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JSX (JavaScript)

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Formerly JavaScript Syntax eXtension

Introduction to JSX

JSX (JavaScript XML) is a syntax extension for JavaScript, commonly used with React to describe what the React UI should look like. By using JSX, React developers can write HTML structures in the same JavaScript file as JavaScript code, without the need for separate JavaScript template files. JSX compiles into React createElement() calls which render the HTML structure of React components.

GitHub Repository

The JSX specification and its transformations are generally maintained within React repositories and Babel repositories. For direct JSX specification, there isn't a standalone GitHub repo, but its implementation can be found within the Babel repository: s://github.com/babel/babel(https://github.com/babel/babel). Babel is a JavaScript compiler that transforms JSX syntax into standard JavaScript.

Official Documentation

JSX is extensively documented within the React documentation, as it's most commonly used with React. The official documentation for JSX can be found here: https://reactjs.org/docs/introducing-jsx.html.

Official Website

While JSX doesn't have its own official website, information about JSX can primarily be found through React's official website: s://reactjs.org/(https://reactjs.org/).

Main Features of JSX

1. JSX Syntactic Sugar for `React.createElement()`: Simplifies the creation of React elements. 2. JSX Embedding Expressions: Allows JavaScript expressions to be embedded within the HTML structure. 3. JSX JavaScript Functionality: Enables the use of JavaScript functions and variables directly within the JSX markup. 4. JSX Declarative Syntax: Makes the code more readable and easier to debug. 5. JSX Type Safety: When used with TypeScript, JSX provides type checking, enhancing code reliability. 6. JSX Component-based Structure: Facilitates the development of reusable UI components. 7. JSX Optimization: Tools like Babel compile JSX down to efficient JavaScript code.

Code Examples

1. JSX Basic JSX Syntax: ```jsx const element = <h1>Hello, world!</h1>; ```

2. JSX Embedding Expressions: ```jsx const name = 'Josh Perez'; const element = <h1>Hello, {name}</h1>; ```

3. JSX JSX as Children: ```jsx const element = (

 
   Hello!
   Good to see you here.

); ```

4. JSX JavaScript Functions in JSX: ```jsx function formatName(user) {

 return user.firstName + ' ' + user.lastName;

}

const user = {

 firstName: 'Harper',
 lastName: 'Perez'

};

const element = <h1>Hello, {formatName(user)}!</h1>; ```

5. JSX Conditional Rendering: ```jsx const user = {name: “Tom”}; const element = <h1>Hello, {user ? user.name : 'Stranger'}!</h1>; ```

6. JSX Attributes in JSX: ```jsx const element = <img src={user.avatarUrl}></img>; ```

7. JSX Children in JSX: ```jsx const element = (

 
   Hello!
   {children}

); ```

8. JSX Fragments: ```jsx const element = (

 <>
   Hello!
   Good to see you here.

); ```

Popular 3rd Party Libraries

1. JSX Babel JSX Plugin: Transforms JSX code into JavaScript code. 2. JSX ESLint Plugin JSX-a11y: Helps in linting JSX for accessibility issues. 3. JSX Prettier: An opinionated code formatter that supports JSX formatting. 4. JSX Styled-Components: Utilizes tagged template literals to style your components. 5. JSX React Router: Works seamlessly with JSX for routing in React applications.

Competition or Alternatives

1. JSX Template Literals: For simpler projects, template literals can be used for HTML rendering in JavaScript. 2. JSX Vue.js: Uses an HTML-based template syntax that allows binding the rendered DOM to the underlying Vue instance's data. 3. JSX Angular: Employs HTML with additional markup for components, binding, and directives. 4. JSX Svelte: Compiles components written in a proprietary syntax into efficient JavaScript that surgically updates the DOM. 5. JSX Pug (formerly Jade): A high-performance template engine heavily influenced by HAML and implemented with JavaScript for Node.js and browsers.

This concise summary provides an overview of JSX, including its definition, how it's used, its features, examples, popular third-party libraries, and alternatives. For an in-depth understanding, referring to the official React documentation and related resources such as Babel for JSX transformation specifics is recommended.

Snippet from Wikipedia: JSX (JavaScript): JSX (sometimes referred to as JavaScript XML) is an XML-like extension to the JavaScript language syntax. Initially created by Facebook for use with React, JSX has been adopted by multiple web frameworks.^: 5^: 11 Being a syntactic sugar, JSX is generally transpiled into nested JavaScript function calls structurally similar to the original JSX.

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Snippet from Wikipedia: React (software): React (also known as React.js or ReactJS) is a free and open-source front-end JavaScript library that aims to make building user interfaces based on components more "seamless". It is maintained by Meta (formerly Facebook) and a community of individual developers and companies.
React can be used to develop single-page, mobile, or server-rendered applications with frameworks like Next.js and Remix. Because React is only concerned with the user interface and rendering components to the DOM, React applications often rely on libraries for routing and other client-side functionality. A key advantage of React is that it only re-renders those parts of the page that have changed, avoiding unnecessary re-rendering of unchanged DOM elements.

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