React and Hooks

In which version of React did Hooks add?

• 15.6
• 16
• 16.8
• 18.1

What are Hooks?

• Class components
• Function components
• Javascript functions
• Lifecycle methods

Which is not an in-build hook?

• useEffect
• useFetch
• useState
• useRef

In which phase of lifecycles do the states initialise?

• Updating
• Mounting
• Unmounting
• Both 1 and 2

Which won't cause re-render in the component?

• Changes in state
• Changes in props
• Changes in .current of useRef
• Changes in dependency array of useEffect

Which of the following is(are) correct methods to create reactJS component

• class MyComponent extends React.Component { render() { return ( <div>Demo</div> ) } }
• const MyComponent = () => { return ( <div>Demo</div> ) }
• function MyComponent = () => { return ( <div>Demo</div> ) }
• Only a
• a, b and c

We can integrate reactJS in any of the existing web app

• true
• false

ReactJS does not need HTML or any of the HTML preprocessor to make UI elements

• true
• false

Which one is valid for inline styling in reactjs

• <div style={{ backgroundColor: 'red', fontSize: '16px' }} > Hello World! </div>
• <div style={{ background-color: 'red', font-size: '16px' }} > Hello World! </div>
• <div style="background-color: red; font-size: 16px" > Hello World! </div>
• all of the above

Props can be modified in child component directly like state

• true
• false