What are the best practices for creating custom hooks in React?

What are the best practices for creating custom hooks in React?

When creating custom hooks in React, it's important to follow a few best practices: 1. Use a clear naming convention, starting with 'use'. 2. Keep hooks focused on a single responsibility. 3. Ensure hooks are reusable and composable. 4. Manage state and side effects properly. 5. Document your hooks for better usability.

Can you give an example of a custom hook?

Sure! Here's a simple example of a custom hook that manages a counter:

import { useState } from 'react';

function useCounter(initialValue = 0) {
    const [count, setCount] = useState(initialValue);
    const increment = () => setCount(c => c + 1);
    const decrement = () => setCount(c => c - 1);
    return { count, increment, decrement };
}

This hook provides a counter with increment and decrement functions.

How do I test custom hooks?

You can test custom hooks using libraries like React Testing Library or Enzyme. For example, you can create a test component that uses your hook and then assert the expected behavior.

What are some common mistakes to avoid when creating custom hooks?

Common mistakes include not following the rules of hooks, creating hooks that are too complex, or failing to manage dependencies properly in useEffect.