What is the virtual DOM in React?
Asked on Sep 23, 2024
Answer
The virtual DOM in React is a lightweight, in-memory representation of the actual DOM. React uses it to optimize updates by minimizing direct manipulation of the real DOM, which can be slow.
// Example of React component using virtual DOM
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>
);
}
export default Counter;Additional Comment:
✅ Answered with JavaScript best practices.- React keeps a virtual DOM to efficiently update the real DOM.
- When state changes, React creates a new virtual DOM tree.
- React compares this new tree with the previous one (a process called "reconciliation").
- Only the differences are updated in the real DOM, improving performance.
- This approach is particularly beneficial for complex UIs with frequent updates.
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