[Medium] 📄 Best Practices

1. Why you shouldn't use index as a key in lists and iterators?

為什麼不應該使用 index 作為 key 值？

在 Vue, React 等框架的面試題目中都會有類似的題目：

• What happens if there is no key in v-for?
• Why you shouldn't use index as a key in React lists and iterators?