What are keys in Vue components?

What are keys in Vue components?

Keys in Vue components are unique identifiers for elements in a list. They help Vue track changes and optimize rendering.

Why are keys important for performance?

Keys help Vue identify which items have changed, been added, or removed, allowing for more efficient updates and rendering.

Can you give me an example of using keys in a Vue component?

Sure! In a v-for loop, you can use the :key directive like this: <div v-for="item in items" :key="item.id">{{ item.name }}</div>.

What happens if I don't use keys?

If you don't use keys, Vue will use the index as a key by default, which can lead to performance issues and bugs in certain scenarios.