"When rendering a list what is a key and what is it's purpose?" Code Answer's

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When rendering a list what is a key and what is it's purpose?

Tired Tapir on Feb 06, 2021

ReactDOM.render(
  <ul>{listItems}</ul>,  document.getElementById('root')
);

Source: reactjs.org

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"When rendering a list what is a key and what is it's purpose?" Code Answer's