React state refers to the current state of a component in a React application. It is used to store and manage dynamic data, and when the state changes, the component is re-rendered to reflect the new state. State is often used to handle user interaction, inputs, and changes within the application.
In order to use state in a React component, you typically need to declare it using the useState hook, which was introduced in React 16.8. The useState hook takes an initial value for the state and returns an array containing the current value of the state and a function to update it.
For example, if you wanted to store a user's name in the state of a component, you might use the following code:
import React, { useState } from 'react';
function UserComponent() {
const [name, setName] = useState('John Doe');
return (
<>
<p>Hello, {name}!</p>
<input
type="text"
value={name}
onChange={(e) => setName(e.target.value)}
/>
</>
);
}
In this example, the useState
hook is used to declare the name
state variable with an initial value of 'John Doe'. The setName
function is used to update the value of name
when the user types in the input field. The component is re-rendered each time the state changes, causing the Hello, {name}!
text to update dynamically.
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