The useDebugValue Hook
useDebugValue Hook in React is used to display additional debug information for custom hooks in React DevTools. It’s primarily used for development purposes to provide more insights into the state or behavior of custom hooks.
Syntax:
useDebugValue(value, formatter);
- Here, ‘value‘ is the value to be displayed in the React DevTools.
- ‘formatter‘ is a function that formats the value for display in the DevTools. It’s useful for providing more informative labels or transforming the value into a more readable format.
Example: Below is an example of useDebugValue hook.
import React, {
useState,
useEffect,
useDebugValue
} from 'react';
function Gfgarticle() {
const [count, setCount] = useState(0);
// Displaying count value in React DevTools
useDebugValue(count > 0 ?
'Positive' : 'Non-positive');
useEffect(() => {
const timer = setInterval(() => {
setCount((prevCount) => prevCount + 1);
}, 1000);
return () => clearInterval(timer);
}, []);
return <div>Count: {count}</div>;
};
export default Gfgarticle;
Output:
Additional Built-in Hooks in React
Hooks are functions that allow you to “hook” into the state of a component and provide additional features to ensure the lifespan of functional components. These are available in React versions 16.8.0 and higher. however, we previously used to describe them using classes.
We will discuss the various Additional Built-in Hooks:
Table of Content
- The useReducer hook
- The useRef hook
- The useCallback Hook
- The useMemo Hook
- The useLayoutEffect Hook
- The useImperativeHandle Hook
- The useDebugValue Hook
- Conclusion