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warning each child in a list should have a unique key prop does not disappear

Beautiful Boar answered on February 25, 2022 Popularity 3/10 Helpfulness 2/10

answer warning each child in a list should have a unique key prop does not disappear

warning each child in a list should have a unique key prop does not disappear

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// incorrect

function ListItem(props) {
  const value = props.value;
  return (
    <li key={value.toString()}>
      {value}
    </li>
  );
}

function NumberList(props) {
  const numbers = props.numbers;
  const listItems = numbers.map((number) =>
    <ListItem value={number} />
  );
  return (
    <ul>
      {listItems}
    </ul>
  );
}

// correct
  const listItems = numbers.map((number) =>
    <ListItem key={number.toString()} value={number} />
  );

Popularity 3/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: each javascript list prop unique-key

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Contributed on Feb 25 2022

Beautiful Boar

0 Answers Avg Quality 2/10

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warning each child in a list should have a unique key prop does not disappear

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