In a dynamic form, to validate data asynchronously on the server-side, you can use a custom _____ validator.
- AsyncValidatorFn
- ObservableValidator
- SyncValidatorFn
- ValidatorFn
In a dynamic form in Angular, to validate data asynchronously on the server-side, you can use a custom AsyncValidatorFn.
What is a Subject in the context of RxJS?
- A design pattern for components
- A special type of Observable
- A type of HTTP request
- An operator for filtering Observables
In RxJS, a Subject is a special type of Observable that allows values to be multicasted to multiple Observers. It can act as both an Observable and an Observer, making it useful for pub-sub patterns.
In an Angular application, you want to create an animation where an element fades in and then scales up. Which Angular animation functions would you use to create this effect?
- Use animate() and style() functions in combination to define keyframes for both fading in and scaling up within the animation.
- Use fadeIn() and scaleUp() functions provided by Angular's animation module to create the desired animation effect.
- Use ng-animate directive and CSS classes for fading in and scaling up the element within the animation.
- Use ng-animate-fade-in and ng-animate-scale-up directives to apply the desired animations to the element.
To create an animation in Angular where an element first fades in and then scales up, you can use the animate() and style() functions in combination. These functions allow you to define keyframes for both fading in and scaling up within the animation, achieving the desired effect.
What is the purpose of the next() method in a Subject?
- Complete an Observable
- Emit a new value
- Handle errors in an Observable
- Subscribe to an Observable
The purpose of the next() method in a Subject is to emit a new value to all the subscribers of the Subject. It is used to push new data to the observers.
For a directive to be used across multiple modules, it needs to be declared in a shared module and exported using the ________ array.
- declarations
- exports
- imports
- providers
To use a directive across multiple modules, it should be declared in a shared module and exported using the exports array.
How can you create a custom operator in RxJS?
- Create a new Observable class
- Extend the Observable class
- Implement a Promise-based approach
- Use the pipe method
To create a custom operator in RxJS, you should use the pipe method to compose existing operators and functions to form your custom operator.
To wait for Angular to finish rendering before executing the next command in a Protractor test, you can use _____.
- browser.pause()
- browser.sleep()
- browser.waitForAngular()
- browser.waitForRender()
To wait for Angular rendering in a Protractor test, you can use browser.waitForAngular(), which ensures synchronization with Angular.
Which directive is used to create a form control in template-driven forms?
- FormControl
- FormGroup
- ngForm
- ngModel
In template-driven forms, the ngModel directive is used to create a form control. It binds form elements like input fields and selects to properties in the component class, allowing two-way data binding.
To restrict access to child routes based on user roles, you can implement a custom _____ Guard.
- authentication
- canActivate
- canDeactivate
- role
To restrict access based on user roles, you can implement a custom canActivate Guard. A Guard like this checks whether the user has the required role to access the route.
Which NgRx library function is used to define actions in a state management setup?
- createAction
- createEffect
- createFeatureSelector
- createReducer
In NgRx, the function used to define actions in a state management setup is createAction. Actions are a crucial part of state management, representing events that can change the application's state.
How can you bind an image source dynamically in an Angular template?
- (img) element binding
- [imageSrc] property binding
- [src] attribute binding
- {{ imgSrc }}
In an Angular template, you can bind an image source dynamically using the [src] attribute binding to set the image source from a variable.
In reactive forms, the _____ operator is often used to transform and process form values before submission.
- map()
- reset()
- submit()
- updateValueAndValidity()
In reactive forms, the map() operator is often used to transform and process form values before submission, typically in combination with RxJS.