All hooks are based on useReducer. Whenever a component is rendered React sets a global (!) variable for the current component. They didn't even bother to have

All hooks are based on useReducer. Whenever a component is rendered React sets a global (!) variable for the current component. They didn't even bother to have the component be a parameter into the hook to get rid of the global variable. No, it must be pretentious and claim to be something it isn't. The global variable stores a linked list with the hook data. The calling order of your hooks matters.