[Solved] Identify the error in this resolver code:export class ProductResolver implements Resolve<Product> { constructor(private productService: ProductService) {} resolve(route: ActivatedRouteSnapshot):... | Angular

Angular - Advanced Patterns

Identify the error in this resolver code:

export class ProductResolver implements Resolve<Product> {
  constructor(private productService: ProductService) {}
  resolve(route: ActivatedRouteSnapshot): Product {
    const id = route.paramMap.get('id')!;
    this.productService.getProduct(id).subscribe(product => {
      return product;
    });
  }
}

AThe resolve method returns void instead of Product or Observable<Product>

BThe subscribe method is missing a callback function

CThe constructor is missing dependency injection

DThe route parameter 'id' is not accessed correctly

Step-by-Step Solution

Solution:

Step 1: Check resolve method return type
The resolve method declares it returns Product but actually returns nothing because subscribe is asynchronous and returns void.
Step 2: Understand correct return for resolver
Resolvers must return Observable or Promise, not void. Using subscribe inside resolve breaks this contract.
Final Answer:
The resolve method returns void instead of Product or Observable -> Option A
Quick Check:
Resolvers must return Observable or Promise, not void [OK]

Quick Trick: Never subscribe inside resolve; return Observable or Promise directly [OK]

Common Mistakes:

Using subscribe inside resolve instead of returning Observable
Returning wrong data type from resolve
Ignoring asynchronous nature of data fetching

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More Angular Quizzes

Identify the error in this resolver code:

Step 1: Check resolve method return type

Step 2: Understand correct return for resolver

Final Answer:

Quick Check:

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