Creating Custom Hooks in React

Creating a Simple Custom Hook

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

This hook will use useState to store the width and useEffect to add and clean up the event listener.

Using the Custom Hook in a Component

You can use the custom hook inside any functional component to access the window width without duplicating logic.

This keeps your components clean and focused on rendering.

Best Practices for Custom Hooks

Follow these guidelines to write effective custom hooks.

• Always start the hook name with 'use' to comply with React rules.
• Keep hooks focused on a single responsibility.
• Avoid side effects outside of useEffect inside your hooks.
• Return only the necessary data or functions.
• Document your hooks clearly for reuse.

Common Mistakes When Creating Custom Hooks

Be aware of these pitfalls to avoid bugs and confusion.

• Not prefixing the function name with 'use' causes React to ignore hook rules.
• Calling hooks conditionally inside your custom hook breaks the rules of hooks.
• Returning too much data or unrelated logic reduces reusability.
• Not cleaning up side effects properly can cause memory leaks.