What does a service in Angular typically consist of?
- Component behavior
- Dependency Injection
- HTML and CSS
- Reusable application logic
In Angular, a service typically consists of reusable application logic, such as data manipulation, communication with servers, or shared functionality.
What is a dynamic form in Angular?
- A form that can change at runtime
- A form that changes its color
- A form that uses 3D graphics
- A form with animated transitions
In Angular, a dynamic form is a form that can change at runtime based on user interactions or application logic. It allows for flexible and customizable forms.
You are building a data table component that updates frequently. You want to minimize the performance impact of Angular's change detection mechanism on this component. How would you achieve this?
- Apply the default change detection strategy
- Increase the poll interval
- Optimize the component's HTML structure
- Use OnPush change detection strategy
To minimize the performance impact, you should use the OnPush change detection strategy, which will update the component only when its input properties change.
In Angular testing, the ______ is used to create a controlled test environment around the directive.
- ComponentFixture
- HttpClientTestingModule
- NgModule
- TestBed
In Angular testing, the TestBed is used to create a controlled test environment around the directive, allowing you to configure and set up your tests.
How does Angular Universal handle asynchronous operations like HTTP requests on the server side?
- Angular Universal doesn't handle asynchronous operations
- It blocks asynchronous operations during SSR
- It relies on client-side code to handle HTTP requests
- It uses server-side equivalents of Angular services
Angular Universal handles asynchronous operations like HTTP requests on the server side by using server-side equivalents of Angular services to make these requests.
In RxJS, to ensure that resources like subscriptions are released when an Observable completes or errors out, you can use the _____ operator.
- distinctUntilChanged
- filter
- finalize
- takeUntil
To ensure resource cleanup when an Observable completes or errors out, you can use the finalize operator in RxJS.
Which testing framework is commonly used for writing unit tests in Angular applications?
- Jasmine
- Jest
- Mocha
- Protractor
Jasmine is a commonly used testing framework for writing unit tests in Angular applications. It provides a suite of functions to create and run tests.
How can you handle errors in an Observable stream using RxJS operators?
- catchError()
- filter()
- map()
- mergeMap()
You can handle errors in an Observable stream using the catchError() operator, which allows you to catch and handle errors in the stream.
How do you access a specific form control within a Form Array in Angular?
- Using the get method
- Using the setValue method
- Using the subscribe method
- Using the valueChanges property
To access a specific form control within a Form Array in Angular, you can use the get method. It allows you to retrieve the control at a specific index.
Child routes in Angular are defined in the _____ property of a route configuration.
- childRoutes
- children
- nestedRoutes
- subRoutes
Child routes in Angular are defined in the children property of a route configuration, allowing for nested route configurations within a parent route.
You are developing an Angular application and want to make sure that the views are updated as efficiently as possible, minimizing the amount of DOM manipulation required. Which feature of the Ivy Renderer can help with this?
- Better AOT Compilation
- Enhanced Data Binding
- Improved Change Detection
- Optimized Template Compilation
The Ivy Renderer improves change detection, making it more efficient, and minimizing the amount of DOM manipulation required. This enhances the overall performance of Angular applications by reducing unnecessary updates to the DOM.
What is the primary difference between template-driven forms and reactive forms in Angular?
- Reactive forms are easier to work with for simple forms.
- Reactive forms are less flexible than template-driven forms.
- Template-driven forms rely on two-way data binding.
- Template-driven forms use a reactive approach.
The primary difference between template-driven forms and reactive forms is that template-driven forms rely on two-way data binding, while reactive forms are based on a more reactive and declarative approach using FormControl objects.