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Question: Can you explain the difference between 'React.forwardRef' and 'ReactDOM.createRef' in React?
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Answer: You can find the difference below:
• React.forwardRef: This function allows functional components to pass a ref received from a parent component down
to a child DOM element or another component. It is typically used when the child component needs to imperatively access
or manipulate the DOM element.
• 'ReactDOM.createRef:' This function is used to create a ref object that can be attached to a DOM element
in a class component. It is useful for accessing or manipulating the DOM element imperatively
within the class component's methods.
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Question: Can you explain the benefits of using React Router for routing in React applications?
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Answer: Beloiw please find some of the benefits:
• Declarative routing: React Router allows developers to define routes using JSX components,
making routing logic more readable & maintainable.
• Nested routing: React Router supports nested routes, enabling developers to create complex
routing structures with nested views and layouts.
• Dynamic routing: React Router supports dynamic routing, allowing developers to pass parameters
and query strings to route components for dynamic content generation.
• History management: React Router provides history management features for browser navigation,
including support for browser history API and programmatic navigation.
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Question: Can you explain the concept of virtual DOM in React and how it improves performance?
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Answer: The virtual DOM is a lightweight copy of the actual DOM maintained by React. When changes are made
to the UI, React first updates the virtual DOM rather than directly manipulating the actual DOM.
React then compares the virtual DOM with the previous virtual DOM snapshot to determine the minimal set of changes
needed to update the actual DOM.
This process, known as reconciliation, helps reduce the number of DOM manipulations and improves performance by
efficiently updating only the parts of the DOM that have changed.
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Question: Can you explain the concept of 'props drilling' in React and how it can be mitigated?
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Answer: The 'props drilling' refers to the process of passing props down multiple levels of nested components,
which can lead to code verbosity and complexity.
It can be mitigated using techniques like context or state management libraries such as Redux.
Context allows passing data through the component tree without manually passing props at each level,
while Redux provides a centralized state management solution that can be accessed from any component..
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Question: What is the difference between React.memo and React.PureComponent?
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Answer: Please find the difference below:
• React.memo: The React.memo is a higher-order component used to memoize functional components.
It memoizes the result of the component rendering, preventing unnecessary re-renders if the component's props have not changed.
• React.PureComponent: The React.PureComponent is a class component that performs a shallow comparison
of props and state to determine whether a re-render is necessary. It is similar to React.memo but works with class components
instead of functional components.
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Question: Can you explain the purpose of the 'useCallback' hook in React?
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Answer: The 'useCallback' hook in React is used to memoize callback functions, preventing unnecessary
re-creation of the callback on re-renders.
It takes a callback function and an array of dependencies and returns a memoized version of the function.
The useCallback is useful for optimizing performance in scenarios where callback functions are passed as
dependencies to other hooks or components.
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