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ReactJS - Quiz(MCQ)
How do you invoke setDone only when component mounts, using hooks?
function MyComponent(props) {
  const [done, setDone] = useState(false);

  return <h1>Done: {done}</h1>;
}
A)
useEffect(() => { setDone(true); });​
 
B)
useEffect(() => { setDone(true); }, []);
C)
useEffect(() => { setDone(true); }, [setDone]);
D)
useEffect(() => { setDone(true); }, [done, setDone]);

Correct Answer :   

useEffect(() => { setDone(true); }, [setDone]);

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>;
  }
}
A)
Remove this
B)
Capitalize clock
C)
Remove the render method
D)
Add quotes around the return value

Correct Answer :   Capitalize clock

Q .
Which Hook could be used to update the document's title?
A)
useEffect(function updateTitle() { document.title = name + ' ' + lastname; });
B)
useEffect(() => { title = name + ' ' + lastname; });
C)
useEffect(function updateTitle() { name + ' ' + lastname; });
D)
useEffect(function updateTitle() { title = name + ' ' + lastname; });

Correct Answer :   

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