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.
The code uses conditional rendering in React to display “Welcome back!” if the user is logged in (true), and “Please log in.” if the user is not logged in (false).
Example: This example shows the use of conditional rendering.
import React from 'react';
function Greeting({ isLoggedIn }) {
return isLoggedIn ? <h1>Welcome back!</h1> : <h1>Please log in.</h1>;
}
export default Greeting;
Getting Started with React
ReactJS, often referred to as React, is a popular JavaScript library developed by Facebook for building user interfaces. It emphasizes a component-based architecture, where UIs are built using reusable components. React uses a declarative syntax to describe how UIs should look based on their state, simplifying development and enhancing code readability.
React also utilizes a virtual DOM to optimize rendering performance by minimizing actual DOM manipulations. React’s unidirectional data flow and rich ecosystem of libraries and tools have made it a go-to choice for frontend development, especially in building single-page applications (SPAs).
Table of Content
- Why ReactJS ?
- Setting Up Your Development Environment
- Understanding React Components
- Creating Your First React Component
- JSX (JavaScript XML)
- Working with Props and State
- Handling Events:
- Conditional Rendering
- Lists and Keys
- Styling React Components
- Introduction to React Hooks
- Building a Simple React Application
- Component Lifecycle
- React Router
- Managing State with Context API