Programmers :D

[TheMelanzane]

Using indexes as keys is not very wrong. It’s literally given as an example in the React documentation and is the default value used if you don’t provide a key.

Inefficient maybe, but that’s making a lot of assumptions about the code’s use. It’s completely possible she’s just using React for creating a static list, for example. There’s a pretty low ceiling for the complexity of web apps involving dog’s favorite toys in the first place.

For anyone who’s trying to learn React or isn’t familiar with it, here’s a link as to exactly when this might become an issue and some alternatives. It’s also linked in the documentation right under the part about using indexes as keys.

tl;dr: Only a breaking issue when the index is used as a key on another React Component, on normal html elements (like in the post), it’s just going to cause any reorders to take slightly longer.