What is the purpose of the key directive in Vue.js?

What is the purpose of the key directive in Vue.js?

The key directive in Vue.js is used to identify virtual nodes, helping Vue optimize rendering and reordering of elements.

Can you give me an example of how to use the key directive?

Sure! When rendering a list with v-for, you can use key like this: <div v-for="item in items" :key="item.id">{{ item.name }}</div>.

Why is it important to use a unique key?

Using a unique key helps Vue track elements and their state, preventing unnecessary re-renders and improving performance.

What happens if I don't use the key directive?

If you don't use the key directive, Vue may not be able to efficiently update the DOM, leading to potential bugs and performance issues.