What is the difference between class and functional components?

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Khushi Singh · Answer

The fundamental purpose of building user interface elements in React exists through two distinct component definitions called class components and functional components. Components in React differ mainly through their syntax structure as well as their behavioral and feature specifications.

1. Syntax and Structure

React Component extends all defined ES6 classes to create Class Components. Render() is a fundamental method that returns JSX as output from the components.
The syntax of Functional Components includes plain JavaScript functions that directly provide JSX output.

2. State Management

The this.state property enables class components to store internal state, which is updated by this.setState() method.
Before React Hooks, Functional Components could not maintain state until developers started using Hooks, including useState, which enabled them to manage both state and effects.

3. Lifecycle Methods

Class components utilize standard API lifecycle methods, which include componentDidMount as well as shouldComponentUpdate, and componentWillUnmount.
The lifecycle behaviors of Class Components are modeled by Hooks (including useEffect) to provide an improved and unified approach.

4. Readability and Modern Practice

Researchers find Functional Components more readable due to their compact size. The current style of React development selects functional components due to their easy nature and the power to utilize hooks.
The bigger the application grows, the more challenging Class Components become to manage because they require additional verbosity.

Summary

Hooks have made functional components as powerful as they are lightweight and straightforward.
Standard class components maintain support for existing development projects, even though new projects should use functional components.
The React framework recommends developers to use functional components for new projects because they deliver all features with an up-to-date and streamlined methodology.

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What is the difference between class and functional components?

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