As discussed earlier, we know that Rx is all about working with Observable sequences; the way you work with them is by using one or more operators on them. Operators are methods of the various observable types as discussed earlier.
Marble diagrams are interactive diagrams that depict how Rx operators work with observable sequences. Consider this example:
You can visit RxMarbles.com to view and play around with marble diagrams for most Rx operators that you will find in RxSwift. For instance, from the preceding marble diagram, you can see how a map operator works.
The elements in the top line represent elements emitted from ...
