[AgentME]

JSX doesn't have loops. When using React, you use regular not-React-specific Javascript tools to do loops and create lists of React elements.

[t_tsonev]

If this is true, why do you need unique item keys? React cares about loops a lot more than it may seem at a first look.

[sbergot]

keys are not specific to loops. They are needed whenever you are returning a react document with a dynamic structure. They allow for more fine grain dom updates.