Bootstrapping with standalone in Angular - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to bootstrap an Angular standalone component.

Angular

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';

bootstrapApplication([1]);

Drag options to blanks, or click blank then click option'

AComponent

BNgModule

CBrowserModule

DAppComponent

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a module instead of a component.

Using NgModule which is not needed for standalone bootstrapping.

The bootstrapApplication function takes the standalone component to start the app. Here, AppComponent is the standalone component.

2fill in blank

medium

Complete the code to add a provider when bootstrapping a standalone component.

Angular

bootstrapApplication(AppComponent, {
  providers: [[1]]
});

Drag options to blanks, or click blank then click option'

A{ provide: HTTP_INTERCEPTORS, useClass: AuthInterceptor, multi: true }

BHttpClientModule

CRouterModule

DNgModule

Attempts:

3 left

💡 Hint

Common Mistakes

Adding modules instead of providers.

Passing a module like HttpClientModule directly in providers.

Providers are added as objects describing the service. Here, an HTTP interceptor is provided correctly.

3fill in blank

hard

Fix the error in bootstrapping by completing the missing import.

Angular

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { importProvidersFrom } from '@angular/core';
import { [1] } from '@angular/common/http';

bootstrapApplication(AppComponent, {
  providers: [importProvidersFrom(HttpClientModule)]
});

Drag options to blanks, or click blank then click option'

AHttpClientModule

BHttpClient

CHttpHandler

DHttpInterceptor

Attempts:

3 left

💡 Hint

Common Mistakes

Importing HttpClient instead of HttpClientModule.

Forgetting to import the module before adding it to providers.

The HttpClientModule must be imported from @angular/common/http and used with importProvidersFrom to provide HTTP services in standalone bootstrapping.

4fill in blank

hard

Complete the blank to correctly bootstrap a standalone component with routing.

Angular

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { [1] } from '@angular/router';

bootstrapApplication(AppComponent, {
  providers: [[1]([])]
});

Drag options to blanks, or click blank then click option'

ARouterModule

BimportProvidersFrom

CprovideRouter

DRoutes

Attempts:

3 left

💡 Hint

Common Mistakes

Using RouterModule directly in providers without wrapping.

Confusing Routes type with provider functions.

To add routing providers in standalone bootstrapping, import and use provideRouter([]) in the providers array.

5fill in blank

hard

Fill all three blanks to bootstrap a standalone component with HTTP and routing providers.

Angular

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { [1] } from '@angular/common/http';
import { [2] } from '@angular/router';
import { [3] } from '@angular/core';

bootstrapApplication(AppComponent, {
  providers: [
    importProvidersFrom(HttpClientModule),
    provideRouter([])
  ]
});

Drag options to blanks, or click blank then click option'

AHttpClientModule

BprovideRouter

CimportProvidersFrom

DRouterModule

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up RouterModule with provideRouter.

Forgetting to import HttpClientModule.

Import HttpClientModule for HTTP, and provideRouter and importProvidersFrom for routing providers.

Practice

1. What is the main purpose of using bootstrapApplication in Angular with standalone components?

easy

A. To start the Angular app using a standalone component as the root

B. To create a new Angular module automatically

C. To register services globally without components

D. To enable lazy loading of modules

Solution

1. Step 1: Understand Angular bootstrapping

   Bootstrapping means starting the Angular app by telling it which component to load first.

2. Step 2: Role of bootstrapApplication

   This function starts the app with a standalone component directly, without needing a module.

3. Final Answer:

   To start the Angular app using a standalone component as the root -> Option A

4. Quick Check:

   Bootstrapping = start app with standalone component [OK]

Hint: Remember: bootstrapApplication starts app with standalone root [OK]

Common Mistakes:

• Confusing bootstrapApplication with module creation
• Thinking it registers services globally
• Assuming it enables lazy loading

2. Which of the following is the correct syntax to bootstrap an Angular app with a standalone component named AppComponent?

easy

A. bootstrapModule(AppComponent);

B. bootstrapApplication(AppComponent);

C. bootstrap(AppComponent);

D. bootstrapStandalone(AppComponent);

Solution

1. Step 1: Identify the correct bootstrap function

   Angular uses bootstrapApplication to start apps with standalone components.

