REACT JS

What is React JS?

• A JavaScript library for building user interfaces
• A Python framework for web development
• A CSS preprocessor
• A database management system

Which of the following is used to pass data from parent to child?

• State
• Props
• Lifecycle Methods
• Hooks

JSX stands for?

• JavaScript XML
• JavaScript Xtra
• Java Standard XML
• JavaScript Xtra Functions

React's useState hook returns an array of how many elements?

• 1
• 2
• 3
• 4

Which hook is used for side effects in function components?

• useEffect
• useState
• useContext
• useReducer

Fragment in React is mainly used for __________.

• Styling components
• Grouping multiple elements
• Making network requests
• Managing state

Which of these is a way to implement CSS in a React component?

• Inline styles
  

• CSS-in-JS libraries
  

• Importing CSS file

• All of the above
  

Which JavaScript method is used to iterate over an array and return a new array based on some criteria?

• push()
• pop()
• filter()
• shift()

How would you store an array in a React functional component's state?

• Using the useState hook
• Using the setState method
• Using the this.state property
• Using the props object

When you call useState, what does the first value in the returned array represent?

• The current state value
• The initial state value
• The function to update the state
• The state's previous value