React Hooks are a feature introduced in React 16.8 that allow developers to use state and other React features without writing a class component. With hooks, you can write more concise and reusable code, and share stateful logic between components.
Hooks are functions that allow you to “hook into” React state and lifecycle features from functional components. There are several built-in hooks, such as useState, useEffect, useContext, and useMemo, that you can use to manage state, perform side effects, and optimize performance.
For example, useState is a hook that allows you to add state to a functional component. You can use it like this:
import React, { useState } from 'react';
function Example() {
const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
In this example, useState is used to declare a state variable called count, and a function called setCount that can be used to update the state. The initial value of count is 0.
When the button is clicked, the setCount function is called with a new value for count, and the component re-renders with the updated state.
React Hooks allow you to write more declarative, functional code that is easier to reason about and maintain.
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