2. Step 2: Match the syntax

   The correct call is bootstrapApplication(AppComponent); to bootstrap the standalone component.

3. Final Answer:

   bootstrapApplication(AppComponent); -> Option B

4. Quick Check:

   Use bootstrapApplication for standalone components [OK]

Hint: Use bootstrapApplication, not bootstrapModule, for standalone [OK]

Common Mistakes:

• Using bootstrapModule which is for NgModules
• Using non-existent bootstrapStandalone function
• Using just bootstrap which is invalid

3. Given this code snippet, what will be the output in the browser?

import { bootstrapApplication } from '@angular/platform-browser';
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  standalone: true,
  template: `
Hello Angular!
`
})
export class AppComponent {}

bootstrapApplication(AppComponent);

medium

A. The page displays the text 'app-root' literally

B. The page is blank with no content

C. The page displays 'Hello Angular!' inside an <h1> tag

D. A runtime error occurs due to missing NgModule

Solution

1. Step 1: Analyze the component template

   The AppComponent has a template with <h1>Hello Angular!</h1>.

2. Step 2: Understand bootstrapping with standalone

   Using bootstrapApplication with a standalone component renders its template as the root content.

3. Final Answer:

   The page displays 'Hello Angular!' inside an <h1> tag -> Option C

4. Quick Check:

   Standalone bootstrap renders component template [OK]

Hint: Standalone bootstrap renders component template as root [OK]

Common Mistakes:

• Expecting a blank page without root module
• Thinking NgModule is required for rendering
• Confusing selector text with rendered content

4. Identify the error in this Angular bootstrapping code:

import { bootstrapApplication } from '@angular/platform-browser';
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  template: `
Welcome!
`
})
export class AppComponent {}

bootstrapApplication(AppComponent);

medium

A. Missing 'standalone: true' in the component decorator

B. Incorrect import path for bootstrapApplication

C. Missing bootstrapModule call instead of bootstrapApplication

D. Component selector should be 'app-root' in bootstrapApplication

Solution

1. Step 1: Check component decorator for standalone flag

   The component lacks standalone: true, which is required for standalone bootstrapping.

2. Step 2: Understand bootstrapApplication requirements

   Only standalone components can be bootstrapped with bootstrapApplication.

3. Final Answer:

   Missing 'standalone: true' in the component decorator -> Option A

4. Quick Check:

   Standalone flag required for bootstrapApplication [OK]

Hint: Add standalone: true to component for bootstrapApplication [OK]

Common Mistakes:

• Forgetting standalone: true in component
• Using bootstrapModule with standalone component
• Confusing selector name with bootstrapping method

5. You want to bootstrap an Angular app with a standalone component that uses a service. Which is the correct way to provide the service during bootstrapping?

hard

A. Inject the service directly in main.ts without providers

B. Pass the service in the providers array inside the component decorator only

C. Declare the service in an NgModule and bootstrap with bootstrapModule

D. Pass the service in the providers option of bootstrapApplication call

Solution

1. Step 1: Understand service provision with standalone bootstrap

   When bootstrapping standalone components, you can provide services via the providers option in bootstrapApplication.

2. Step 2: Compare options

   Providing services only in the component decorator limits scope; providing in bootstrapApplication makes them app-wide.

3. Final Answer:

   Pass the service in the providers option of bootstrapApplication call -> Option D

4. Quick Check:

   Use providers in bootstrapApplication for app-wide services [OK]

Hint: Use providers option in bootstrapApplication for services [OK]

Common Mistakes:

• Providing services only in component decorator limits scope
• Using NgModule approach with standalone bootstrap
• Injecting services without providers causes errors