Subscribes to an additional publisher and invokes a closure upon receiving output from either publisher.
- iOS 13.0+
- macOS 10.15+
- Mac Catalyst 13.0+
- tvOS 13.0+
- watchOS 6.0+
- Xcode 11.0+
Another publisher to combine with this one.
A closure that receives the most recent value from each publisher and returns a new value to publish.
A publisher that receives and combines elements from this and another publisher.