Why is it important to avoid copying the values of props into a component's state where possible?

ReactJS - Quiz(MCQ)

because you should never mutate state

because you want to allow data to flow back up to the parent

because getDerivedStateFromProps() is an unsafe method to use

because you want to allow a component to update in response to changes in the props

Correct Answer : because you want to allow a component to update in response to changes in the props

Recent Updates in React.JS

Q .

What do you need to change about this code to get it to run?

class clock extends React.Component {
  render() {
    return <h1>Look at the time: {this.props.time}</h1>;
  }
}

Remove this

Capitalize clock

Remove the render method

Add quotes around the return value

Correct Answer : Capitalize clock

Q .

Which Hook could be used to update the document's title?

useEffect(function updateTitle() { document.title = name + ' ' + lastname; });

useEffect(() => { title = name + ' ' + lastname; });

useEffect(function updateTitle() { name + ' ' + lastname; });

useEffect(function updateTitle() { title = name + ' ' + lastname; });

Correct Answer :

useEffect(function updateTitle() { document.title = name + ' ' + lastname; });