What is the use of useState in React?

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React Hooks are functions that let you use React state and lifecycle features inside functional components, without needing to write class components.

The useState hook in React is used to add state to functional components. Before hooks, only class components could manage state. With useState, functional components can store and update local data that affects rendering.

🔧 Syntax:

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const [state, setState] = useState(initialValue);

state: The current state value.

setState: A function to update the state.

initialValue: The initial value of the state.

📌 Example:

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import React, { useState } from 'react';

function Counter() {

  const [count, setCount] = useState(0);

  return (

    <div>

      <p>You clicked {count} times</p>

      <button onClick={() => setCount(count + 1)}>

        Click me

      </button>

    </div>

  );

}

🧠 How it works:

When you call setCount, React re-renders the component with the updated value.

Each time the component renders, useState returns the current state.

✅ Key Uses:

Manage local UI data (e.g., form input, toggles, counters).

Trigger re-renders when data changes.

Track component-specific data without needing a global store.

📝 Notes:

You can use multiple useState calls in one component.

Sate updates are asynchronous and queued, so updates may not reflect immediately in code right after calling setState.

In short, useState is essential for handling dynamic, interactive behavior in React functional components.

Read More

What are React hooks and why are they used?

Explain the virtual DOM in React.

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