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Introduction

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ReactJS is a component-based JavaScript library used to build dynamic and interactive user interfaces. It simplifies the creation of single-page applications (SPAs) with a focus on performance and maintainability.

Features of React

React is one of the most demanding JavaScript libraries because it is equipped with a ton of features which makes it faster and production-ready. Below are the few features of React.

1. Virtual DOM

React uses a Virtual DOM to optimize UI rendering. Instead of updating the entire real DOM directly, React:

Creates a lightweight copy of the DOM (Virtual DOM).
Compares it with the previous version to detect changes (diffing).
Updates only the changed parts in the actual DOM (reconciliation), improving performance.

2. Component-Based Architecture

React follows a component-based approach, where the UI is broken down into reusable components. These components:

Can be functional or class-based.
It allows code reusability, maintainability, and scalability.

3. JSX (JavaScript XML)

React uses JSX, a syntax extension that allows developers to write HTML inside JavaScript. JSX makes the code:

More readable and expressive.
Easier to understand and debug.

4. One-Way Data Binding

React uses one-way data binding, meaning data flows in a single direction from parent components to child components via props. This provides better control over data and helps maintain predictable behavior.

5. State Management

React manages component state efficiently using the useState hook (for functional components) or this.state (for class components). State allows dynamic updates without reloading the page.

6. React Hooks

Hooks allow functional components to use state and lifecycle features without needing class components. Common hooks include:

useState: for managing local state.
useEffect: for handling side effects like API calls.
useContext: for global state management.

7. React Router

React provides React Router for managing navigation in single-page applications (SPAs). It enables dynamic routing without requiring full-page reloads.

ReactJS Lifecycle

Every React Component has a lifecycle of its own, the lifecycle of a component can be defined as the series of methods that are invoked in different stages of the component’s existence. React automatically calls these methods at different points in a component’s life cycle. Understanding these phases helps manage the state, perform side effects, and optimize components effectively.

Resources

Code Snippet

import React from 'react';

function App() {
  return (
    <div>
      <h1>Hello, World!</h1>
    </div>
  );
}

export default App;

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