Angular Interview Questions For 3 Years Of Experience

 

1. What are the ways to share data between 2 components ?
2. What is lazy loading in Angular ?
3. What are custom directives in Angular and how to create them ?
4. What is the difference between ng serve and npm start ?
5. What is the difference between ng add and npm install ?
6. Can we use jQuery in Angular 2/4/5 ?
7. What is replay subject in angular ?
8. What is the difference between adding styles and scripts in angular.json and adding styles and scripts in index.html ?
9. What is the difference between cold observables and hot observables ?
10. What are the properties inside @ngModule decorator ?
11. How to generate a component using cli command without creating its spec file ?
12. What is RxJS ?
13. What is the use of HttpClientModule ?
14. Is it necessary to define a constructor in a component ?
15. What are the security features in angular ?
16. What is testbed in Jasmine ?
17. What is the difference between Subject and Behaviour Subject ?
18. What are the advantage of using observable instead of promise for http request ?
19. Difference between authorization and authentication. Explain the basic difference and also in the context of an angular application ?
20. What is AOT in Angular ?
21. How to create custom pipe in Angular ?
22. What are inbuilt Angular pipes ?
23. Explain Software version nomenclature (semantic versioning) ?
24. What is the use of tilde(~) and caret(^) sign in package.json ?
25. What are interceptors in Angular ?
26. Can we rename dist folder in Angular Project ?
27. How would the browser Know that your app is an Angular based app ?
28. How to make multiple http calls in parallel in Angular ?
29. What is a module in TypeScript, and how can you use it ?
30. How to hit an API before the loading of the appComponent ?
31. If there is a package(or say library) that is not available through NPM , then how would you use it in your angular application ?
32. How to implement treeshaking in Angular ?
33. What can be the values of 'providedIn' property of @injectable decorator ?
34. How to optimize Angular application using OnPush change detection strategy ?
35. What is the latest Angular version and what are the new features added in it ?
36. What are the types of forms available in Angular ? Explain with syntax.
37. What are dynamic forms and how to create them in Angular ?
38. How to show error messages on form controls ?
39. How to use a service only for a specific component instead of the whole module ?
40. Can you put ngIf and ngFor on same element ?
41. What's the difference between Observable and Subject ?
42. How does ng serve work ?
43. How to improve Angular app performance ?
44. What is AuthGuard in Angular ?
45. Explain the canActivateChild route guard ?
46. What is the difference between Canload and canActivate route guards ?
47. Explain switch map , mergemap , forkjoin, combineLatest, concatMap, exhaustMap . what would happen if any of the requests fails in switch map , merge map or forkjoin ?
48. What is dependency injection ?
49. What's the difference between debounce and setTimeout ?
50. What are RxJS key features ?
51. What is the difference between 'from' and 'of' operator in RxJS ?
52. How do you handle errors in RxJS observables ?
53. What is the purpose of operators in RxJS, and can you give an example of a common operator ?
54. What are services in Angular ?
55. What is the difference between AOT and JIT ?
56. What are the different building blocks of Angular ?
57. How do you use the retry() operator in RxJS, and what is its purpose ?
58. What is Angular change detection and how does it work ?
59. How to dynamically create form fields with FormArray in Angular ?
60. How to optimize an Angular application ?
61. Explain pure and impure pipe in Angular ?
62. Explain unit testing in Angular ?
63. How to test an Angular Service ?
64. Explain ngAfterContentInit hooks ?
65. Explain ngAfterViewInit hook with example ?
66. Difference between ngAfterContentInit and ngAfterViewInit ?
67. What is View Encapsulation in Angular ?
68. What is the use of polyfills ?
69. What is scan operator in RxJS ?
70. How does spyOn work in Angular ?
71. How to mock http request in Angular ?

Source: Angular Interview Questions For 3 Years Of Experience


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