/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

0 vote177 views1 answer
Scroll load react
Javascript React
18 votes187 views6 answers
Export apk react native
Javascript React
1 vote169 views1 answer
Typeerror object(...) is not a function react useParams
Javascript React
1 vote194 views2 answers
React beforeunload
Javascript React
0 vote186 views1 answer
Preview image before upload reactjs
Javascript React
136 votes248 views6 answers
Create a react app
Javascript React
15 votes172 views2 answers
Link reload page react
Javascript React
0 vote189 views1 answer
React router not working with aws amplify
Javascript React
15 votes182 views8 answers
React bootstrap
Javascript React
0 vote190 views1 answer
Remove unused dependencies in React Ask Question
Javascript React