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He is not using it incorrectly:

https://en.wikipedia.org/wiki/Idempotence#Computer_science_m...

React views are idempotent. They are not necessarily pure (though they can be).

Don't they have to be pure in order to be idempotent? If you might get a different virtual DOM even when props/state are unchanged (not pure), then re-rendering the component might update the DOM even when props/state are unchanged (not idempotent).

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