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React.js
React.js is a JavaScript library developed by Facebook for building user interfaces. It allows developers to build reusable UI components and manage state efficiently, making it ideal for single-page applications.
Creating a React App with Create React App (CRA)
You can quickly scaffold a React project using npx create-react-app. It comes pre-configured with Webpack, Babel, and a development server—ideal for learning and building small to medium-sized apps.
JSX Syntax and How It Works
JSX stands for JavaScript XML. It allows you to write HTML-like syntax in your JavaScript code, making the UI code more readable and expressive. JSX is transpiled into React’s React.createElement() calls.
React supports both functional and class-based components. Functional components are simpler and support Hooks, while class components use lifecycle methods like componentDidMount and render.
The useState Hook is used in functional components to handle component-level state. It allows you to declare a state variable and update it in response to user interactions.
Side Effects with useEffect()
The useEffect Hook is used to perform side effects in React components, such as fetching data, updating the DOM, or setting up event listeners. It replaces lifecycle methods in class components.
Handling Events in React
React uses synthetic events that work consistently across all browsers. You can handle events like clicks, form submissions, or keyboard inputs using standard event handling in JSX.
Conditional Rendering
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React allows conditional rendering using JavaScript expressions. You can use if statements, ternary operators, or logical && to show or hide components based on the application state.
Lists and Keys in React
To render a list of items in React, you use the .map() method. Each item in the list should have a unique key prop to help React efficiently update the DOM.
Forms and Controlled Components
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Controlled components in React are form elements (like inputs) whose values are controlled by React state. This allows for easier form validation, pre-filling, and input tracking.
Lifting State Up
When multiple components need access to the same state, it’s best to lift the state up to the nearest common ancestor. This ensures a single source of truth and keeps your app organized.