--- title: "Pratham Kumar (@devprathamkumar) | Hashnode" description: "Engineering solutions through code. Read the latest articles by Pratham Kumar on Hashnode." url: "https://hashnode.com/@devprathamkumar" --- @devprathamkumar # Pratham Kumar @devprathamkumar · Joined January 2026 Engineering solutions through code. ### [How ChatGPT Understands Your Questions?](https://withprathamkumar.hashnode.dev/how-chatgpt-understands-your-questions?utm_source=hashnode&utm_medium=feed) A Beginner's Guide to LLMs, Tokens, and Transformers- 7 min read · [withprathamkumar.hashnode.dev](https://withprathamkumar.hashnode.dev/how-chatgpt-understands-your-questions?utm_source=hashnode&utm_medium=feed) [Jul 1](https://hashnode.com/posts/how-chatgpt-understands-your-questions/6a44dfe90b84fd3851676391) ### [Expo Router vs React Navigation](https://withprathamkumar.hashnode.dev/expo-router-vs-react-navigation?utm_source=hashnode&utm_medium=feed) Confused between Expo Router and React Navigation for your React Native apps? Learn the differences, tradeoffs, scalability considerations, and when each solution makes the most sense in 2026. 7 min read · [withprathamkumar.hashnode.dev](https://withprathamkumar.hashnode.dev/expo-router-vs-react-navigation?utm_source=hashnode&utm_medium=feed) [May 23](https://hashnode.com/posts/expo-router-vs-react-navigation/6a111d051f237623ea5953b4) ### [How Instagram, WhatsApp, Uber & Netflix Would Be Built Today Using Expo Router](https://withprathamkumar.hashnode.dev/how-instagram-whatsapp-uber-netflix-would-be-built-today-using-expo-router?utm_source=hashnode&utm_medium=feed) Learn how modern large-scale mobile apps are architected using Expo Router, feature-based architecture, scalable navigation patterns, realtime systems, caching strategies, and production engineering practices. 6 min read · [withprathamkumar.hashnode.dev](https://withprathamkumar.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/6a1118a81f237623ea5747fd) ### [Understanding the this Keyword in JavaScript](https://withprathamkumar.hashnode.dev/understanding-the-this-keyword-in-javascript?utm_source=hashnode&utm_medium=feed) Learn how this works in JavaScript by understanding how its value changes based on who is calling the function, with simple and practical examples. 4 min read · [withprathamkumar.hashnode.dev](https://withprathamkumar.hashnode.dev/understanding-the-this-keyword-in-javascript?utm_source=hashnode&utm_medium=feed) [May 10](https://hashnode.com/posts/understanding-the-this-keyword-in-javascript/6a00baf3e3eebc2e20a85084) ### [The Node.js Event Loop Explained](https://withprathamkumar.hashnode.dev/the-node-js-event-loop-explained?utm_source=hashnode&utm_medium=feed) Understand how the Event Loop powers asynchronous behavior in Node.js, allowing it to handle thousands of requests efficiently using a single thread 4 min read · [withprathamkumar.hashnode.dev](https://withprathamkumar.hashnode.dev/the-node-js-event-loop-explained?utm_source=hashnode&utm_medium=feed) [May 10](https://hashnode.com/posts/the-node-js-event-loop-explained/6a00b881e3eebc2e20a6647e)