Angular — Complete Tutorial

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

<h2>{{ title }}</h2>
<button (click)="inc()">+</button>

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

@Component({
  selector: 'app-root',
  template: `<h1>{{ title }}</h1>`,
})
export class AppComponent { title = 'Hello'; }

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

{{ value }}
[disabled]="isDisabled"
(click)="doThing()"
[(ngModel)]="name"

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Services share logic/data across components (API calls, state, utilities).

• 1Creating services without a clear responsibility.

• 1Inject services instead of duplicating logic in components.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

*ngIf="ok"
*ngFor="let x of items"

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Services share logic/data across components (API calls, state, utilities).

• 1Creating services without a clear responsibility.

• 1Inject services instead of duplicating logic in components.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

@Injectable({ providedIn: 'root' })
export class ApiService {}
constructor(private api: ApiService) {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Services share logic/data across components (API calls, state, utilities).

• 1Creating services without a clear responsibility.

• 1Inject services instead of duplicating logic in components.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

this.form = new FormGroup({ name: new FormControl('') })
<form [formGroup]="form"></form>

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

RouterModule.forRoot([{ path: 'home', component: HomeComponent }])
<router-outlet></router-outlet>

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Routing powers multi-page SPA navigation and lazy-loaded features.

• 1Putting business logic inside route components.

• 1Use feature modules / standalone routes and keep routes centralized.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

@Injectable({ providedIn: 'root' })
export class ApiService {}
constructor(private api: ApiService) {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Services share logic/data across components (API calls, state, utilities).

• 1Creating services without a clear responsibility.

• 1Inject services instead of duplicating logic in components.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

this.http.get('/api/users').subscribe(users => this.users = users);

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1HttpClient connects Angular apps to REST/GraphQL backends.

• 1Not handling error states and loading UI.

• 1Centralize headers/auth with interceptors and handle errors consistently.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

{{ price | currency:'USD' }}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

*ngIf="ok"
*ngFor="let x of items"

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

const count = signal(0);
const doubled = computed(() => count() * 2);

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Signals + OnPush help build fast UIs with predictable updates.

• 1Mutating objects in place and expecting UI to update.

• 1Prefer immutable updates and use the async pipe or signals patterns.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

ChangeDetectionStrategy.OnPush

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Signals + OnPush help build fast UIs with predictable updates.

• 1Mutating objects in place and expecting UI to update.

• 1Prefer immutable updates and use the async pipe or signals patterns.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

@Injectable({ providedIn: 'root' })
export class ApiService {}
constructor(private api: ApiService) {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Services share logic/data across components (API calls, state, utilities).

• 1Creating services without a clear responsibility.

• 1Inject services instead of duplicating logic in components.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

RouterModule.forRoot([{ path: 'home', component: HomeComponent }])
<router-outlet></router-outlet>

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Routing powers multi-page SPA navigation and lazy-loaded features.

• 1Putting business logic inside route components.

• 1Use feature modules / standalone routes and keep routes centralized.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

this.http.get('/api/users').subscribe(users => this.users = users);

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1HttpClient connects Angular apps to REST/GraphQL backends.

• 1Not handling error states and loading UI.

• 1Centralize headers/auth with interceptors and handle errors consistently.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

this.form = new FormGroup({ name: new FormControl('') })
<form [formGroup]="form"></form>

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

// Angular pattern
@Component({...})
export class C {}

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

trigger('fade', [ transition(':enter', [ style({opacity:0}), animate('200ms') ]) ])

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

it('renders', () => { /* TestBed + fixture */ });

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Angular is used for large, maintainable front-end apps in teams.

• 1Trying to learn everything at once (start with components + templates + binding).

• 1Use TypeScript types, keep components focused, and move logic into services.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

DomSanitizer
HttpInterceptor (auth headers)

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1Security matters for auth flows, admin dashboards, and forms.

• 1Disabling sanitization without understanding XSS risks.

• 1Validate inputs and avoid bypassing Angular sanitization unless necessary.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):

ng add @angular/ssr
provideClientHydration()

Edit the Angular example below and click Run. The output panel shows the extracted Expected Output notes.

• 1SSR improves SEO and first paint for content-heavy pages.

• 1Using browser-only APIs in server-rendered code.

• 1Guard browser APIs and test SSR paths early.

• 1Practice by editing the example and checking the expected output.
• 2Keep components clean; push logic to services and reusable utilities.

• 1Change the example title/value.
• 2Add one edge case and decide how UI should behave.
• 3Write 1 sentence explaining the pattern.

Keywords (topic intent):