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#React Js Interview
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HA💫 Most Important ReactJS Interview Questions 🚀
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Details:
### 1. What is Reconciliation in React?
**Reconciliation** is the process React uses to update the DOM efficiently. When the state or props of a component change, React determines whether it needs to update the actual DOM. Instead of re-rendering the entire DOM, React creates a virtual representation of the DOM (Virtual DOM) and compares it with the previous version. This comparison identifies the minimum number of changes required to update the real DOM, which is then performed in a batch, resulting in optimized and faster updates.
### 2. What is Memoization and how is it used in React?
**Memoization** is an optimization technique that stores the result of a function call and returns the cached result when the same inputs occur again. In React, memoization can be used to prevent unnecessary re-renders of components. React provides the `React.memo` higher-order component (HOC) to wrap functional components. It memoizes the component’s output and only re-renders it if the props change, improving performance by avoiding redundant renders.
Example usage:
```jsx
const MyComponent = React.memo((props) => {
// Component logic here
});
```
### 3. How React Virtual DOM Works?
The **Virtual DOM** is a lightweight, in-memory representation of the real DOM. React uses it to optimize updates by minimizing direct manipulation of the actual DOM, which is costly in terms of performance. When a component’s state or props change, React creates a new Virtual DOM tree and compares it with the previous one. This process, called **diffing**, identifies the differences between the two trees. React then calculates the most efficient way to apply these changes to the real DOM, updating only the necessary parts. This approach significantly improves performance, especially in complex applications with frequent updates.
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NILet’s fix this common React mistake together 🚀
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