Javascript Programming Tutorials, Guides & Best Practices

Introduction

React's ecosystem is vast, with a multitude of libraries that enhance its functionality and simplify development tasks. This cheatsheet covers a wide array of React libraries, organized by category, with brief descriptions of each. These libraries can help you build robust, maintainable, and efficient React applications.

Create an index.js file and add the following code:

const express = require('express');
const { ApolloServer, gql } = require('apollo-server-express');

// Sample data
let books = [
    { title: 'The Great Gatsby', author: 'F. Scott Fitzgerald' },
    { title: 'To Kill a Mockingbird', author: 'Harper Lee' },
];

// GraphQL schema definition
const typeDefs = gql`
    type Book {
        title: String!
        author: String!
    }

    type Query {
        books: [Book]
    }

    type Mutation {
        addBook(title: String!, author: String!): Book
    }
`;

// GraphQL resolvers
const resolvers = {
    Query: {
        books: () => books,
    },
    Mutation: {
        addBook: (_, { title, author }) => {
            const newBook = { title, author };
            books.push(newBook);
            return newBook;
        },
    },
};

// Create Apollo server
const server = new ApolloServer({ typeDefs, resolvers });

const app = express();
server.applyMiddleware({ app });

app.listen({ port: 4000 }, () =>
    console.log(`🚀 Server ready at http://localhost:4000${server.graphqlPath}`)
);

import React from 'react';
import useFetch from './useFetch'; // Ensure correct import path

function UserList() {
    const { data, loading, error } = useFetch('https://jsonplaceholder.typicode.com/users');

    if (loading) return <p>Loading...</p>;
    if (error) return <p>Error: {error.message}</p>;

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

export default UserList;

• Reusability: The useFetch hook can be used across different components and applications, reducing code duplication and simplifying API interaction.
• Loading and Error States: Automatically manages loading and error states, providing a consistent way to handle asynchronous operations.
• Cleanup Handling: Prevents state updates on unmounted components, reducing potential memory leaks and ensuring stability.