The _____ operator can be used to combine multiple Observables, emitting values sequentially in the order they were provided.
- forkJoin
- mergeMap
- switchMap
- zip
The mergeMap operator can be used to combine multiple Observables, emitting values sequentially in the order they were provided. It's often used for HTTP requests.
To create a custom pipe in Angular, you need to decorate a class with the _____ decorator.
- @Component
- @Injectable
- @NgModule
- @Pipe
To create a custom pipe in Angular, you need to decorate a class with the @Pipe decorator. This decorator is used to define a custom pipe.
Custom directives in Angular can be used to extend the behavior of _____.
- components
- directives
- modules
- services
Custom directives in Angular can be used to extend the behavior of directives. Directives are a fundamental part of Angular and provide the ability to create custom behaviors and interactions that can be added to elements in the DOM. Custom directives enable developers to create reusable functionality.
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 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 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.
In Angular, the _____ directive is used to conditionally render content in the DOM.
- *ng-if
- *ng-if-else
- *ng-show
- *ng-switch
In Angular, the *ng-if directive is used to conditionally render content in the DOM based on a provided condition.
What kind of behavior is typically tested in a custom Angular directive?
- Component rendering
- Component routing
- Directive behavior
- Module imports
In Angular, custom directives are typically tested to validate their directive behavior and ensure they manipulate the DOM as intended.
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.
You are tasked with building a form that needs to validate the password and confirm password fields are the same. How would you approach implementing this validation?
- Built-in Angular validation
- None of the above
- Perform validation in the template
- Use a custom validator function
To validate that the password and confirm password fields are the same, you should use a custom validator function to implement custom validation logic.