/Javascript/React/React component key prop

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')
);

Source: reactjs.org

Similar codes

78 votes236 views6 answers
React router redirect
Javascript React
2 votes263 views2 answers
React native scrollview map
Javascript React
8 votes206 views4 answers
Get react version
Javascript React
1 vote190 views1 answer
Reactjs compile subdomine
Javascript React
0 vote229 views1 answer
What was the reaction of others bostonh tea party
Javascript React
0 vote188 views1 answer
Ts(2749) react testing library
Javascript React
0 vote220 views1 answer
React function runs several times
Javascript React
1 vote242 views1 answer
Two proptypes in react
Javascript React
105 votes270 views1 answer
React web app create
Javascript React
0 vote193 views1 answer
Set default types react
Javascript React