[Solved] Consider this Angular service:@Injectable({ providedIn: 'root' })... } }If two components inject this service and each calls registerClick() once, what will be the value of clicks in the service? | Angular

Angular - Services and Dependency Injection

Consider this Angular service:

@Injectable({ providedIn: 'root' })
export class ClickService {
  clicks = 0;
  registerClick() { this.clicks++; }
}

If two components inject this service and each calls registerClick() once, what will be the value of clicks in the service?

A1

B2

C0

DUndefined, because each component has its own instance

Step-by-Step Solution

Solution:

Step 1: Service providedIn root is singleton
Both components share the same instance of ClickService.
Step 2: Each call increments the same clicks property
Two calls total increment clicks from 0 to 2.
Final Answer:
2 -> Option B
Quick Check:
Singleton service shares state across components [OK]

Quick Trick: Singleton service state accumulates across components [OK]

Common Mistakes:

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