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React Hooks transformed how we write React components. From useState to useEffect to custom hooks — this guide covers every important hook with practical examples you'll actually use in real projects.

The TypeScript vs JavaScript debate is over — TypeScript won. But understanding why helps you use it better. This guide breaks down every difference, when each makes sense, and how to migrate your JS project to TypeScript painlessly.

JavaScript array methods are the bread and butter of every developer. map, filter, reduce, find, flat, flatMap — knowing when to use which transforms messy loops into clean, readable code. Here's your complete, practical reference.

ES2025 brings powerful new features to JavaScript — from better pattern matching to improved async iterators and new Array methods. Here's your complete breakdown of every major feature with practical code examples.

TypeScript is no longer optional — it's the standard for professional JavaScript development in 2026. If you know JavaScript, this guide will get you up to speed with TypeScript in one sitting, with everything explained using practical examples.

Next.js 15 brought major improvements to caching, async APIs, the Turbopack bundler, and React 19 support. This guide covers every significant change with code examples so you know exactly what's new and how to use it.

The Next.js App Router is now the default way to build Next.js apps. It brings file-based routing, layouts, server components, streaming, and more. This guide covers everything you need to master the App Router from scratch.