What is a directive in Angular?
- A behavior added to DOM
- A component template
- A module definition
- A route configuration
In Angular, a directive is a behavior added to the Document Object Model (DOM) to extend its functionality. Directives are a way to create reusable components and add dynamic behavior to elements.
When debugging a failing Protractor test, what tool can you use to pause the test execution and inspect the browser's state?
- Browser developer console
- Node.js debugger (e.g., DevTools)
- Protractor's built-in debugger
- WebDriver's built-in debugger (WDB)
When debugging a failing Protractor test, you can use the Node.js debugger, such as Chrome DevTools, to pause the test execution and inspect the browser's state.
To create an Observable that immediately completes without emitting any values, you can use the _____ function.
- create
- empty
- interval
- of
To create an Observable that immediately completes without emitting any values, you can use the empty function.
How does the merge operator behave when combining multiple Observables?
- It combines the latest values from all Observables.
- It emits values from all Observables as they arrive.
- It emits values from the first Observable only.
- It waits for all Observables to complete before emitting values.
The merge operator in RxJS emits values from all Observables as they arrive, without waiting for them to complete.
What is the purpose of using the resolve property in Angular routing?
- Define route aliases
- Load data before activating
- Preload lazy-loaded modules
- Redirect to a default route
The purpose of using the resolve property in Angular routing is to load data before activating a route, ensuring that data is available for the component.
What is the main advantage of using a Subject over a standard Observable?
- Subjects allow multicasting
- Subjects are faster in emitting values
- Subjects are more memory-efficient
- Subjects provide better error handling
The primary advantage of using a Subject over a standard Observable is that Subjects allow multicasting, making it possible to share values with multiple subscribers.
What would you use to ensure that a route is only accessible to authenticated users?
- CanActivate guard
- Route event emitter
- Route resolver
- Router outlet
To ensure that a route is only accessible to authenticated users, you would use a CanActivate guard. CanActivate guards can be used to implement authentication and authorization checks before allowing access to a route.
How does the Ivy Renderer's instruction set contribute to improved performance in Angular applications?
- Enables Ahead-of-Time (AOT) compilation
- Minimizes network requests
- Optimizes the rendering process
- Reduces JavaScript bundle size
The Ivy Renderer's instruction set in Angular contributes to improved performance by optimizing the rendering process, resulting in faster component rendering.
What is the primary purpose of End-to-End (E2E) testing in an Angular application?
- Test Angular services
- Test individual components
- Test server-side logic
- Test the user interface
The primary purpose of E2E testing in an Angular application is to test the user interface to ensure that all parts of the application work together as expected.
How can you share a single Observable execution between multiple subscribers?
- Using the filter() operator
- Using the map() operator
- Using the mergeMap() operator
- Using the share() operator
You can share a single Observable execution between multiple subscribers by using the share() operator. This allows multiple subscribers to share the same execution and results of the Observable.