- Lists are performant heavy and need to be used carefully.
- Make sure every item in the list has a unique key.
- It is preferred to not use indexes as a key unless you know for sure that the list is a static list (no additions/re-ordering/removal to the list).
- Never use unstable keys like Math.random() to generate a key.
- React will run into performance degradation and unexpected behavior if unstable keys are used.
React TL;DR – a human filter for most useful React content.