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.
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.
You are building a component that fetches data from an API. However, you want to ensure that the component only triggers the API call when it's actually visible to the user. Which lifecycle hook can help you achieve this?
- ngAfterViewInit Lifecycle Hook
- ngDoCheck Lifecycle Hook
- ngOnDestroy Lifecycle Hook
- ngOnInit Lifecycle Hook
To ensure that the component triggers the API call when it's actually visible, you can use the ngAfterViewInit lifecycle hook, which is called after the component's view has been initialized.
Which RxJS operator is best suited for performing side effects in an Observable chain?
- filter
- map
- reduce
- tap
The tap operator in RxJS is specifically designed for performing side effects (such as logging, making API calls, or modifying data) in an Observable chain.
You are building a dashboard and have created a "UserCard" component to display user details. You want this component to display user details differently based on the type of user (Admin, Guest, Registered). Which feature of Angular components can help you achieve this without creating multiple components?
- Component Inheritance
- Content Projection
- Interpolation
- Structural Directives
In this scenario, Structural Directives like *ngIf and *ngSwitch allow you to conditionally render content within a single component, enabling you to display user details differently based on the type of user.