React components should be pure, not "idempotent" about react.dev

[StevenBrons]

After some Google searching, I found a few other occurrences:

• https://react.dev/reference/rules/components-and-hooks-must-be-pure
• https://react.dev/reference/rules
• https://react.dev/blog/2022/03/29/react-v18

[eps1lon]

That's the definition that's used in mathematics. In computer science, the term is somewhat ambigious. E.g. we can find the definition you used (https://foldoc.org/idempotent) but also definitions that just mean "same result if called multiple times" (https://datatracker.ietf.org/doc/html/rfc7231#section-4.2.2). Wikipedia uses the latter definition ("same result if called multiple times"): https://en.wikipedia.org/wiki/Idempotence#Computer_science_meaning

React Hooks and Components must be pure and idempotent ("same result if called multiple times"): https://react.dev/reference/rules/components-and-hooks-must-be-pure#why-does-purity-matter