You want to create a feature state slice for user profiles using NgRx. Which combination correctly sets up the feature state and selector?

hard📝 Application Q15 of 15

Angular - State Management

1. Define interface UserProfileState { name: string; age: number; }
2. Create reducer userProfileReducer
3. Register feature state with key 'userProfile'
4. Select user name from store

Which code snippet correctly selects the user name?

const selectUserProfile = createFeatureSelector<UserProfileState>('userProfile');
const selectUserName = createSelector(selectUserProfile, state => state.name);

Bconst selectUserName = createSelector('userProfile', state => state.name);

Cconst selectUserProfile = createSelector('userProfile'); const selectUserName = state => state.name;

Dconst selectUserName = createFeatureSelector<UserProfileState>('userProfile').pipe(map(state => state.name));

Step-by-Step Solution

Solution:

Step 1: Understand feature selector usage
Use createFeatureSelector with the feature key to get the feature state.
Step 2: Create selector for user name
Use createSelector with the feature selector and a projector function to select the name.
Final Answer:
const selectUserProfile = createFeatureSelector('userProfile'); const selectUserName = createSelector(selectUserProfile, state => state.name); -> Option A
Quick Check:
Feature selector + createSelector = correct pattern [OK]

Quick Trick: Use createFeatureSelector then createSelector for nested state [OK]

Common Mistakes:

Passing string directly to createSelector
Using pipe on selector instead of RxJS operators in component

Master "State Management" in Angular

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Perf

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More Angular Quizzes

You want to create a feature state slice for user profiles using NgRx. Which combination correctly sets up the feature state and selector?

Step 1: Understand feature selector usage

Step 2: Create selector for user name

Final Answer:

Quick Check:

Want More Practice?