What does the routerLink directive do in Angular?
- It creates a new Angular project
- It defines a component's class
- It defines a route in the application
- It displays a component in the template
The routerLink directive in Angular is used to define a route in the application. It specifies the route to navigate to when a user interacts with the element containing this directive.
How do you define a feature module in Angular?
- By using @NgModule
- By using FormsModule
- By using NgClass
- By using NgModel
To define a feature module in Angular, you use the @NgModule decorator to configure and encapsulate the components, services, and other functionality that are related to a specific feature or functionality in your application.
To optimize performance, you can set the _____ property of a component to ChangeDetectionStrategy.OnPush to make Angular check the component only when its input properties change.
- OnCheck
- changeDetectionStrategy
- detectionChangeStrategy
- ngChangeDetection
To optimize performance in Angular, you can set the changeDetection property of a component to ChangeDetectionStrategy.OnPush. This setting makes Angular check the component only when its input properties change, reducing unnecessary checks and improving performance.
When testing a pipe, you need to check if the ______ is transformed correctly to the desired output.
- Input HTML
- Input data
- Input expression
- Input function
When testing a pipe, you need to check if the input data is transformed correctly to the desired output based on the pipe's logic.
What is the main benefit of using Ivy Renderer in Angular applications?
- Better error handling
- Enhanced routing and navigation
- Faster rendering
- Improved tree-shaking
The main benefit of using the Ivy Renderer in Angular applications is faster rendering, which results in improved application performance.
What is the purpose of the setValue and patchValue methods in Angular Reactive Forms?
- They both reset the form
- They both set the entire form
- patchValue sets partial values
- setValue sets a specific value
In Angular Reactive Forms, setValue sets the entire form, while patchValue sets partial values. patchValue is commonly used to update specific form controls.
What is the difference between a BehaviorSubject and a ReplaySubject?
- A BehaviorSubject emits all previous values
- A BehaviorSubject emits the last value
- A ReplaySubject emits all previous values
- A ReplaySubject emits the last value
The key difference is that a BehaviorSubject emits only the last value upon subscription, while a ReplaySubject emits all previous values to new subscribers.
In Angular, how can you prevent the default form submission behavior of a page reload?
- Set action="javascript:void(0)"
- Use (click)="preventDefault()"
- Use (ngSubmit)="onSubmit($event)"
- Use (submit)="preventDefault()"
To prevent the default form submission behavior of a page reload in Angular, you should use (ngSubmit)="onSubmit($event)" and handle the form submission in your component.
You are building a large e-commerce application and you want to ensure that certain modules, like the Checkout module, are only loaded when the user navigates to that section. How would you achieve this?
- Dynamic import() in JavaScript to load modules asynchronously
- Lazy loading with Angular Routing
- Using Webpack code splitting during the build process
- Using ngModule imports in Angular module configurations to control module loading
In Angular, you can achieve lazy loading of modules, such as the Checkout module, using Angular Routing. It allows you to load modules on-demand when a specific route is accessed, improving performance by reducing initial load times.
How can you preload data for a route before navigating to it?
- Component resolver
- Lazy loading
- Preloading strategy
- Router pre-fetching
To preload data for a route before navigating to it, you can use a Preloading strategy. A preloading strategy allows you to load data or modules in the background so that they are available when needed.