You have nested batch requests where each batch fetches a list of IDs, then fetches details for each ID asynchronously. How should you structure the code?

hard📝 Application Q9 of 15

Rest API - Batch and Bulk Operations

AUse nested for loops with await inside each loop without Promise.all.

BUse Promise.all for the outer batch, then inside map over IDs with another Promise.all for details.

CCombine all IDs into one request and fetch details in a single call.

DFetch all IDs first synchronously, then fetch details one by one.

Step-by-Step Solution

Solution:

Step 1: Understand nested async batch needs
Outer batch fetches lists; inner batch fetches details for each list asynchronously.
Step 2: Use Promise.all for both levels
Promise.all at both levels allows parallel fetching efficiently.
Final Answer:
Use Promise.all for the outer batch, then inside map over IDs with another Promise.all for details. -> Option B
Quick Check:
Nested Promise.all handles nested async batches [OK]

Quick Trick: Use nested Promise.all for nested async batches [OK]

Common Mistakes:

MISTAKES

Fetching details synchronously slowing performance
Trying to combine all IDs in one request without API support
Using nested loops without Promise.all causing sequential waits

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More Rest API Quizzes

You have nested batch requests where each batch fetches a list of IDs, then fetches details for each ID asynchronously. How should you structure the code?

Step 1: Understand nested async batch needs

Step 2: Use Promise.all for both levels

Final Answer:

Quick Check:

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