Piggybacking off your comment, I just completed a detailed research paper where I compared Haskell to C# with an automated trading strategy. I have many years of OOP and automated trading experience, but struggled a bit at first implementing in Haskell syntax. I attempted to stay away from LLMs, but ended up using them here and there to get the syntax right.

Haskell is actually a pretty fun language, although it doesn't fly off my fingers like C# or C++ does. I think a really great example of the differences is displayed in the recursive Fibonacci sequence.

In C#:

    public int Fib(int n)
    {
        if (n <= 1)
            return n;
        else
            return Fib(n - 1) + Fib(n - 2);
    }

    fib :: Integer -> Integer
    fib n
      | n <= 1    = n
      | otherwise = fib (n - 1) + fib (n - 2)

When using switch expression in C#, they are a lot more similar:

    public int Fib(int n) => n switch
    {
        <= 1 => n,
        _    => Fib(n - 1) + Fib(n - 2)
    };