Angular Web Framework State Management & Change Detection 2

Question 1

In the Flux/Redux pattern used by NgRx, what is the single source of truth for application state?

Accepted Answer

Store

Answer

The Store is an immutable, single source of truth that holds the entire application state tree.

Question 2

Which Angular signal API creates a writable reactive value introduced in Angular 16+?

Accepted Answer

signal()

Answer

signal() creates a writable reactive primitive that Angular tracks for fine-grained change detection.

Question 3

What is the purpose of the computed() function in Angular Signals?

Accepted Answer

Derive a read-only value from one or more signals

Answer

computed() creates a lazily evaluated, memoized read-only signal derived from other signals.

Question 4

Which function converts an RxJS Observable into an Angular Signal?

Accepted Answer

toSignal()

Answer

toSignal() from @angular/core/rxjs-interop subscribes to an Observable and exposes its latest value as a Signal.

Question 5

In Angular's default change detection, what triggers the detection cycle?

Accepted Answer

Async events like DOM events, timers, and HTTP responses via Zone.js

Answer

Zone.js patches async APIs so Angular is notified whenever any async event completes, triggering a top-down change detection pass.

Angular Web Framework Practice Test