What is the purpose of keys in React lists?

In React, keys help identify which items in a list have changed, been added, or removed. They are essential for optimizing the rendering process.

When rendering lists of elements, React uses keys to keep track of each element's identity. This allows React to minimize re-renders by efficiently updating only the components that have changed.

To implement keys, ensure that each list item has a unique identifier. Here's an example:

const items = ['Apple', 'Banana', 'Cherry'];

const ItemList = () => (
  

    {items.map((item, index) => (
      
{item}
    ))}
  
);