Interview Strike: React & .NET Interview Prep

🚀 8 Advanced React Features You Must Know in 2025 React has grown a lot since its early days. Beyond state, props, and hooks , React 18 introduced powerful advanced features that make apps more responsive, resilient, and scalable . If you’re aiming to level up your React skills, understanding these features is a must. In this blog, we’ll explore 8 advanced React features with definitions, explanations, and code examples . 1. ⚡ Concurrent Rendering (React 18) Definition Concurrent Rendering in React 18 allows React to prepare multiple versions of the UI simultaneously without blocking the main thread. Explanation Makes rendering interruptible and non-blocking . Keeps the UI responsive during heavy updates . Enabled by default in React 18 with features like startTransition and useDeferredValue . Example import { useState } from "react"; function App() { const [count, setCount] = useState(0); return ( <div> <button onClick={() => se...

React makes it easy to manage local component state with useState and useReducer. But as apps grow, so does the complexity of state. Passing data through multiple layers of components (prop drilling) becomes frustrating. That’s where state management patterns and libraries beyond React come in. In this blog, we’ll cover when to lift state, when to use global stores, and explore popular tools like Redux Toolkit, React Query, Zustand, MobX, and even a Context + Reducer pattern. 1. When to Move State Up vs External Store Definition : Moving state up → Keeping shared state in a common parent component to avoid prop drilling. External store (global state) → Keeping state outside React components (e.g., Redux, Zustand) so multiple parts of the app can access it directly. Explanation : Use lifting state up if only a few components need the data. Use an external store if many unrelated parts of the app need the same state (e.g., user authentication, theme, shopping cart). Example (Prop Drilli...

React is powerful because it gives us flexibility in how we design and structure components. As projects grow, you’ll find yourself needing different patterns to organize code, share logic, and create reusable UIs. In this blog, we’ll cover 6 important React component patterns with definitions, explanations, and examples: 1. Controlled Components 2. Uncontrolled Components 3. Container vs Presentational Components 4. Higher-Order Components (HOCs) 5. Render Props 6. Compound Components --- 🔹 1. Controlled Components Definition: A controlled component is a form element (like <input>, <textarea>, <select>) where the value is controlled by React state. The UI reflects the state, and every change updates the state explicitly. This ensures one source of truth for form values. Example – Controlled Input import React, { useState } from "react"; function ControlledForm() {   // State holds the input value   const [name, setName] = useState("");   // Updat...

React has become one of the most popular JavaScript libraries for building user interfaces. Whether you’re just starting out or aiming to become a React pro , this roadmap will guide you through every major concept , step by step — from fundamentals to advanced architecture. 1. ⚛️ React Fundamentals What is React? → Component-based UI library, Virtual DOM basics JSX → Syntax, embedding expressions, fragments Components → Function vs Class, Props vs State Rendering → One-way data flow, conditional rendering, lists with keys Event Handling → Synthetic events, passing functions as props Controlled vs Uncontrolled Components → Forms and inputs Component Composition → Children, containment, specialization React.StrictMode → Development-time checks 2. 📦 State and Props Props → Immutable data, default props, prop types State → Local state, initializing, setState (class) vs useState (hooks) State Lifting → Sharing state across components Derived State → When ...