Why we should not use INDEX as KEY in React ?
Sohil Lalakiya
JAVASCRIPT | REACTJS | NODEJS | MONGODB | NETLIFY | SERVERLESS | JAVA | SPRING | PYTHON | ML
In React, the key attribute is used by the framework to uniquely identify DOM elements in a list. If a key is not specified, React may have difficulty in efficiently updating the list when new elements are added or existing ones are removed.
When a new item is added to a list, or an item is removed from the middle, the order of the remaining items may change. If the keys are not properly updated, React may wrongly assume that the DOM element represents the same component as before, even though this is not the case.
This can result in incorrect rendering or unexpected behaviour, and can even lead to performance issues. Therefore, it is important to use unique keys that can accurately identify each item in the list, especially when dealing with dynamic lists that are subject to frequent updates.
Credit: Namaste React By Akshay Saini ??
Full Stack Developer(Next + React + Express) | Jio Platforms Ltd | IIT Kharagpur(2018-22)
1 年I wrote a medium article with practical example, thank you https://medium.com/@csrinu236/why-should-not-we-use-indexes-as-keys-in-the-react-map-method-when-rendering-a-list-of-components-bcc37d8b5963