---
title: "Shailja Yadav (@shailja12) | Hashnode"
description: "Learning by writing and coding. Read the latest articles by Shailja Yadav on Hashnode."
url: "https://hashnode.com/@shailja12"
---

@shailja12

# Shailja Yadav

@shailja12 · Joined December 2025

Learning by writing and coding.

### [Retrieval-Augmented Generation (RAG): How It Works, Why It Helps, and Where It Falls Short](https://javascript-series.hashnode.dev/retrieval-augmented-generation-rag-how-it-works-why-it-helps-and-where-it-falls-short?utm_source=hashnode&utm_medium=feed)

Understanding about rag

8 min read · [javascript-series.hashnode.dev](https://javascript-series.hashnode.dev/retrieval-augmented-generation-rag-how-it-works-why-it-helps-and-where-it-falls-short?utm_source=hashnode&utm_medium=feed)

[Jul 19](https://hashnode.com/posts/retrieval-augmented-generation-rag-how-it-works-why-it-helps-and-where-it-falls-short/6a5ce6c64783af06122530e7)

### [How WhatsApp Works Without Internet](https://howwhatsappworkswithoutinternet.hashnode.dev/how-whatsapp-works-without-internet?utm_source=hashnode&utm_medium=feed)

Learn how WhatsApp works offline using SQLite, local storage, caching, synchronization, and end-to-end encryption architecture.

7 min read · [howwhatsappworkswithoutinternet.hashnode.dev](https://howwhatsappworkswithoutinternet.hashnode.dev/how-whatsapp-works-without-internet?utm_source=hashnode&utm_medium=feed)

[May 25](https://hashnode.com/posts/how-whatsapp-works-without-internet/6a14537c7d85e6a1afdde908)

### [How Instagram, WhatsApp, Uber & Netflix Would Be Built Today Using Expo Router](https://howappsbuildusingexporouter.hashnode.dev/how-instagram-whatsapp-uber-netflix-would-be-built-today-using-expo-router?utm_source=hashnode&utm_medium=feed)

Introduction When developers first start building React Native applications, the folder structure usually looks simple: src/ ├── screens/ ├── components/ ├── navigation/ ├── services/ └── utils/

9 min read · [howappsbuildusingexporouter.hashnode.dev](https://howappsbuildusingexporouter.hashnode.dev/how-instagram-whatsapp-uber-netflix-would-be-built-today-using-expo-router?utm_source=hashnode&utm_medium=feed)

[May 23](https://hashnode.com/posts/how-instagram-whatsapp-uber-netflix-would-be-built-today-using-expo-router/6a1134a21f237623ea66bfd0)

### [Expo Router vs React Navigation — Which One Should You Use in 2026?](https://exporouterreactnavigation.hashnode.dev/expo-router-vs-react-navigation-which-one-should-you-use-in-2026?utm_source=hashnode&utm_medium=feed)

Introduction Navigation is one of the most important parts of any mobile application. Whether you are building: Instagram WhatsApp Uber Netflix an admin dashboard or a simple ecommerce app use

10 min read · [exporouterreactnavigation.hashnode.dev](https://exporouterreactnavigation.hashnode.dev/expo-router-vs-react-navigation-which-one-should-you-use-in-2026?utm_source=hashnode&utm_medium=feed)

[May 23](https://hashnode.com/posts/expo-router-vs-react-navigation-which-one-should-you-use-in-2026/6a11336c1f237623ea6609ed)

### [Virtual DOM Under the Hood](https://virtual-dom-under-the-hood.hashnode.dev/virtual-dom-under-the-hood?utm_source=hashnode&utm_medium=feed)

The Problem With Traditional DOM Manipulation

6 min read · [virtual-dom-under-the-hood.hashnode.dev](https://virtual-dom-under-the-hood.hashnode.dev/virtual-dom-under-the-hood?utm_source=hashnode&utm_medium=feed)

[May 8](https://hashnode.com/posts/virtual-dom-under-the-hood/69fd51839f93a850a4517fc1)