What are hooks in NextJS

In React (and therefore, Next.js), a "hook" is a way to use state and other React features without writing a class component. Hooks allow you to "hook into" React state and lifecycle methods from functional components.

Here are some built-in hooks in React:

• useState: Creates a state variable and an update function.
• useEffect: Allows you to run side effects (e.g., making API calls) after rendering.
• useContext: Provides access to context objects, like a theme or a user object.
• useReducer: Similar to useState, but with more features for managing complex state.
• useCallback: Memoizes a function so that it's not recreated on every render.
• useMemo: Memoizes a value so that it's not recalculated on every render.

To use these hooks, you can simply import the React library and then use them in your functional component:

import React, { useState } from 'react';
 
function MyComponent() {
  const [count, setCount] = useState(0);
 
  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={() => setCount(count + 1)}>Increment</button>
    </div>
  );
}

In this example, we're using the useState hook to create a state variable count and an update function setCount. We can then use these in our component.

These built-in hooks are part of React's core functionality, so you don't need to install any additional libraries to use them.