Useeffect react hook in next.js | React hooks | Next.js tutorial in hindi
The `useEffect` hook in React allows you to perform side effects in functional components. It is similar to the lifecycle methods in class components. The `useEffect` hook takes a callback function as its first parameter, which contains the code to run as a side effect. It also accepts an optional dependency array as its second parameter, which specifies the variables or values that trigger the effect.
The `useEffect` hook is used to handle tasks like fetching data, subscribing to events, and manipulating the DOM. It has a wide range of applications in managing side effects within functional components.
To use the `useEffect` hook, you define the callback function with the desired side effect and provide it as the first parameter to `useEffect`. If you want the effect to run only once, you can pass an empty dependency array. If you want the effect to run whenever a specific value changes, you include that value in the dependency array.
Additionally, you can return a cleanup function within the callback function to handle any necessary cleanup when the component unmounts or when the dependencies change.
Overall, the `useEffect` hook is a powerful tool for managing side effects in React functional components and helps to keep your code organized and efficient.
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