new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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Redux Toolkit · API · all subjects

type safety & patterns

2 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

Type inference pattern with makeStore

Export types for AppStore, RootState, and AppDispatch from the store file. AppStore is inferred as ReturnType<typeof makeStore>, RootState as ReturnType<AppStore['getState']>, and AppDispatch as AppStore['dispatch']. This pattern preserves type safety when using per-request store creation instead of a global store variable.

Pre-typed React-Redux hooks for Next.js

Create pre-typed versions of useDispatch, useSelector, and useStore hooks by calling their withTypes methods with the generic types. Export useAppDispatch as useDispatch.withTypes<AppDispatch>(), useAppSelector as useSelector.withTypes<RootState>(), and useAppStore as useStore.withTypes<AppStore>(). This simplifies hook usage throughout the application.

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