Async Patterns & Pitfalls

Pitfall: Forgetting to await

Fix the Missing await

Pitfall: Unnecessary Sequential Awaits

Replace Sequential awaits With Promise.all

Pitfall: Swallowed Errors

Fix a Swallowed Error

Pitfall: async Callbacks in Array Methods

Fix an async Callback Inside forEach

Use map and Promise.all for Concurrent Processing

Pitfalls Check

Pitfall: Wrapping Promises in new Promise Unnecessarily

Remove Unnecessary Promise Wrapping

Pitfall: Promise.all Failing Silently

Add Error Handling to Promise.all

Pattern: Retrying Failed Operations

Implement a Retry Wrapper

Pattern: Deduplicating In-Flight Requests

Deduplicate Concurrent Requests for the Same Resource

Lesson 16 Review