react component key prop

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1function ListItem(props) {
2  // Correct! There is no need to specify the key here:  return <li>{props.value}</li>;}
3
4function NumberList(props) {
5  const numbers = props.numbers;
6  const listItems = numbers.map((number) =>
7    // Correct! Key should be specified inside the array.    <ListItem key={number.toString()} value={number} />  );
8  return (
9    <ul>
10      {listItems}
11    </ul>
12  );
13}
14
15const numbers = [1, 2, 3, 4, 5];
16ReactDOM.render(
17  <NumberList numbers={numbers} />,
18  document.getElementById('root')
19);

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