React Custom Hooks: Reusable Logic for Cleaner Components

Creating a Simple Custom Hook

Let's create a custom hook that tracks the window width and updates on resize.

This hook encapsulates the logic for subscribing to window resize events and managing state.

Using Custom Hooks in Components

Once you create a custom hook, you can use it inside any functional component just like built-in hooks.

This promotes cleaner components by moving complex logic outside the component body.

• Call the custom hook at the top level of your component.
• Use the returned values or functions as needed in your component.

Best Practices for Custom Hooks

Following best practices ensures your custom hooks are reliable and easy to maintain.

• Always prefix custom hook names with 'use' to follow React conventions.
• Keep hooks focused on a single responsibility.
• Avoid side effects outside of hooks like useEffect inside custom hooks.
• Document the hook’s purpose and returned values clearly.

Common Mistakes When Using Custom Hooks

Be aware of common pitfalls to avoid bugs and unexpected behavior.

• Calling hooks conditionally or inside loops breaks the rules of hooks.
• Mutating state directly inside hooks instead of using setters.
• Not cleaning up subscriptions or event listeners inside hooks.
• Using hooks outside React functional components or other hooks.