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Rith Banerjee

@rithcoderr

learn code

Joined August 2025

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Rith Banerjee's blogs

Rith Banerjeeeblog.rithbanerjee.site36 posts

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How WhatsApp Works Without Internet: Offline Messaging and Sync Explained

3d ago · 3 min read · You are on a flight. Airplane mode is on. You text your friend. The app doesn't crash. It shows a clock icon. Later, you land. The message sends. How? Internet is unreliable. Tunnels, elevators, bad c

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How React Virtual DOM Works Under the Hood

3d ago · 3 min read · Direct DOM manipulation is slow. Updating the screen directly forces the browser to recalculate layouts and repaint pixels. Do this too often, your app lags. React solves this. How? The Virtual DOM. T

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How Instagram, WhatsApp, Uber & Netflix Would Be Built Today Using Expo Router

3d ago · 4 min read · Building a todo app is easy. Building Instagram is hard. The difference isn't the code. It's the architecture. Let's look at how massive mobile apps scale using React Native and Expo Router. No fluff.

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JavaScript Modules: Import and Export Explained

Apr 29 · 6 min read · How to organize your code like a pro using ES6 modules The Problem: Why One Giant File Doesn’t Scale When you first start learning JavaScript, it’s tempting to put everything in a single app.js file.

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RBRith Banerjeeblog.rithbanerjee.site

Async Code in Node.js: Callbacks and Promises

Apr 29 · 8 min read · Introduction: The Sync vs. Async Reality Check Imagine you're building a web server that needs to read a file from disk. In a traditional, synchronous world, your code would look something like this:

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Rith Banerjee

About

Available for

Rith Banerjee's blogs

Recently published

How WhatsApp Works Without Internet: Offline Messaging and Sync Explained

How React Virtual DOM Works Under the Hood

How Instagram, WhatsApp, Uber & Netflix Would Be Built Today Using Expo Router

JavaScript Modules: Import and Export Explained

Async Code in Node.js: Callbacks and Promises

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Rith Banerjee

About

Available for

Rith Banerjee's blogs

Recently published

How WhatsApp Works Without Internet: Offline Messaging and Sync Explained

How React Virtual DOM Works Under the Hood

How Instagram, WhatsApp, Uber & Netflix Would Be Built Today Using Expo Router

JavaScript Modules: Import and Export Explained

Async Code in Node.js: Callbacks and Promises