To programmatically navigate to a route with parameters, you use the _____ method of Angular's Router service.
- navigate
- navigateByUrl
- redirectTo
- toRoute
To programmatically navigate to a route with parameters, you use the navigate method of Angular's Router service.
In Angular testing, what is the purpose of the async and fakeAsync utilities?
- To execute tests in parallel
- To generate fake data for testing
- To perform static code analysis
- To simulate asynchronous operations
The async and fakeAsync utilities in Angular testing are used to simulate asynchronous operations and control the timing of tests.
You are tasked with improving the performance of an Angular application. One strategy is to split the application into smaller, feature-specific modules. How would you implement lazy loading for these modules?
- Define modules in the main application file and load them dynamically
- Manually load modules when needed
- Use Angular's loadChildren route configuration
- Use a third-party library for lazy loading
To implement lazy loading for feature-specific modules in an Angular application, you would use the loadChildren route configuration to load modules on demand.
When does a cold observable start emitting values?
- After a timeout set by the developer.
- Immediately upon creation.
- When explicitly triggered by calling a method.
- When subscribed to by at least one observer.
A cold observable starts emitting values when subscribed to by at least one observer, and each observer gets its independent sequence of values.
The Ivy Renderer’s instruction set allows Angular to be more efficient in updating the DOM by avoiding the need for a _____.
- Browser Update Cycle
- Change Detection
- Template Engine
- Virtual DOM
The Ivy Renderer’s instruction set allows Angular to be more efficient in updating the DOM by avoiding the need for Change Detection, reducing the overhead of checking for changes in the application's data and view.
How can you simulate user interactions with an element when testing a directive?
- Use ComponentFixture.nativeElement
- Use TestBed.configureTestingModule()
- Use TestBed.get()
- Use TestBed.inject()
To simulate user interactions when testing a directive, you can use the ComponentFixture.nativeElement to interact with the element.
You are implementing a multi-step form where the user can navigate between different sections before submitting the entire form. How would you manage and validate the data of this form using Angular?
- Create a separate FormGroup for each step of the form and validate individually
- Implement server-side validation to handle multi-step form data
- Use a single FormGroup for the entire form and use conditional validation rules
- Utilize Angular services to manage form data across multiple steps
In a multi-step form, it's advisable to create separate FormGroup instances for each step of the form. This allows you to manage and validate the data for each step individually, providing a better user experience.
To transform the items emitted by an Observable and emit the transformation as an Observable, you can use the _____ operator.
- map
- mergeMap
- switchMap
- transform
To transform the items emitted by an Observable and emit the transformation as an Observable, you can use the map operator in RxJS.
Which Angular class is commonly used to programmatically create form controls in a dynamic form?
- DynamicFormBuilder
- FormBuilder
- FormControl
- NgForm
In Angular, the class commonly used to programmatically create form controls in a dynamic form is the FormBuilder. It provides methods for creating form controls and groups programmatically, simplifying the process of working with forms.
For better debugging of Protractor tests, you can take advantage of _____ to take a screenshot of the browser's state when a test fails.
- afterEach
- browser.driver
- jasmine.getEnv().addReporter
- onPrepare
To take a screenshot of the browser's state when a test fails in Protractor, you can use the afterEach function, which is executed after each test spec.