In a real-time data streaming application built with Angular, you want to ensure that multiple components receive the same data from an observable without creating multiple subscriptions. What kind of observable would you use?
- AsyncSubject
- BehaviorSubject
- ReplaySubject
- Subject
To ensure multiple components receive the same data from an observable without multiple subscriptions, you would use a ReplaySubject. It replays the latest emitted value to all new subscribers.
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.
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.
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.
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.
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.
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.
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.
How do you inject a service into an Angular component?
- In the component's constructor
- Using HTML attributes
- Via @NgModule metadata
- With an external JavaScript file
You inject a service into an Angular component by including it as a parameter in the component's constructor. This allows the component to use the service's methods and properties.
To apply a function to each item emitted by an Observable, you use the _____ operator in RxJS.
- combineLatest
- pluck
- take
- tap
To apply a function to each item emitted by an Observable, you use the tap operator in RxJS. The tap operator is typically used for side effects without modifying the values emitted.