React has some knowledge of a given component through the use of `createElement` (or its JSX equivalents), so it's not even using global variables. https://rea

React has some knowledge of a given component through the use of `createElement` (or its JSX equivalents), so it's not even using global variables. https://reactjs.org/docs/hooks-faq.html#how-does-react-associate-hook-calls-with-components https://reactjs.org/docs/hooks-faq.html#how-does-react-assoc... The "memory cells" the FAQ mentions sounds awfully like a map structure where React uses some internal identifier generated on first render to map any state handlers. The only "magic" bit is that it relies on the order of the `use` calls to be the same every time.