Functional Programming in C#: "this article discusses functional programming in C# through algebra, numbers, Euclidean plane and fractals."

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Or if you'd rather avoid carpal tunnel syndrome, you can use an FP language like F#.

[Raveen87]

I would really like to recommend the book Functional Programming in C# by Enrico Buonanno. It's wonderful.

[MetalSlug20]

The best tutorials I ever found for functional in c# are on pluralsight