Imagine you're building a multi-step form and you want to navigate between steps while preserving the data entered in the form. How would you leverage Navigation Extras to achieve this?
- Pass the form data in URL query parameters using NavigationExtras
- Store form data in a shared service and access it as you navigate between steps
- Use Angular Forms Module to keep track of form data and share it between steps
- Utilize localStorage to store and retrieve form data
To navigate between steps of a multi-step form while preserving the entered data, you can leverage Navigation Extras to pass the form data in URL query parameters using the NavigationExtras provided by Angular.
How can you pass data to a route while navigating to it?
- Using route guards
- Using route parameters
- Using route resolvers
- Using the query string
You can pass data to a route while navigating to it by using route parameters. Route parameters allow you to send data directly in the URL when navigating to a specific route.
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.
The _____ testing utility in Angular helps you test code that contains asynchronous operations.
- ComponentFixture
- HttpClientTestingModule
- Karma
- TestBed
The blank should be filled with TestBed. The TestBed utility in Angular helps you set up and configure an environment for testing Angular components, services, and more.
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.