concatMap
Introduction
Section titled “Introduction”concatMap queues inner Observables and processes them one at a time, waiting for each to complete before starting the next.
Example
Section titled “Example”actions$.pipe( concatMap(action => this.processAction(action)) // Strictly sequential).subscribe();When to Use
Section titled “When to Use”- Sequential file uploads
- Ordered form submissions
- Any scenario requiring order preservation
Summary
Section titled “Summary”concatMap guarantees sequential processing order.”