b)

### [Destructuring in JavaScript](https://js-mastery-101.hashnode.dev/destructuring-in-javascript?utm_source=hashnode&utm_medium=feed)

Destructuring is a JavaScript syntax introduced in ES6 (2015) that allows you to "unpack" values from arrays or properties from objects into distinct variables in a single, concise expression. It make

5 min read · [js-mastery-101.hashnode.dev](https://js-mastery-101.hashnode.dev/destructuring-in-javascript?utm_source=hashnode&utm_medium=feed)

[Apr 21](https://hashnode.com/posts/destructuring-in-javascript/69e70ce8c9501dd0107e362f)