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.
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.
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.
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.
A cold observable starts emitting values only when it has at least one subscriber.
- delayed
- hot
- multicasting
- synchronous
A cold observable starts emitting values only when it has at least one subscriber.
What is the main purpose of Angular's change detection mechanism?
- Detecting runtime errors
- Keeping the view in sync
- Managing server requests
- Monitoring file changes
The main purpose of Angular's change detection mechanism is to keep the view in sync with the application's data, ensuring that updates are reflected in the user interface.
In what scenario would you use the ResolveEnd Router Event?
- For capturing the start of navigation
- For handling navigation errors
- For intercepting route changes
- For triggering preloading strategies
The ResolveEnd Router Event is used for intercepting route changes and executing code when a route is resolved.
What is the primary advantage of using the async pipe in Angular templates?
- Automatically unsubscribes
- Efficiently manage memory resources
- Enables two-way data binding
- Simplifies handling HTTP requests
The primary advantage of using the async pipe is that it automatically unsubscribes from the Observable when the component is destroyed, preventing memory leaks.
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.
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.