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What are keys in React?

Updated
1 min read
What are keys in React?

Keys help React identify which items have changed, are added, or are removed. Keys should be given to the elements inside the array to give the elements a stable identity:

const numbers = [1, 2, 3, 4, 5];
const listItems = numbers.map((number) =>
  <li key={number.toString()}>
    {number}
  </li>
);

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Raja Muhammad Asher - Senior Software Engineer - Full Stack Developer

157 posts

Full Stack Developer with a passion for building web applications. PHP, Node.js, Laravel, ExpressJS, MySQL, MongoDB. Love collaborating & making a difference