Combining observables

The operators listed here combine several source observables into a single observable. Some of them have already been covered in the previous chapters. They are the following:

Operator	Description	Chapter
combine_latest	Emits an item that is the combination of the source observable and the last item emitted from another observable	8
merge	Emits items from several observables as they arrive	3
start_with	Emits an item as the first item of the observable	8

The join operator

The join operator combines the items emitted by two observables when they are emitted within a specified time window. The join operator is very similar to the combine_latest operator, but with additional time constraints...