Functional programming had crossed paths with C# years ago, adding a lot to the language's specification. We have functional sequences with LINQ, built on top of list comprehension. There are lambdas and closures, support for tuples, records, and pattern matching. We can build our own functional extensions. Yet, some crucial parts are still missing. Common functional types, such as Option and Either are not available and there is no supporting syntax. Discriminated unions are still but a distant dream.
In this presentation, you will learn how you can build your own substitutes for the missing concepts without having to step back to the traditional imperative coding style. The goal of the game: Stay within C#, keep thinking functionally, and don't worry too much about missing types or syntax.

This talk was presented at conferences a few years back. The current state of this talk is mostly the evolution of introductory demos available on my YouTube channel: https://www.youtube.com/playlist?list=PLSDYwLgFqaX78eEg_YKs0wHmOMi7_ggZr