You want to create an interceptor that adds a timestamp to every response object. Which code snippet correctly implements this?

hard📝 component behavior Q8 of 15

NestJS - Interceptors

Aintercept(context, next) { return next.handle().pipe(map(data => ({ ...data, timestamp: Date.now() }))); }

Bintercept(context, next) { return next.handle().pipe(filter(data => data.timestamp = Date.now())); }

Cintercept(context, next) { return next.handle().pipe(map(data => data.timestamp = Date.now())); }

Dintercept(context, next) { return next.handle().pipe(reduce((acc, data) => ({ ...acc, timestamp: Date.now() }))); }

Step-by-Step Solution

Solution:

Step 1: Identify correct RxJS operator for transformation
map is used to transform each emitted value by adding timestamp.
Step 2: Verify correct object spreading and timestamp addition
intercept(context, next) { return next.handle().pipe(map(data => ({ ...data, timestamp: Date.now() }))); } spreads original data and adds timestamp property correctly.
Final Answer:
Use map with object spread and timestamp property -> Option A
Quick Check:
map + spread + timestamp = intercept(context, next) { return next.handle().pipe(map(data => ({ ...data, timestamp: Date.now() }))); } [OK]

Quick Trick: Use map and spread operator to add properties safely [OK]

Common Mistakes:

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