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You will find all MCQs which are added by Fox Root
Q. Why might a team migrate from BehaviorSubject to NgRx?
Q. Which solution provides better scalability?
Q. Which solution is easier to learn for beginners?
Q. BehaviorSubject emits value to new subscriber:
Q. In NgRx, components should:
Q. Which approach has more boilerplate code?
Q. What is a major drawback of BehaviorSubject-based state management?
Q. Which approach enforces immutability?
Q. Which provides better debugging and time-travel debugging?
Q. In BehaviorSubject service, state update usually happens via:
Q. NgRx ensures state changes happen through:
Q. Which approach is more suitable for large enterprise applications?
Q. Which approach is better for small Angular applications?
Q. What is the primary difference between NgRx Store and BehaviorSubject service?
Q. In Angular, which RxJS class is commonly used in service-based state management?
Q. What problem does NgRx primarily solve?
Q. Navigation should happen after login success. Where should routing logic be placed?
Q. Which solution is used to persist store data after refresh?
Q. You refresh the browser and store data disappears. Why?
Q. Multiple components need cart data. What is correct architecture?
Q. A component needs only user name from store. What is best practice?
Q. Why should reducers not contain API calls?
Q. You need to fetch products when page loads automatically. What is the best approach?
Q. Where should loading spinner state be stored?
Q. If login API fails, what should the effect dispatch?
Q. How does the component receive updated user data after login?
Q. Which part updates the authenticated user data in the store?
Q. After successful API response in login effect, what should happen next?
Q. After a Login Action is dispatched, who listens and performs the API call?
Q. A Login button is clicked in an Angular component. What should be the FIRST step in NgRx flow?
Q. Which statement is true about reducers?
Q. Which dev tool helps debug NgRx state changes?
Q. What is a meta-reducer in NgRx?
Q. NgRx Store is most useful in which type of applications?
Q. Which function filters actions in an Effect?
Q. What does Actions stream represent in NgRx Effects?
Q. Which operator is commonly used inside Effects for API calls?
Q. What is the purpose of @ngrx/effects?
Q. Which method registers a feature store?
Q. What is Feature State in NgRx?
Q. How do you register the root store in Angular?
Q. Which package provides the StoreModule?
Q. What is the initial state in NgRx?
Q. Which helper function is used inside createReducer to handle actions?
Q. Which function is used to define an NgRx reducer in modern NgRx?
Q. Why is immutability important in NgRx?
Q. What is the Store in NgRx?
Q. NgRx Store data flow is:
Q. Which method is used to read data from the store?
Q. What does Store.dispatch() do?
Q. Which decorator is used to create an NgRx Effect?
Q. What is the role of Effects in NgRx?
Q. Which RxJS concept is heavily used by NgRx Store?
Q. Which rule must a reducer follow?
Q. Reducers in NgRx are responsible for:
Q. Which property is mandatory in every NgRx Action?
Q. In NgRx, what is an Action?
Q. Which pattern does NgRx Store follow?
Q. What is the main purpose of NgRx Store in Angular?
Q. Which operator delays emissions for a specific time?
Q. Which operator groups emitted values by a key?
Q. What is a hot Observable?
Q. What is a cold Observable?
Q. Which operator emits only when the value changes?
Q. Which operator runs inner Observables sequentially?
Q. Which operator ensures only one inner Observable runs at a time and ignores new ones?
Q. Which operator converts a Promise into an Observable?
Q. What does throttleTime() do?
Q. Which operator buffers values and emits them as an array periodically?
Q. Which operator emits pairs of previous and current values?
Q. What is the purpose of share() operator?
Q. Which operator retries the source Observable when an error occurs?
Q. Which operator repeats an Observable after completion?
Q. Which operator emits only the first value?
Q. What does combineLatest() do?
Q. Which operator emits values until another Observable emits?
Q. Which operator ignores the first n emissions?
Q. What does the reduce() operator do in RxJS?
Q. Which RxJS operator collects all emitted values into a single array when the source completes?
Q. What is the main advantage of RxJS?
Q. Which operator performs an action when the stream completes?
Q. What does of() do in RxJS?
Q. Which operator cancels the previous inner Observable?
Q. Which operator handles errors in a stream?
Q. Which creation function emits values at regular intervals?
Q. What happens when unsubscribe() is called?
Q. Which operator limits the number of emissions?
Q. Which operator merges emissions from multiple Observables?
Q. What does debounceTime() do?
Q. Which operator is commonly used for HTTP requests in Angular?
Q. Which Subject type stores the latest emitted value?
Q. Which operator combines multiple Observables and emits when all complete?
Q. What does the tap() operator do?
Q. Which operator filters emitted values based on a condition?
Q. Which RxJS operator transforms emitted values?
Q. Which method is used to start receiving data from an Observable?
Q. What is an Observable in RxJS?
Q. What is RxJS?