NgRx quiz

Test your NgRx knowledge with a free interactive quiz — 21 questions with answers and explanations. No signup needed to play.

Why are selectors typically memoized with `createSelector`?

1. Why are selectors typically memoized with `createSelector`?
2. What is `createFeature` used for in modern NgRx?
3. Why is it considered a bad practice for an NgRx reducer to call an HTTP service directly?
4. When is reaching for the full NgRx Store (actions/reducers/effects/selectors) generally the right call, versus using component-local state or a service with a simple `BehaviorSubject`?
5. What does `@ngrx/router-store` provide?
6. Why would a large list of records typically be stored "normalized" (as an ids array plus an entities lookup dictionary) rather than as a plain array in the store?
7. What is the single source of truth in an NgRx application?
8. How does `@ngrx/store-devtools` help during development?
9. What is NgRx?
10. What is a "selector" in NgRx?
11. What is `@ngrx/entity` used for?
12. What is an NgRx "action"?

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