Angular Web Framework Cheat Sheet 2026

The 30 highest-yield Angular Web Framework facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. In a web browser, how would you display dates? → Use the Angular pipe class in the template
2. Which Angular strategy checks only the current component and its ancestors when an input reference changes? → OnPush
3. Which Angular signal API creates a writable reactive value introduced in Angular 16+? → signal()
4. Which applications must be installed before you can download Angular? → Node.js
5. Which Angular feature delays loading a module until a user navigates to its associated route? → Lazy loading
6. What is the purpose of the computed() function in Angular Signals? → Derive a read-only value from one or more signals
7. What methods would you use to test your NativeScript Angular app? → Run it in a web-browser
8. What is the purpose of the Validators class? → Provides built-in validation functions like required, minLength, maxLength, and pattern
9. What does 'providedIn: root' mean in an @Injectable() decorator? → The service is available application-wide as a singleton through the root injector
10. What is the @Output() decorator and EventEmitter used for? → To emit custom events from a child component to its parent
11. What are structural directives in Angular? → Directives like *ngIf and *ngFor that change the DOM layout by adding or removing elements
12. How do you create a custom validator in Angular? → By writing a function that returns null for valid or an error object for invalid input
13. In the Flux/Redux pattern used by NgRx, what is the single source of truth for application state? → Store
14. In a web application, how would you create custom event handling? → Through a combination of Outputs Decorators and EventEmitters
15. What is the purpose of the Angular CLI command `ng build --configuration production`? → Compiles the app with optimizations like minification and tree-shaking
16. What does calling markForCheck() on a component using OnPush change detection do? → Marks the component and its ancestors to be checked on the next cycle
17. How do you pass query string parameters to an HttpClient.get() request in Angular? → Use the params option with an HttpParams object or plain object
18. Which HttpClient request option causes it to return the full HTTP response including status code and headers? → observe: 'response'
19. How do you make an HTTP request that bypasses all registered HttpInterceptors? → Inject HttpBackend directly and use it to dispatch the request
20. In Angular's default change detection, what triggers the detection cycle? → Async events like DOM events, timers, and HTTP responses via Zone.js
21. In an Angular application, where would you put routing URL information? → Use ngStyle from within the template
22. Which Angular directive efficiently re-renders only changed items in a list by tracking identity? → *ngFor with trackBy
23. What is a service in Angular? → A class with a focused purpose that provides shared functionality across components
24. What does the on() helper inside createReducer() do? → Registers a case handler for a specific action type
25. What is the difference between a Subject and an Observable? → A Subject is both an Observable and an Observer — it can emit values and be subscribed to
26. What is the difference between a service and a component in Angular? → Components manage UI and views; services contain reusable business logic and data access
27. What NgRx operator is used inside createEffect() to handle errors without killing the effect stream? → catchError with EMPTY or of()
28. What ethical standards guide Angular professionals in their work? → Integrity, objectivity, confidentiality, and professional competence in all engagements
29. In a FormControl, how would you implement objects? → By specifying start and tags
30. What does the pipe() method do in RxJS? → Chains multiple operators together to transform, filter, or combine Observable streams