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Angular 8 Interview Questions and Answers

Ques 31. Explain the purpose of zone.js in Angular.

Zone.js is a library that helps Angular with change detection. It provides a context for JavaScript execution and allows Angular to know when asynchronous operations, such as HTTP requests or timers, are completed. This knowledge triggers the change detection process.

Example:

import 'zone.js/dist/zone';

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Ques 32. What is the Angular TestBed used for in testing?

The TestBed in Angular testing is a configuration and testing utility that provides methods for configuring and creating testing modules. It is used to create a controlled environment for testing Angular components, services, and other constructs.

Example:

TestBed.configureTestingModule({
  declarations: [AppComponent],
  providers: [DataService],
});

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Explain Angular modules.