For testing dynamic behavior in directives, such as responding to user input or changes in data, you can use _______.
- Jasmine
- Mocks
- Spies
- TestBed
To test dynamic behavior in directives, you can use Jasmine for its testing capabilities, including spies for tracking function calls.
In Angular, the _____ pipe is used to automatically update the view with the latest value emitted by an Observable.
- async
- refresh
- subscribe
- update
In Angular, the async pipe is used to automatically update the view with the latest value emitted by an Observable. It simplifies data binding.
Which method is used to submit a form in Angular?
- formSubmit()
- ngSubmit()
- postForm()
- submitForm()
In Angular, the method used to submit a form is typically ngSubmit(). It's a commonly used event handler that is triggered when a form is submitted.
How can you dynamically add a new control to a Form Array in Angular?
- formArray.addControl(control)
- formArray.createControl(control)
- formArray.insert(index, control)
- formArray.push(control)
To dynamically add a new control to a Form Array in Angular, you can use the push method, which adds the control to the end of the array.
A common practice to validate a group of related form controls is to use a custom _____ validator in Angular.
- Reactive Forms
- Reactive Forms
- Template-driven
- Template-driven
In Angular, a common practice to validate a group of related form controls is to use a custom Reactive Forms validator.
You are working on an Angular application that uses NgRx for state management. You need to implement a feature where a user action dispatches multiple actions sequentially. How would you achieve this?
- Create a custom service that manually dispatches actions in a sequential manner, and use it in your components.
- Use the mergeMap operator from RxJS to handle the sequential dispatch of actions in an effect.
- Use the pluck operator from RxJS to extract data from the store and dispatch actions sequentially.
- Use the switchMap operator from RxJS to handle the sequential dispatch of actions in an effect.
To achieve sequential dispatch of actions in an NgRx-based Angular application, you can use the mergeMap operator from RxJS within an effect. This operator allows you to handle actions sequentially and maintain the order of dispatch.
You're tasked with creating a set of UI components that can be reused in non-Angular projects, such as React or Vue.js applications. Which Angular feature would be most suitable for this task?
- Angular Directives
- Angular Elements
- Angular Modules
- Angular Services
To create UI components that can be reused in non-Angular projects, you can use Angular Elements, which allows you to package Angular components as custom elements that can be used in other frameworks like React or Vue.js.
Which core building block of Angular is responsible for defining views, data, and logic?
- Component
- Directive
- Module
- Service
In Angular, a Component is responsible for defining views, data, and logic. A Component is the basic building block of an Angular application.
When testing Angular pipes, it is crucial to test not only the transformation but also the _______ of the output.
- Behavior
- Consistency
- Performance
- Structure
When testing Angular pipes, it is crucial to test not only the transformation but also the behavior of the output to ensure correctness.
How can you protect child routes with a Route Guard in Angular?
- By using 'canActivate' Route Guard
- By using 'canActivateChild' Route Guard
- By using 'canDeactivate' Route Guard
- By using 'canLoad' Route Guard
To protect child routes in Angular, you use the 'canActivateChild' Route Guard. It allows you to guard access to child routes based on conditions.
In which of the following situations would you use an @Input() decorator in a component?
- To define local variables
- To emit custom events from the component
- To inject services into the component
- To pass data from a parent component
The @Input() decorator is used when you need to pass data from a parent component to a child component, allowing the child to receive input data.
Why is it necessary to test Angular pipes?
- To check component logic
- To ensure pipe transformations
- To validate routing
- To verify module imports
Testing Angular pipes is necessary to ensure pipe transformations are working correctly and producing the expected output in templates.