Other Hooks in React

React provides specialized built-in hooks for building reusable components and libraries. While they are used less, these hooks are important in providing library authors to create robust and user-friendly applications. Among these specialized hooks are useDebugValue and useId, that provides unique functionalities that enhance the developer experience and facilitate the creation of reusable and accessible components. In this article, we'll look into these hooks.

We will learn about the following Other Hooks in React

useDebugValue hooks

useDebugValue is a React Hook that lets you add a label to a custom Hook in React DevTools. The hook allows library authors to customize the label displayed by React DevTools for custom hooks.

Syntax:

useDebugValue(value, format?)

Parameters 

• value: The value you want to display in React DevTools. It can have any type.
• optional format: A formatting function. When the component is inspected, React DevTools will call the formatting function with the value as the argument, and then display the returned formatted value.

Return Type:

useDebugValue do not return anything.

Usage

• Adding a label to a custom Hook
• Deferring formatting of a debug value

Example: In this example, useDebugValue is used inside the useFetchData custom hook to provide debugging information about the loading status.

import React, { useState, useEffect, useDebugValue } from 'react';

const url = 'https://api.sampleapis.com/coffee/hot';

// Custom hook to fetch data and log its status for debugging
function useFetchData(url) {
    const [data, setData] = useState(null);
    const [loading, setLoading] = useState(true);

    useEffect(() => {
        async function fetchData() {
            try {
                const response = await fetch(url);
                const result = await response.json();
                setData(result);
            } catch (error) {
                console.error('Error fetching data:', error);
            } finally {
                setLoading(false);
            }
        }
        fetchData();
    }, [url]);

    // Provide debugging information about loading status
    useDebugValue(loading ? 'Loading...' : 'Data loaded');

    return data;
}

// Component using the custom hook
function App() {
    const data = useFetchData(url);

    if (!data) {
        return (
            <div style={{ display: 'flex', justifyContent: 'center', alignItems: 'center', height: '100vh' }}>
                <div style={{ fontSize: '24px' }}>Loading...</div>
            </div>
        );
    }

    return (
        <div>
            <h1>Data Loaded!</h1>
            <pre>{JSON.stringify(data, null, 2)}</pre>
        </div>
    );
}

export default App;

Output:

useId hooks

useId is a React Hook for generating unique IDs that can be passed to accessibility attributes. This hook helps components to become a unique identifier. By generating and managing unique IDs dynamically, components can enhance accessibility by ensuring proper labeling and identification, particularly for interactive elements.

Syntax:

const id = useId()

Parameters:

useId does not take any parameters.

Returns:

useId returns a unique ID string associated with this particular useId call in this particular component.

Usage

• Generating unique IDs for accessibility attributes
• Generating IDs for several related elements
• Specifying a shared prefix for all generated IDs
• Using the same ID prefix on the client and the server

Example: In this example we are providing same id's to both password and confirm password to display the same content.

import { useId } from 'react';

function PasswordField() {
    const passwordHintId = useId();
    return (
        <>
            <label>
                Password:
                <input
                    type="password"
                    aria-describedby={passwordHintId}
                />
            </label>
            <p id={passwordHintId}>
                The password should contain at least 18 characters
            </p>
        </>
    );
}

export default function App() {
    return (
        <>
            <h2>Choose password</h2>
            <PasswordField />
            <h2>Confirm password</h2>
            <PasswordField />
        </>
    );
}

Output: