ReactJS Loops best practices // Array Index as Key considered harmful

In this ReactJS lesson, we break down when it's okay to use an index as a key and when it is completely not okay ... and the grey area in between 🌹

Course Page (Professional ReactJS):
https://www.booleanart.com/course/react

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Chapters
0:00 Intro
0:13 No Key Example
0:51 Impure Components
1:30 Pure Components
1:58 Index as Key
2:56 Data-driven Keys
3:59 Pure Component Performance
5:17 Outro

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