why do you have to set key prop in react
Because in that way React knows specificaly which element you want to re-render
or manipulate. With no keys, that it's impossiblewhy do you have to set key prop in react
Because in that way React knows specificaly which element you want to re-render
or manipulate. With no keys, that it's impossiblereact 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')
);Copyright © 2021 Codeinu
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