react component key prop
function ListItem(props) {
// Correct! There is no need to specify the key here: return <li>{props.value}</li>;}
function NumberList(props) {
const numbers = props.numbers;
const listItems = numbers.map((number) =>
// Correct! Key should be specified inside the array. <ListItem key={number.toString()} value={number} /> );
return (
<ul>
{listItems}
</ul>
);
}
const numbers = [1, 2, 3, 4, 5];
ReactDOM.render(
<NumberList numbers={numbers} />,
document.getElementById('root')
);