JSX (JavaScript XML)

Why ReactJS ?

ReactJS, commonly known as React, is a JavaScript library developed by Facebook for building robust user interfaces. Here’s why React has become immensely popular among developers:...

Setting Up Your Development Environment:

Node.js Installation: Ensure Node.js is installed on your system as it includes npm (Node Package Manager), which we’ll use to manage dependencies.Create React App: Use Create React App to set up a new React project quickly. Run npx create-react-app my-app in your terminal to create a new React application named my-app....

Understanding React Components

Functional Components: These are simple functions that return JSX (JavaScript XML) to describe the UI.Class Components: Traditional React components defined using ES6 classes. They have additional features like lifecycle methods....

Creating Your First React Component:

In React, components are the building blocks of UIs. You can create a new component by defining a JavaScript function or class. Here’s an example of a simple functional component in React:...

JSX (JavaScript XML)

JSX allows you to write HTML-like code within JavaScript. It’s a syntax extension that makes React’s component structure more readable and expressive....

Working with Props and State:

Props (short for properties) and state are two fundamental concepts in React. Props are used to pass data from parent to child components, while state is used to manage component-specific data. Here’s an example of how to use props and state in a React component....

Handling Events:

In React, you can handle user events like clicks and input changes using event handlers. Event handlers are functions that are called when a specific event occurs....

Conditional Rendering:

React allows you to conditionally render components based on certain conditions. You can use JavaScript’s conditional operators like if statements and ternary operators to conditionally render components....

Lists and Keys:

When rendering lists of items in React, each item should have a unique key prop to help React identify which items have changed, added, or removed. Keys should be stable, predictable, and unique among siblings....

Styling React Components:

React allows you to style components using CSS, inline styles, or CSS-in-JS libraries like styled-components. You can use the style prop to apply inline styles to components. Here’s an example of styling a component with inline styles....

Introduction to React Hooks:

React Hooks are functions that allow functional components to use state and other React features without writing a class. They were introduced in React 16.8 to address common issues with class components, such as managing state and lifecycle methods....

Building a Simple React Application:

Now that you have a basic understanding of React, it’s time to build a simple React application. You can start by creating a project structure, defining components, managing state, and adding interactivity to your application. Here’s a simple example of a React application:...

Component Lifecycle:

Mounting Phase:constructor( ): Initializes state and binds event handlers.render( ): Renders the component’s UI based on initial state/props.componentDidMount( ): Executes after component insertion, ideal for initial setup and data fetching.Updating Phase:shouldComponentUpdate( ): Determines if the component should re-render.render( ): Updates the UI based on state/props changes.componentDidUpdate( ): Executes after component updates, useful for side effects based on new data.Unmounting Phase:componentWillUnmount( ): Executes just before component removal, used for cleanup tasks to prevent memory leaks....

React Router:

React Router is a library that enables routing in React applications, allowing you to define routes and navigate between different views or pages within a single-page application (SPA). You can install React Router using npm or yarn:...

Managing State with Context API:

The Context API in React provides a way to share state across the component tree without having to pass props manually at every level. It’s particularly useful for managing global state, such as user authentication, theme preferences, or language settings....