/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

5 votes154 views2 answers
Get url query in react
Javascript React
8 votes173 views3 answers
React Lazy()
Javascript React
0 vote195 views3 answers
Redirect is not defined react/jsx-no-undef
Javascript React
-1 vote184 views4 answers
React tutorial
Javascript React
0 vote189 views1 answer
React date component with word month
Javascript React
8 votes162 views2 answers
Useref in react typescrpt
Javascript React
6 votes174 views2 answers
UseHistory react-router-dom
Javascript React
0 vote174 views1 answer
React-native-error-check-the-render-method-of-app
Javascript React
9 votes165 views5 answers
How to add array data on state react
Javascript React
2 votes167 views2 answers
How to change react icon color
Javascript React