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Summary React JS notes
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  • Course
  • CS3591
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  • Anna University,CEG,chennai-600025

React JS notes provide an extensive guide to mastering React, a popular JavaScript library for building user interfaces. Covering essential topics such as components, hooks, state management, and props, these notes are perfect for both beginners and experienced developers. They also delve into adva...

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Document information

  • September 30, 2024
  • 3
  • 2024/2025
  • Summary

Subjects

  • react js notes
  • react tutorial notes
  • react study material
  • react learning resources
  • react revision notes

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  • Anna University,CEG,chennai-600025
  • CS3591
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ReactJS Overview
1. Introduction to ReactJS

History of ReactJS: ReactJS was developed by Facebook in 2013 as a JavaScript library for building

user interfaces, especially for single-page applications.

Characteristics of ReactJS: React is component-based, declarative, and allows for building complex

UIs using reusable components.

Virtual DOM: React uses a virtual DOM for fast updates to the UI by comparing changes between

the actual DOM and virtual DOM.

2. Components in ReactJS

Functional Components: React supports functional components, which are JavaScript functions that

return JSX (JavaScript XML) for rendering the UI.

Class Components: React also allows for class components, which are ES6 classes extending

React.Component.

Component Lifecycle: Class components have lifecycle methods like componentDidMount,

componentDidUpdate, and componentWillUnmount.

3. JSX in ReactJS

JSX Syntax: JSX is a syntax extension for JavaScript that looks like HTML but is converted to

React.createElement calls behind the scenes.

Embedding Expressions: JSX allows embedding JavaScript expressions within curly braces for

dynamic content.

Conditional Rendering: JSX supports conditional rendering using if statements or the ternary

operator.

4. State and Props in ReactJS

State: State in React is an object that holds data specific to a component and can be updated using

the setState function in class components.

Props: Props are immutable properties passed from a parent component to a child component to

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