Angular 21 - Questions & Explanation(20/3/2026)

Angular 21 - Questions & Explanation

🚀 Angular 21 - Questions, Answers & Diagrams

Q1: What are Signals in Angular 21?

Answer: Signals are a new reactive way to manage state without RxJS.

count = signal(0); count.update(v => v + 1);
flowchart LR User --> UpdateSignal --> UIUpdate

Q2: What is Zoneless Change Detection?

Answer: Angular 21 removes dependency on zone.js for better performance.

flowchart TD UserAction --> SignalChange --> UIRefresh

Q3: What are Signal Forms?

Answer: New way to handle forms using signals instead of reactive forms.

name = signal('');
flowchart LR Input --> Signal --> UI

Q4: What are Computed Signals?

Answer: Derived values that auto-update when base signal changes.

total = computed(() => price() + tax());
flowchart LR Price --> Compute --> Total Tax --> Compute

Q5: What are Standalone Components?

Answer: Components without NgModules.

@Component({ standalone: true })
flowchart TD App --> Component

Q6: What is Vitest in Angular 21?

Answer: Faster testing framework replacing older tools.

flowchart LR Test --> Execute --> FastResult

Q7: What is Angular Aria?

Answer: Accessibility support for building inclusive apps.

flowchart LR UI --> Accessibility --> UserExperience

Q8: What are AI Developer Tools?

Answer: AI helps in code generation, debugging, and suggestions.

flowchart LR Developer --> AI --> CodeSuggestion

Q9: What is HttpClient Default Setup?

Answer: HTTP services available without extra configuration.

this.http.get('/api/data')
flowchart LR App --> API --> Response

Q10: What are Faster Builds?

Answer: Improved CLI with optimized build speed.

flowchart LR Code --> Build --> OptimizedApp

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