What is a React component?

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A React component is a fundamental building block of a React application. It’s essentially a reusable, self-contained piece of code that defines how a part of the user interface (UI) should look and behave.

Key points about React components:

Encapsulate UI and Logic: Components combine HTML-like markup (JSX) and JavaScript logic in one place.

Reusable: You can use the same component multiple times in different parts of your app.

Composable: Components can contain other components, forming a tree structure for complex UIs.

Manage State and Props: Components can hold their own data (state) and receive data from their parent (props).

Types of React Components

Functional Components

Written as JavaScript functions.

Can use hooks (like useState, useEffect) for state and lifecycle.

Example:

jsx

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function Greeting(props) {

  return <h1>Hello, {props.name}!</h1>;

}

Class Components (older style, less common now)

Written as ES6 classes.

Have lifecycle methods and state management.

Example:

jsx

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class Greeting extends React.Component {

  render() {

    return <h1>Hello, {this.props.name}!</h1>;

  }

}

Summary:

Concept Explanation

React Component A reusable UI building block combining markup and logic

Purpose Defines what to display and how it behaves

Types Functional components and class components

Features Can accept props, manage state, and handle events

Read More

Define JSX in React.

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