Learn everything about React components, their types, lifecycle, props, state, best practices, and architecture to build modern web applications.
Introduction to React Components
React has become one of the most popular JavaScript libraries for building modern web applications. At the heart of React lies React components, the building blocks that make applications modular, reusable, and efficient. Whether you’re working with a class component in React, React reusable components, or React UI components, understanding their structure and best practices is essential for mastering modern web development.
This blog will take you through an in-depth React component tutorial, explaining the React component lifecycle, props, state, patterns, optimization techniques, and architecture. By the end, you’ll not only understand how to create React components, but also how to design them for performance, scalability, and maintainability.
What are React Components?
React components are independent, reusable pieces of UI. Each component represents a part of the user interface and can be combined to build complex web applications.
Definition: A React component is essentially a JavaScript function or class that returns UI elements using JSX.
Analogy: Think of React components as Lego blocks. Each block can be used individually, but when combined, they form a complete structure.
There are two main types:
Class Component in React — Uses ES6 classes and includes lifecycle methods.
Functional Components (with hooks) — Simpler and widely used with React Hooks.
Class Component in React
A class component in React extends React.Component and has access to features like state and lifecycle methods.
class Welcome extends React.Component {
constructor(props) {
super(props);
this.state = { message: “Hello, World!” };
}
render() {
return <h1>{this.state.message}</h1>;
}
}
Pros: Powerful lifecycle methods, explicit structure.
Cons: More verbose compared to functional components.
React Functional Components and Hooks
React JS components written as functions are simpler and often combined with Hooks. Hooks like useState and useEffect enable state and lifecycle management.
function Welcome() {
const [message, setMessage] = React.useState(“Hello, World!”);
return <h1>{message}</h1>;
}
Comparison (React components vs hooks):
Hooks allow functional components to handle state and side effects.
Functional components with hooks are lighter, more readable, and preferred in modern development.
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