React JS Knowledge Quiz

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Questions and Answers

What is the primary purpose of the useState hook in React?

  • To manage state changes in a component (correct)
  • To create a new React component
  • To handle side effects in a component
  • To optimize the performance of a component

React Hooks can only be used in class components.

False (B)

What is the purpose of the key prop in a React component?

To help React keep track of items in a list and improve performance.

The jsx syntax is used to write React components in a _______ way.

<p>declarative</p> Signup and view all the answers

Match the following React lifecycle methods with their purpose:

<p><code>componentDidMount</code> = Called when the component is mounted to the DOM <code>componentWillUnmount</code> = Called when the component is about to be unmounted from the DOM <code>render</code> = Called when the component is rendered to the DOM <code>shouldComponentUpdate</code> = Called when the component's props or state change</p> Signup and view all the answers

What is the main difference between a controlled and uncontrolled component in React?

<p>A controlled component's value is managed by the state, whereas an uncontrolled component's value is managed by the DOM.</p> Signup and view all the answers

How does React's Virtual DOM improve the performance of a React application?

<p>React's Virtual DOM improves performance by only re-rendering the components that have changed, reducing the number of DOM mutations and resulting in faster rendering.</p> Signup and view all the answers

What is the purpose of the shouldComponentUpdate lifecycle method in React?

<p>The <code>shouldComponentUpdate</code> method determines whether a component should re-render when its props or state change.</p> Signup and view all the answers

What is the difference between a functional component and a class component in React?

<p>A functional component is a pure function that takes in props and returns JSX, whereas a class component is a class that extends the React Component class and has its own lifecycle methods.</p> Signup and view all the answers

How does React's context API help in sharing data between components?

<p>React's context API helps in sharing data between components by providing a way to share data between components without having to pass props down manually.</p> Signup and view all the answers

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