Angular Signals (signal, computed, effect)
As a Fresher engineer, explain Angular Signals (signal, computed, effect). What problem does it solve and how would you describe it in an interview?
Answers use simple, clear English.
Quick interview answer
At Fresher depth: start with the problem, then mechanism, then a short example. Signals are reactive primitives: signal() writable, computed() derived, effect() side effects.
Detailed answer
At Fresher depth: start with the problem, then mechanism, then a short example. Signals are reactive primitives: signal() writable, computed() derived, effect() side effects. Fine-grained updates reduce reliance on Zone.js change detection for many cases. Core: Signals are reactive primitives: signal() writable, computed() derived, effect() side effects. Fine-grained updates reduce reliance on Zone.js change detection for many cases. Real-time example: cartCount = computed(() => items().reduce(...)); template reads cartCount(). Pros: Predictable reactivity; better performance mental model. Cons: Migration from RxJS-heavy patterns takes learning. Common mistakes: Writing to signals inside computed; infinite effect loops. Best practices: Prefer signals for local UI state; RxJS for async streams still fine. Audience level: Fresher.
Full explanation
Signals are reactive primitives: signal() writable, computed() derived, effect() side effects. Fine-grained updates reduce reliance on Zone.js change detection for many cases.
Real example & use case
cartCount = computed(() => items().reduce(...)); template reads cartCount().
Pros & cons
Pros: Predictable reactivity; better performance mental model. Cons: Migration from RxJS-heavy patterns takes learning.
Common mistakes
Writing to signals inside computed; infinite effect loops.
Best practices
Prefer signals for local UI state; RxJS for async streams still fine.
Follow-up questions
- How would you test Angular Signals (signal, computed, effect)?
- What metrics prove Angular Signals (signal, computed, effect) is healthy in prod?
- How does Angular Signals (signal, computed, effect) change at 10× traffic?