React custom hooks are reusable functions that encapsulate common logic and stateful behavior in a declarative way. Custom hooks allow you to extract stateful logic from your components into a reusable function, making your code more modular and easier to maintain.
React Custom hooks follow the same rules as other React hooks: they must start with the prefix use and can only be called at the top level of a functional component or another custom hook.
Here’s an example of a custom hook that uses the useState hook to manage a counter:
import { useState } from 'react';
function useCounter(initialValue) {
const [count, setCount] = useState(initialValue);
const increment = () => {
setCount(count + 1);
};
const decrement = () => {
setCount(count - 1);
};
return [count, increment, decrement];
}
function Counter() {
const [count, increment, decrement] = useCounter(0);
return (
<div>
<p>Count: {count}</p>
<button onClick={increment}>Increment</button>
<button onClick={decrement}>Decrement</button>
</div>
);
}
In this example, we define a custom hook useCounter that uses the useState hook to manage a counter. The useCounter hook returns an array with three elements: the count state variable, the increment function, and the decrement function.
We then use the useCounter hook in the Counter component to manage the counter state. We destructure the array returned by useCounter into count, increment, and decrement, and render these values to the screen.
By using a custom hook, we can extract the stateful logic of the counter into a reusable function that can be used in other components. This can help make our code more modular and easier to maintain.
React Custom hooks are a powerful tool in React that allow you to encapsulate stateful logic and make your code more reusable and maintainable. By using custom hooks, you can avoid code duplication and improve the readability and maintainability of your code.
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