Transformation Operators
Explore how Angular's transformation operators, mergeMap and switchMap, manipulate observable streams to handle complex data flows efficiently. Understand their differences and practical use cases to create responsive applications that manage multiple data sources. This lesson guides you through building pipelines with these operators and using helpful tools like the RxJS Operator Decision Tree.
What are the transformation operators?
These operators help in transforming the source of an Observable.
mergeMap() operator
The mergeMap() operator allows us to take each value emitted by a source Observable, convert it into an inner Observable, and merge the emissions from those inner Observables into one output Observable. Why would this be useful? Well, if we have an application that retrieves book IDs from one API and then fetches details for each book from another API, we can use mergeMap() to handle those requests and merge their responses into one data stream.
Example
Let’s have a look at how this ...