[SpaceCadetJones]

In a nutshell:

- Functional programming style tends to make your programs easier to reason about, as it avoids state/mutation. This also makes testing your programs much easier, and can also make concurrency easier.

- It's a different way of thinking. Some problems are much easier to solve in a functional fashion, some are much easier in a imperative fashion.

- Functional code can increase code re-usability as it decouples data from its operations

- A lot of functional languages have very advanced type systems compared to say, Java or C++. I'm personally a big fan of static typing and after learning F# I am sorely missing its type system in C#