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I understand the basics of Rx. Where I'm struggling is how you would actually use this beyond academic examples? What are some common, simple real-world scenarios where Rx is a much better solution than what we have today in .NET?
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It calculates the total and pushes the result to stream c. If, for example, c is also connected to some other stream from some other operation (e.g. multiplier), in that case, even multiplier operation would get invoked automatically. Thus, we can see that, in reactive programming, we do not invoke functions.
Basically, Rx is a library for composing asynchronous and event-based programs using observable collections. This is very useful in the case wherein you are pulling data asynchronously from different sources and then manipulating the same and finally printing the result.
Rx.NET: (this repository) The Reactive Extensions (Rx) is a library for composing asynchronous and event-based programs using observable sequences and LINQ-style query operators.
For a bunch of good examples, see the 101 Rx Samples wiki
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Rx allows you to write code that orchestrates concurrent events together. If you've ever used the TPL (i.e. Task), then had to do convoluted backflips to try to ContinueWith or WaitAll on the right things, Rx is for you.
For example, the workflow of "For each item in this array, call a web service, and when all of those requests come back, do something else. If any one of them fail, fail the whole thing".
Disclosure, Shameless plug ahead: The book that Jesse Liberty and I wrote about Rx was designed to solve exactly this question, "How do I use Rx in my day-to-day work?"; "What can I do with this?"
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