React code refactoring guide: How to improve the code structure and readability of front-end applications

React code refactoring guide: How to improve the code structure and readability of front-end applications

In front-end development, code structure and readability are important for project maintenance and Scaling is crucial. As the project scale gradually increases and the code becomes more complex, we need to refactor the code to better organize the code and improve maintainability and readability. This article will introduce how to refactor React code from the following aspects and provide specific code examples.

1. Component splitting
In React development, splitting into smaller components is an effective way to refactor code. Splitting components increases code reusability, testability, and makes code easier to understand.

For example, suppose we have a component named UserCard, which is responsible for displaying the user's avatar, name, and description. If the UserCard component becomes large and difficult to maintain, we can consider splitting it into multiple small components, such as Avatar, Name and Description Components. In this way, each small component is only responsible for a specific function, which facilitates code reuse and maintenance.

The following is a sample code:

// UserCard.js
import React from 'react';
import Avatar from './Avatar';
import Name from './Name';
import Description from './Description';

const UserCard = ({ user }) => {
  return (
    <div>
      <Avatar avatarUrl={user.avatar} />
      <Name name={user.name} />
      <Description description={user.description} />
    </div>
  );
}

export default UserCard;

// Avatar.js
import React from 'react';

const Avatar = ({ avatarUrl }) => {
  return <img src={avatarUrl} alt="User Avatar" />;
}

export default Avatar;

// Name.js
import React from 'react';

const Name = ({ name }) => {
  return <h2 id="name">{name}</h2>;
}

export default Name;

// Description.js
import React from 'react';

const Description = ({ description }) => {
  return <p>{description}</p>;
}

export default Description;

By splitting the UserCard component into Avatar, Name and DescriptionThree small components, the code is more concise and easy to read, and the function of each small component can be tested independently.

2. State Management
In React applications, rational management and organization of component status is an important aspect of code reconstruction. When multiple components share the same state, the state can be promoted to the parent component to avoid duplicate management of state and data inconsistency.

For example, suppose we have a component named Counter that displays the value of the counter and provides the functions of adding one and subtracting one. If the Counter component and its subcomponents need to access the same counter value, we can promote the counter's state to the parent component to ensure data consistency.

The following is a sample code:

// Counter.js
import React, { useState } from 'react';
import Display from './Display';
import Button from './Button';

const Counter = () => {
  const [count, setCount] = useState(0);

  const increment = () => {
    setCount(count + 1);
  };

  const decrement = () => {
    setCount(count - 1);
  };

  return (
    <div>
      <Display count={count} />
      <Button onClick={increment}>+</Button>
      <Button onClick={decrement}>-</Button>
    </div>
  );
}

export default Counter;

// Display.js
import React from 'react';

const Display = ({ count }) => {
  return <p>{count}</p>;
}

export default Display;

// Button.js
import React from 'react';

const Button = ({ children, onClick }) => {
  return <button onClick={onClick}>{children}</button>;
}

export default Button;

By promoting the state of the counter into the parent component Counter, we ensure that the Display component and Button All components can access the same counter value, avoiding data inconsistency and repeated management problems.

3. Use Hooks
React Hooks are a new feature introduced in React 16.8, which can help us better organize and reuse code. By using Hooks, we can extract logically related code (such as state management, side effects, etc.) to make components more concise and readable.

For example, suppose we have a component named UserList that displays a list of users and obtains user data through AJAX requests. In the past, we might have placed the logic of the AJAX request in the componentDidMount lifecycle method. But after using Hooks, we can use useEffect Hook to handle side effects (such as AJAX requests) to make the component cleaner and readable.

The following is a sample code:

// UserList.js
import React, { useState, useEffect } from 'react';

const UserList = () => {
  const [users, setUsers] = useState([]);

  useEffect(() => {
    fetch('https://api.example.com/users')
      .then(response => response.json())
      .then(data => setUsers(data));
  }, []);

  return (
    <ul>
      {users.map(user => (
        <li key={user.id}>{user.name}</li>
      ))}
    </ul>
  );
}

export default UserList;

By using useEffect Hook to handle AJAX requests, we can understand the side effect logic of the component more clearly, while making the component structure more concise and readable.

Summary:
Through component splitting, state management, and refactoring techniques such as using Hooks, we can improve the code structure and readability of front-end applications. Properly organizing code and improving code reusability and maintainability are helpful for project expansion and maintenance. I hope the code examples provided in this article will help you refactor your React code.

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