React Development Masterclass

Learn components, hooks, state, props and modern React professionally.

🌐 Introduction to React

React is a JavaScript library used to build fast and interactive user interfaces. Instead of updating the whole page, React updates only the parts that change using a Virtual DOM. This makes applications faster and smoother.

React uses a component-based architecture. Every UI part is a reusable component. Buttons, cards, forms, dashboards, and pages are all components in React.

React is widely used for building dashboards, admin panels, SaaS apps, social networks, e-commerce platforms, and AI frontends. Companies prefer React because it is scalable, maintainable, and developer friendly.

Professional React developers think in terms of state, props, effects, performance, and composition. They break large UIs into small reusable pieces.

🧩 Core React Concepts

✅ Component

function Welcome(){
 return <h1>Hello React</h1>;
}

✅ Props

function Card(props){
 return <h3>{props.title}</h3>;
}

✅ State

const [count,setCount] = React.useState(0);

✅ Event Handling

<button onClick={() => setCount(count+1)}>+</button>

✅ Render

ReactDOM.createRoot(root).render(<App />);

These concepts allow React to manage UI efficiently and make apps interactive.

🪝 React Hooks

Hooks let you use state and lifecycle features in functional components. They make code simpler and reusable.

✅ useState

const [name,setName] = React.useState("Kishore");

✅ useEffect

React.useEffect(()=>{
 console.log("Mounted");
},[]);

✅ Example Counter

function Counter(){
 const [count,setCount] = React.useState(0);
 return (
  <div>
   <h2>{count}</h2>
   <button onClick={()=>setCount(count+1)}>+</button>
  </div>
 );
}

🧪 React Live Practice Playground

Below is a live React editor. Edit the component and see output instantly.

Practice Tasks